Maurizio BROCCHINI

Pubblicazioni

Maurizio BROCCHINI

 

279 pubblicazioni classificate nel seguente modo:

Nr. doc. Classificazioni
133 4 Contributo in Atti di Convegno (Proceeding)
131 1 Contributo su Rivista
13 2 Contributo in Volume
2 3 Libro
Anno
Risorse
2021
Effects of stiffness and configuration of brace-viscous damper systems on the response mitigation of offshore jacket platforms
APPLIED OCEAN RESEARCH
Autore/i: Vaezi, M.; Pourzangbar, A.; Fadavi, M.; Mousavi, S. M.; Sabbahfar, P.; Brocchini, M.
Classificazione: 1 Contributo su Rivista
Abstract: We investigate the effects of a brace-viscous damper system on the dynamic response of offshore platforms. To do this, offshore jacket platforms with various distributions and three different configurations of brace-viscous damper systems - toggle, chevron, and diagonal configurations - and a wide range of brace stiffness are numerically modelled under the loading of irregular waves in ANSYS software. The dynamic response of the developed numerical model and its various brace-viscous damper configurations are validated against literature experimental and numerical results. Such a validation revealed an excellent agreement between the numerical results and the benchmark data. The results suggest that the standard deviation of the platform displacement given by a toggle configuration is less than that due to the chevron and diagonal configurations. Moreover, the maximum reduction of the base shear force is achieved by the application of the toggle configuration. Regarding the brace stiffness (area), for a reference damping coefficient of 500 N.m/s, a 54% increase in the brace area (from 42 to 91.8 mm2) results in a 21.26%, 38.61%, and 17.57% reduction in the structure displacement response for the diagonal, chevron, and toggle configurations, respectively. Using the results of the numerical simulations, we propose the spatially-optimized distribution of the brace-viscous damper system. Comparing the numerical results of this paper with those of field observations it was shown that the viscous damper with toggle configuration outperforms both the viscoelastic damper and uncontrolled platforms in terms of dynamic response.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/287980 Collegamento a IRIS

2021
Preliminary results on the dynamics of a pile-moored fish cage with elastic net in currents and waves
JOURNAL OF MARINE SCIENCE AND ENGINEERING
Autore/i: Zitti, G.; Novelli, N.; Brocchini, M.
Classificazione: 1 Contributo su Rivista
Abstract: Over the last decades, the aquaculture sector increased significantly and constantly, mov-ing fish-farm plants further from the coast, and exposing them to increasingly high forces due to currents and waves. The performances of cages in currents and waves have been widely studied in literature, by means of laboratory experiments and numerical models, but virtually all the research is focused on the global performances of the system, i.e., on the maximum displacement, the volume reduction or the mooring tension. In this work we propose a numerical model, derived from the net-truss model of Kristiansen and Faltinsen (2012), to study the dynamics of fish farm cages in current and waves. In this model the net is modeled with straight trusses connecting nodes, where the mass of the net is concentrated at the nodes. The deformation of the net is evaluated solving the equation of motion of the nodes, subjected to gravity, buoyancy, lift, and drag forces. With respect to the original model, the elasticity of the net is included. In this work the real size of the net is used for the computation mesh grid, this allowing the numerical model to reproduce the exact dynamics of the cage. The numerical model is used to simulate a cage with fixed rings, based on the concept of mooring the cage to the foundation of no longer functioning offshore structures. The defor-mations of the system subjected to currents and waves are studied.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/287981 Collegamento a IRIS

2021
Initial investigation of athletes’ electrocardiograms acquired by wearable sensors during the pre-exercise phase
THE OPEN BIOMEDICAL ENGINEERING JOURNAL
Autore/i: Romagnoli, S.; Sbrollini, A.; Colaneri, M.; Marcantoni, I.; Morettini, M.; Zitti, G.; Brocchini, M.; Pozzi, M.; Burattini, L.
Classificazione: 1 Contributo su Rivista
Abstract: Aim: The aim of this study is to support large-scale prevention programs fighting sport-related sudden cardiac death by providing a set of electrocardiographic features representing a starting point in the development of normal reference values for the pre-exercise phase. Background: In people with underlying, often unknown, cardiovascular abnormalities, increased cardiovascular load during exercise can trigger sport-related sudden cardiac death. Prevention remains the only weapon to contrast sport-related sudden cardiac death. So far, no reference values have been proposed for electrocardiograms of athletes acquired with wearable sensors in the pre-exercise phase, consisting of the few minutes immediately before the beginning of the training session. Objective: To perform an initial investigation of athletes’ electrocardiograms acquired by wearable sensors during the pre-exercise phase. Methods: The analyzed electrocardiograms, acquired through BioHarness 3.0 by Zephyr, belong to 51 athletes (Sport Database and Cycling Database of the Cardiovascular Bioengineering Lab of the Università Politecnica delle Marche, Italy). Preliminary values consist of interquartile ranges of six electrocardiographic features which are heart rate, heart-rate variability, QRS duration, ST level, QT interval, and corrected QT interval. Results: For athletes 35 years old or younger, preliminary values were [72;91]bpm, [26;47]ms, [85;104]ms, [-0.08;0.08]mm, [326;364]ms and [378;422]ms, respectively. For athletes older than 35 years old, preliminary values were [71;94]bpm, [16;65]ms, [85;100]ms, [-0.11;0.07]mm, [330;368]ms and [394;414]ms, respectively. Conclusion: Availability of preliminary reference values could help identify those athletes who, due to electrocardiographic features out of normal ranges, are more likely to develop cardiac complications that may lead to sport-related sudden cardiac death.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/291630 Collegamento a IRIS

2021
Wave-Forced Dynamics at Microtidal River Mouths
River Deltas - Recent Advances
Autore/i: Brocchini, Maurizio; Postacchini, Matteo; Melito, Lorenzo; Perugini, Eleonora; Manning, Andrew J.; Smith, Joseph P.; Calantoni, Joseph
Editore: IntechOpen
Classificazione: 2 Contributo in Volume
Abstract: Microtidal river mouths are dynamic environments that evolve as a consequence of many forcing actions. Under the hydrodynamic viewpoint, river currents, sea waves and tides strongly interact, and their interplay determines specific sediment transport and morphological patterns. Beyond literature evidence, information comes from field observations made at the Misa River study site, a microtidal river along the Adriatic Sea (Italy), object of a long-going monitoring. The river runs for 48 km in a watershed of 383 km2, providing a discharge of about 400 m3/s for return periods of 100 years. The overall hydrodynamics, sediment transport and morphological evolution at the estuary are analyzed with particular attention to specific issues like: the generation of vortical flows at the river mouth, the influence of various wave modes (infragravity to tidal) propagating upriver, the role of sediment flocculation, the generation and evolution of bed features (river-mouth bars and longitudinal nearshore bars). Numerical simulations are also used to clarify specific mechanisms of interest.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/291760 Collegamento a IRIS

2020
Wave-induced vortex generation around a slender vertical cylinder
PHYSICS OF FLUIDS
Autore/i: Antolloni, Giulia; Jensen, Atle; Grue, John; Riise, Bjørn H.; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: Experimental results of wave-induced vortex generation around a slender, vertical cylinder are discussed. Coherent vortices appear in long waves (kR = 0.1) (k wavenumber, R cylinder radius) during the timing of the secondary load cycle, a strongly nonlinear component of the wave force acting on the cylinder, which is also measured. The secondary load cycle is present also in moderately long wave cases (kR = 0.3), where, however, there is no vortex formation. The measurement of vortex generation is enabled by Particle Image Velocimetry. The flow downstream the cylinder, in three horizontal planes at different depths is measured. The vortex formation that occurs in the long waves is attached to the cylinder in the form of thin vortex tubes. These appear symmetrically at angles of 40-45 degrees off the wave propagation direction. In one weak long wave case several very thin vortex tubes appear along the back side of the cylinder. Vortex diameters are 20 % of the cylinder diameter in four cases and 50 % of the cylinder diameter in one case. The measured vorticity emanates from the cylinder's boundary layer and is an order of magnitude stronger than to the vorticity caused by wave breaking. Wave breaking reduces the vortex strength. The fact that the secondary load cycle appears without and with flow separation effects indicates that the load cycle is a gravity wave phenomenon that scales with the Froude number, but that flow separation effects also contribute to the magnitude of such suction force.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/277101 Collegamento a IRIS

2020
An analytical description of the energy balance in turbulent, round, free jets
AIP ADVANCES
Autore/i: Brocchini, M.
Classificazione: 1 Contributo su Rivista
Abstract: This brief contribution provides a quantification of the terms of the turbulent kinetic energy transport equation for a round steady turbulent free jet. The analysis is based on the assumption of flow self-similarity, and it is performed by means of a simple analytical asymptotic analysis. The results are in good agreement with the experimental findings of Panchapakesan and Lumley [J. Fluid Mech. 246, 197-223 (1993)] and with the large eddy simulations of Bogey and Bailly [J. Fluid Mech. 627, 129-160 (2009)], hence providing a theoretical interpretation of such findings.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/287979 Collegamento a IRIS

2020
Wave-resolving shoreline boundary conditions for wave-averaged coastal models
OCEAN MODELLING
Autore/i: Memmola, F.; Coluccelli, A.; Russo, A.; Warner, J. C.; Brocchini, M.
Classificazione: 1 Contributo su Rivista
Abstract: Downscaling broadscale ocean model information to resolve the fine-scale swash-zone dynamics has a number of applications, such as improved resolution of coastal flood hazard drivers, modeling of sediment transport and seabed morphological evolution. A new method is presented, which enables wave-averaged models for the nearshore circulation to include short-wave induced swash zone dynamics that evolve at the wave group scale (i.e. averaged over the short waves). Such dynamics, which cannot be described, by construction through wave-averaged models, play a fundamental role in nearshore hydrodynamics and morphodynamics. The method is based on the implementation of a set of Shoreline Boundary Conditions (SBCs) in wave-averaged models. The chosen set of SBCs allows for proper computation of the short-wave properties at a mean shoreline (xl) taken as the envelope of the actual shoreline. The suitability of the approach is assessed through implementation of the SBCs into the Regional Ocean Modeling System (ROMS) coupled to a spectral wave model (InWave for IG waves and SWAN for wind waves). As the aim is to assess the viability of the approach, the SBCs are implemented only through a one-way coupling to ROMS (i.e. ROMS forcing the SBCs). Four different test cases – with constant, periodic and bichromatic offshore forcing – are run to assess the model performances. The main results of the analysis are: (a) the proposed SBCs can well reproduce the shoreline motion and swash zone dynamics in there for all chosen tests (RMSE and BIAS less than 20 % up to a cross-shore resolution of 4.0m (L0∕3 or L0∕5)) and (b) implementation of the SBCs allows ROMS to accurately simulate the swash zone flows even at a resolution 40 times coarser than that needed by ROMS with its own wet–dry routine to properly describe the same flows. The latter result clearly demonstrates the major computational advantage of using the proposed SBCs. We also show that most of the swash zone dynamics is due to the mean flow (i.e. incoming Riemann variable) and the local (at xl) wave height. However, especially in the case of bichromatic waves, the swash zone water volume content also seems to play a crucial role.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/287978 Collegamento a IRIS

2020
Efficiency evaluation of a ductless Archimedes turbine: Laboratory experiments and numerical simulations
RENEWABLE ENERGY
Autore/i: Zitti, G.; Fattore, F.; Brunori, A.; Brunori, B.; Brocchini, M.
Classificazione: 1 Contributo su Rivista
Abstract: The aim of designing a new hydrokinetic turbine simple, cheap, environmentally friendly and suitable for installation in remote areas is pursued by studying the efficiency of an Archimedes turbine that exploits the kinetic energy of a water stream rather than an upstream-downstream difference in water head. First, the efficiency of a hydrokinetic Archimedes turbine has been studied using laboratory experiments for low TSR regimes. Subsequently, numerical simulations have been run to evaluate the performance coefficient of the turbine only (without frictional losses or blockage augmentation), and to extend the TSR range. Numerical simulations have allowed to produce the efficiency curve of the hydrokinetic Archimedes turbine in both aligned and inclined configurations. The obtained maximum performance coefficients have been compared with those of other hydrokinetic turbines currently in use and inspected through a parametric analysis dedicated to explore the practical applications of the proposed turbine.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/273202 Collegamento a IRIS

2020
Novel free surface boundary conditions for spilling breaking waves
COASTAL ENGINEERING
Autore/i: Iravani, N.; Badiei, P.; Brocchini, M.
Classificazione: 1 Contributo su Rivista
Abstract: The breaking of gravity water waves induces both strong turbulence near the free surface and air–water mixing, which are not captured in currently-available single-phase, non-hydrostatic Reynolds Averaged Navier Stokes (RANS) models. In order to account for such dynamics, the boundary conditions proposed by Brocchini (2002) have been implemented in a two-dimensional vertical (2DV) non-hydrostatic RANS numerical model. For the theoretical boundary conditions of Brocchini (2002) to be applicable in the numerical model, appropriate closures have been adopted and mathematical equations have been proposed to calculate the coefficients introduced in the mentioned boundary conditions. Navier Stokes equations along with different turbulence closure models have been solved using finite volume method and pressure correction technique. According to the new boundary conditions, the normal-to-mean surface gradient of the turbulent kinetic energy (TKE) differs from zero and is computed as a balance between production and dissipation of TKE within the air–water mixing layer. Also, the kinematic and dynamic boundary conditions have been modified accordingly, to account for the effects of the thin two-phase layer formed at the free surface. The modified kinematic boundary condition allows for the mass exchange between the two-phase layer and the main body of the water. For the first time it is demonstrated that the proposed simple analytical model of Brocchini (2002) leads to improvements in the prediction of incipient breaking and the wave characteristics in the surf zone. This opens the way to a new, accurate but numerically low cost, approach for the computation of the air–water mixing that characterizes breaking waves. All the many benchmarking tests run to verify the ability of the new model show that significant improvements are achieved. Improvements are specifically observed in the prediction of: (I) breaking point and the breaking wave height, (II) the consequent dissipation of the wave energy observed in the form of the crest level distribution throughout the surf zone, (III) the magnitude of the horizontal velocity near the free surface, and (IV) the TKE distribution in depth. Notably, the novel numerical model does not use any parametric criteria for detecting the inception of breaking, thus it does not need calibration for different flow circumstances. Also, since no special treatments, such as hydrostatic pressure assumptions at the front face of the breaking waves are considered, the new model well captures the breaking-induced dissipation while giving a more accurate estimation of the dynamic pressure.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/277492 Collegamento a IRIS

2020
Fluid dynamics in the functional foregut of xylem-sap feeding insects: A comparative study of two Xylella fastidiosa vectors
JOURNAL OF INSECT PHYSIOLOGY
Autore/i: Ranieri, E.; Zitti, G.; Riolo, P.; Isidoro, N.; Ruschioni, S.; Brocchini, M.; Almeida, R. P. P.
Classificazione: 1 Contributo su Rivista
Abstract: Xylem sap sucking insects are adapted to ingest fluids under tension. Although much has been learned about such feeding strategy, this adaptation still poses several unresolved questions, including how these insects ingest against strong xylem sap tension. Xylem sap-feeding insects are vectors of the plant pathogenic xylem-limited bacterium Xylella fastidiosa. This bacterium colonizes the cuticular lining of the foregut of vectors in a persistent manner. We used micro-computed tomography and scanning electron microscopy to investigate the foregut morphometry of two X. fastidiosa vector species: Philaenus spumarius and Graphocephala atropunctata (Hemiptera: Aphrophoridae and Cicadellidae, respectively). On the basis of morphometric data, we built a hydrodynamic model of the foregut of these two insect species, focusing on the precibarium, a region previously shown to be colonized by X. fastidiosa and correlated with pathogen acquisition from and inoculation to plants. Our data show that space in the P. spumarius functional foregut could potentially harbor twice as many cells as similar space in G. atropunctata, although the opposite trend has been observed with biological samples. Average flow velocity of ingested fluid depended on the percentage of the cibarium volume exploited for suction: if the entire volume were used, velocities were in the range of meters per second. In contrast, velocities on the order of those found in the literature (about 10 cm/s) were attained if only 5% of the cibarium volume were exploited. Simulated bacterial colonization of the foregut was analyzed in relation to hydrodynamics and pressure needed for insects to ingest. Our model is designed to represent the diameter reduction of the food canal in both insect species when infected with X. fastidiosa. Results indicated that full bacterial colonization significantly increased the mean sap-sucking flow velocity. In particular, the colonization increased the maximum section-averaged velocity in the G. atropunctata more than two times and the net pressure needed to mantain the flow in the precibarium when colonized is relevant (about 0.151 MPa) if compared to a standard xylem sap tension (1 MPa). Bacterial colonization also influenced the sucking process of the G. atropunctata, by hindering the formation of a recirculation zone (or eddy), that characterizd the flow in the distal part of the precibarium when bacteria were absent. On the other hand, considering the pressure the insect must generate to feed, X. fastidiosa colonization probably influences fitness of the G. atropunctata more than that of P. spumarius.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/273201 Collegamento a IRIS

2020
Numerical modeling of flow and bed evolution of bichromatic wave groups on an intermediate beach using nonhydrostatic xbeach
JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING-ASCE
Autore/i: Ruffini, G.; Briganti, R.; Alsina, J. M.; Brocchini, M.; Dodd, N.; Mccall, R.
Classificazione: 1 Contributo su Rivista
Abstract: This paper analyzes the modeling of the hydro- A nd morphodynamics of bichromatic wave groups on an intermediate beach with an initial 1:15 slope. The nonhydrostatic version of XBeach was used to simulate two incident wave conditions of the experiments carried out within the HYDRALAB-IV Coupled High Frequency Measurement of Swash Sediment Transport and Morphodynamic (CoSSedM) project. The chosen forcing conditions have different strengths of swash-swash interaction. A procedure was developed to generate boundary conditions for the model that are able to fully account for both the bound and free long waves measured during the experiments. Using the normalized root-mean-squared error as a measure, this paper finds a higher accuracy of the nonhydrostatic version of XBeach in simulating swash-swash interaction from the hydrodynamics point of view, and worse performances in capturing the details of intragroup sediment transport. Nevertheless, the model is able to distinguish the relative difference in offshore swash sediment transport among different types of swash-swash interaction, and it is overall more successful in simulating beach morphodynamics when the swash sediment transport is of the same order of magnitude as the surf zone one.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/277100 Collegamento a IRIS

2020
Towards the simulation of flood evacuation in urban scenarios: Experiments to estimate human motion speed in floodwaters
SAFETY SCIENCE
Autore/i: Bernardini, G.; Quagliarini, E.; D'Orazio, M.; Brocchini, M.
Classificazione: 1 Contributo su Rivista
Abstract: Studies on flood risk assessment at urban scale are becoming increasingly oriented towards the use of evacuation simulation models for population's safety. However, such tools generally simplify human dynamics in floodwater conditions and need data to quantify proper individual's speed. Novel information on the above dynamics is here presented. A group of over 200 volunteers has been engaged in evacuation laboratory experiments carried out into an open channel. Results allow to estimate the pedestrian's isolated motion speed as a function of depth D [m] (in the range 20–70 cm) of floodwater, in both “walking” and “running” conditions. To this aim, experiments were carried out in still water. For each walking conditions and floodwater depth, correlations have been obtained between evacuation speed and age, individuals’ height, mass and body mass index. The existence of significant motion speed differences, depending on D, is underlined. In addition, general trends in evacuation speed reduction depending on the specific flood force per unit width M have been investigated and confirmed. It is also clarified how human physiology and kinematics (i.e. knee articulation) can induce specific speed-affecting effects depending on D. Such quantitative differences in motion discourage the use of fire or general-purpose databases for flood simulations, while such experimental data could be used as input for evacuation models to describe different evacuees’ walking types in evacuation procedure.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/276195 Collegamento a IRIS

2020
Wave-forced dynamics in the nearshore river mouths, and swash zones
EARTH SURFACE PROCESSES AND LANDFORMS
Autore/i: Brocchini, M.
Classificazione: 1 Contributo su Rivista
Abstract: The role of wave forcing on the main hydro‐morphological dynamics evolving in the shallow waters of the nearshore and at river mouths is analyzed. Focus is mainly on the cross‐shore dynamics that evolve over mildly sloping barred, dissipative sandy beaches from the storm up to the yearly timescale, at most. Local and non‐local mechanisms as well as connections across three main inter‐related subsystems of the nearshore – the region of generation and evolution of nearshore bars, river mouths and the swash zone – are analyzed. The beach slope is a major controlling parameter for all nearshore dynamics. A local mechanism that must be properly described for a suitable representation of wave‐forced dynamics of all such three subsystems is the proper correlation between orbital velocity and sediment concentration in the bottom boundary layer; while specific dynamics are the wave–current interaction and bar generation at river mouths and the sediment presuspension at the swash zone. Fundamental non‐local mechanisms are both infragravity (IG) waves and large‐scale horizontal vortices (i.e. with vertical axes), both influencing the hydrodynamics, the sediment transport and the seabed morphology across the whole nearshore. Major connections across the three subsystems are the upriver propagation of IG waves generated by breaking sea waves and swash–swash interactions, the interplay between the swash zone and along‐river‐flank sediment transport and the evolution of nearshore sandbars.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/270464 Collegamento a IRIS

2020
Hydrodynamics at a microtidal inlet: Analysis of propagation of the main wave components
ESTUARINE, COASTAL AND SHELF SCIENCE
Autore/i: Melito, Lorenzo; Postacchini, Matteo; Sheremet, Alex; Calantoni, Joseph; Zitti, Gianluca; Darvini, Giovanna; Penna, Pierluigi; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: The evolution of different wave components as they propagate within a microtidal inlet during a storm occurring from 24–26 January 2014 is analyzed, in order to improve knowledge on how microtidal river mouths typical of the Adriatic Sea behave. For the first time, the ”low-pass filter” mechanism previously ascertained at several macrotidal oceanic inlets around the world has been observed in the field with remarkably specific hydrodynamic conditions, i.e. low tide excursion, permanent connection with the sea and generally milder wave climate than in the ocean. Sea/swell (SS) waves were strongly dissipated before entering the river mouth, through the combined action of wave breaking due to reducing depths and opposing river currents enhanced by rainfall. Infragravity (IG) waves propagated upstream and significant IG wave heights of up to 0.4 m, about 13% of the local water depth, have been observed 400 m upriver (about 10 times the local SS peak wavelength) during storm climax. The IG wave energy here represented over 4% of the maximum offshore storm energy. IG wave components travelled upriver at estimated velocities between 3.6 m/s and 5.5 m/s (comparable with speeds of nonlinear long waves) during intense storm stages up to 600 m into the river channel (about 15 times the local SS peak wavelength), and are enhanced by tide-induced increase in water depths. It is estimated that tide-induced excursion accounted for about 80% of the total mean water elevation at storm peak at about 400 m into the river. Finally, tidal oscillations are detected up to 1.5 km upstream (about 40 times the local SS peak wavelength). This study highlights the dominance of astronomical tide over both wave setup and storm surge in controlling the upriver propagation of IG waves, even in a microtidal environment.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/273197 Collegamento a IRIS

2020
Sandbar dynamics in microtidal environments: Migration patterns in unprotected and bounded beaches
COASTAL ENGINEERING
Autore/i: Melito, Lorenzo; Parlagreco, Luca; Perugini, Eleonora; Postacchini, Matteo; Devoti, Saverio; Soldini, Luciano; Zitti, Gianluca; Liberti, Luca; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: Novel observations of bar features and migration patterns at three Italian sandy beaches in Senigallia (central Adriatic Sea) and Terracina (central Tyrrhenian Sea) are presented. While two of these beaches are unprotected, one is artificially embayed through the presence of a concrete jetty. Bar locations and motions are analysed with video imagery data sets from coastal monitoring stations. Wave climate from the Copernicus oceanographic model is used to correlate hydrodynamics and beach morphology. Clear net offshore migration (NOM) patterns are identified at all beaches, although exhibiting different response scales. At the low-slope beach of Senigallia (mean surf zone slope of 0.009) bars are more sensitive to seasonal changes in wave climate, with offshore shifts in winter and inactivity in summer. Mean annual migration rates of up to 0.26 m/day and 0.09 m/day are observed for outer and inner bars, respectively. No significant response to single storms is observed, except during a single NNE storm. No distinct erosive or accretive trend for the shoreline is evidenced. At the steep beach of Terracina (mean surf zone slope of 0.018), conversely, bars are strongly responsive to single storm events, with displacements of up to 25–50 m across a single storm. The mean inter-annual migration rate is 0.08 m/day for the single/outer bar, whereas a slight onshore trend (-0.02 m/day) for the newborn inner bar is established. The presence of an artificial jetty at the Misa river mouth in Senigallia, finally, leaves the bar system, typically oscillating around an equilibrium position, susceptible to larger seasonal oscillations and strong offshore migration due to two ESE storm events. Numerical simulations of nearshore circulation for two storms from different directions predict the birth of longshore currents, higher ratios of significant wave height to water depth, and stronger bottom orbital velocities over bars in case of the ESE storm, suggesting a greater tendency for offshore-directed sediment transport.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/283529 Collegamento a IRIS

2019
Monitoring for Coastal Resilience: A Project for Five Italian Beaches
Proceedings of the 2018 IEEE International Workshop on Metrology for the Sea
Autore/i: MELITO, LORENZO; Luca, Parlagreco; PERUGINI, ELEONORA; POSTACCHINI, Matteo; ZITTI, GIANLUCA; BROCCHINI, Maurizio
Editore: IEEE
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: This paper presents the COPEMAP project, fruit of a research collaboration between the Università Politecnica delle Marche and the Istituto Superiore per la Protezione e la Ricerca Ambientale. The project focuses on developing a methodology for the assessment of beach resilience as a function of both natural forcing (e.g. incoming wave fields) and natural protection (e.g. underwater sand bars). This is accomplished through simplified analyses of available video-monitoring data.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/263465 Collegamento a IRIS

2019
Research and Engineering for Resilient Infrastructures and Environment Protection
The First Outstanding 50 Years of “Università Politecnica delle Marche”
Autore/i: Bocci, Maurizio; Brocchini, Maurizio; Canestrari, Francesco; Cardone, Fabrizio; Corvaro, Sara; Darvini, Giovanna; Ferrotti, Gilda; Graziani, Andrea; Lorenzoni, Carlo; Mancinelli, Alessandro; Postacchini, Matteo; Soldini, Luciano; Virgili, Amedeo
Classificazione: 2 Contributo in Volume
Abstract: We discuss the contribution of the research groups that work at UNIVPM in the field of infrastructure engineering to the design of resilient hydraulic and transportation infrastructures and related solutions for the protection of the environment. After recalling the long history of research and engineering intervention of the groups of Hydraulics and Transportation Infrastructures of UNIVPM, we show how the activities of such groups are becoming of increasing importance in response to the growing request of innovative solutions for resilient infrastructures (e.g. coastal protection and maritime structures, road and airport pavements) and environment protection (e.g. coastal and river flood, air pollution, waste recycling and materials reuse). Such activities have been recently boosted by the resources made available to the two groups through the “Dipartimenti di Eccellenza” award, which largely focuses on the issue of engineering for resilient built and natural environments. A projection in the future of the activities of above is also proposed.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/273420 Collegamento a IRIS

2019
Sustainable Engineering for Resilient Built and Natural Environments
The First Outstanding 50 Years of “Università Politecnica delle Marche”
Autore/i: Alici, Antonello; Bocci, Maurizio; Bonvini, Paolo; Brocchini, Maurizio; Calamai, Alessandro; Canestrari, Francesco; Capozucca, Roberto; Carbonari, Alessandro; Carbonari, Sandro; Cardone, Fabrizio; Clementi, Francesco; Clini, Paolo; Cocchi, Giammichele; Corvaro, Sara; Darvini, Giovanna; Davì, Fabrizio; Dezi, Luigino; Di Giuseppe, Elisa; D’Orazio, Marco; Ferretti, Maddalena; Ferrotti, Gilda; Gara, Fabrizio; Giretti, Alberto; Graziani, Andrea; Lancioni, Giovanni; Lemma, Massimo; Lenci, Stefano; Lorenzoni, Carlo; Malinverni, Eva Savina; Mancinelli, Alessandro; Mariano, Fabio; Mentrasti, Lando; Mondaini, Gianluigi; Montecchiari, Piero; Munafò, Placido; Naticchia, Berardo; Postacchini, Matteo; Quagliarini, Enrico; Quattrini, Ramona; Ragni, Laura; Serpilli, Michele; Soldini, Luciano; Virgili, Amedeo; Zampini, Giovanni
Editore: Springer
Classificazione: 2 Contributo in Volume
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/272866 Collegamento a IRIS

2019
Wave-induced morphodynamics and sediment transport around a slender vertical cylinder
ADVANCES IN WATER RESOURCES
Autore/i: Miozzi, Massimo; Corvaro, Sara; Alves Pereira, Francisco; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: We study the dynamics of a sandy bed around a slender vertical cylinder forced by progressive, non-linear water waves. The seabed evolves continuously under the effects of the up-welling, down-welling and rolling events induced by vortical coherent structures. In turn, these are closely connected to the shape of the seabed, which is modified by the scouring and/or the deposition of the sand. Starting from a flat seabed, progressive waves induce a rapid and transient modification of the bottom morphology towards a dynamically stable equilibrium state, which is the focus of this work. The dynamical equilibrium state is a function of the wave period and is reached when the seabed morphology is not substantially altered. We describe such a state by an Eulerian in-phase analysis of the sand particle motion, inferred from Lagrangian data collected over a large number of wave passages. This analysis relies on the use of the defocusing digital PIV technique (DDPIV), for the first time applied to the specific flow of interest here. On the basis of the Eulerian analysis, the triggering of the key-events (up- and down-welling, rolling) over the wave phase is captured by identifying, through the Q > 0 criterion, the coherent flow structures responsible for the events. This analysis is coupled with the description of the sediment trajectories, analyzed in a Lagrangian manner and effectively assessing how and where the solid phase is transported during the key-events. Five main mobilization/transport mechanisms have been identified, three during the onshore flow and two during the offshore flow: (i) generation of a coherent structure reminiscent of a horseshoe vortex at the toe, (ii) intense scouring at the top of the flatbed region, (iii) vortex shedding in the wake during direct (onshore) flow, (iv) shear crossflow on the lee-side of the cylinder and (v) large vertical shearing in the flatbed region during the reverse (offshore) flow. At flow reversal, this shearing mechanism impacts on a significant area of sediments in the incoming region of the flow.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/254962 Collegamento a IRIS

2019
Monitoring for Coastal Resilience: Preliminary Data from Five Italian Sandy Beaches
SENSORS
Autore/i: Parlagreco, Luca; MELITO, LORENZO; Devoti, Saverio; PERUGINI, ELEONORA; SOLDINI, Luciano; ZITTI, GIANLUCA; BROCCHINI, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: Video-monitoring can be exploited as a valuable tool to acquire continuous, high-quality information on the evolution of beach morphology at a low cost and, on such basis, perform beach resilience analyses. This manuscript presents preliminary results of an ongoing, long-term monitoring programme of five sandy Italian beaches along the Adriatic and Tyrrhenian sea. The project aims at analyzing nearshore morphologic variabilities on a time period of several years, to link them to resilience indicators. The observations indicate that most of the beach width variations can be linked to discrete variations of sandbar systems, and most of all to an offshore migration and decay of the outermost bars. Further, the largest net shoreline displacements across the observation period are experienced by beaches with a clear NOM (Net Offshore Migration)-type evolution of the seabed.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/265226 Collegamento a IRIS

2019
A model chain approach for coastal inundation: Application to the bay of Alghero
ESTUARINE, COASTAL AND SHELF SCIENCE
Autore/i: Postacchini, Matteo; Lalli, Francesco; Memmola, Francesco; Bruschi, Antonello; Bellafiore, Debora; Lisi, Iolanda; Zitti, Gianluca; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: Coastal inundation is an important threat for many nearshore regions worldwide, and has significantly increased in the last years also due to sea-level rise and augmented impact of extreme events, like sea storms. Many countries and regions have recently invested to overcome such problems, which commonly lead to structure damages, beach erosion and many other consequences. Numerical modeling is an important tool for coastal inundation prediction, being a valuable support for management issues to mitigate the inundation risk or suggest resilient solutions. The present work illustrates a novel approach, based on a numerical model chain that exploits a tide-surge-wave operational modeling system (Kassandra), a phase-averaged model (ROMS-SWAN) for the wave propagation towards the shore, and a phase-resolving solver (NSWE) for the prediction of runup and coastal inundation. Such a chain is applied to the bay of Alghero (Sardinia, Italy), where the results of the mentioned chain are compared to those obtained using, in place of the phase-averaged model, an analytical model for the wave propagation. Results confirm that both chain approaches provide comparable inundations, though the use of the analytical, more approximate (e.g., less accurate and reliable description of wave breaking dissipation), model suggests more severe conditions and larger flooded areas. Our contribution provides a methodological approach for an accurate and reliable estimate of coastal flooding.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/263424 Collegamento a IRIS

2019
Flooding Pedestrians’ Evacuation in Historical Urban Scenario: A Tool for Risk Assessment Including Human Behaviors
RILEM Bookseries
Autore/i: Bernardini, Gabriele; Postacchini, Matteo; Quagliarini, Enrico; D’Orazio, Marco; Brocchini, Maurizio
Editore: Springer Netherlands
Classificazione: 2 Contributo in Volume
Abstract: In the future, safety in historical city centers will be significantly affected by climate change-related disasters, such as floods. Risk assessment in these scenarios requires the combination of a series of factors: possible events characterization; urban layout configuration, its influence on flooding spreading and induced environmental modification; human factor, especially during first emergency phases. Historic urban scenario features (e.g.: compact urban fabrics; position near floodplains; possible inefficient early warning systems) additionally increase individuals’ risks. According to a “behavioral design” approach, developing flood evacuation simulation tools would help safety designers in assessing population’s exposure and then in suggesting emergency strategies to help citizens during such hazardous phases. This paper proposes a flooding evacuation simulation tool, which jointly represents the individuals’ evacuation motion towards safe areas, and the floodwaters spreading in the urban scenario. In particular, the simulator is founded on previous literature results concerning emergency behaviors and motion quantities (e.g.: evacuation speed as function of floodwaters flow) and adopts an agent-based model architecture. A part of the historic city center of Senigallia, an Italian city that suffered a significant flood in 2014, is chosen as application case-study to show tool capabilities. Results outline risk levels for individuals, and evidence critical points (in the urban space and during the time) for man-floodwaters-environment interactions (e.g.: being swept away by floodwaters). By evaluating probable evacuees’ choices in different scenarios, the tool is proposed to check the effectiveness of solutions for reducing evacuation process risks (e.g.: emergency planning; architectural elements development; interventions for floodwaters collection also in urban scenarios).
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/263425 Collegamento a IRIS

2019
Long waves approaching the coast: Green’s law generalization
JOURNAL OF OCEAN ENGINEERING AND MARINE ENERGY
Autore/i: Lalli, Francesco; Postacchini, Matteo; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: The original Green’s relationship provides the amplitude of a long wave at a given water depth as a function of the amplitude in deeper waters, accounting for the wave shoaling, taken as a one-dimensional process, and neglecting both diffraction and refraction effects. An analytical application of Green’s law can only be made in case of simple bathymetries, monotonically increasing in the cross-shore direction and being longshore uniform. In the present work, a new formulation is proposed, based on Green’s law, for the direct calculation of the change in amplitude of a long wave that approaches the coast while traveling over a natural bathymetry, characterized by a general shape. Hence, the effects due to the ray curvature provided by the refraction/diffraction phenomena are accounted for. In detail, a generalization of Green’s law is proposed by introducing a numerically computed coefficient. Comparisons have been provided between the wave amplitude evolution, reconstructed using the proposed law, and the results of numerical simulations, run using a solver based on the solution of the shallow water equations. Although local effects due to obstacles are not properly captured, such comparisons reveal that the generalized Green’s law works well in the far field under different wave and complex morphological conditions.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/273419 Collegamento a IRIS

2019
On a layer model for spilling breakers: A preliminary experimental analysis
EUROPEAN JOURNAL OF MECHANICS. B, FLUIDS
Autore/i: Lucarelli, A.; Lugni, C.; Falchi, M.; Felli, M.; Brocchini, M.
Classificazione: 1 Contributo su Rivista
Abstract: Accurate and reliable experimental data of a sloshing-induced, rapidly-evolving spilling breaker, are used to understand the specific physics of this phenomenon and to partially evaluate a simplified analytical model by Brocchini and co-workers (Brocchini , 1996; Misra et al., 2004, 2006). Such model is based on a three-layer structure: an underlying potential flow, a thin, turbulent single-phase layer in the middle and a turbulent two-phase layer (air–water) on the upper part. The experiments were carried out by using a 3 m long, 0.6 m deep and 0.10 m wide tank, built in Plexiglas and forced through an hexapode system, this allowing for an high accuracy of the motion. Mean and turbulent kinematic quantities were measured using the Particle Image Velocimetry (PIV) technique. To ensure repeatability of the phenomenon, a suitable breaker event was generated to occur during the first two oscillation cycles of the tank. The tank motion was suitably designed using a potential (HPC) and a Navier–Stokes solver. The latter, was useful to understand the dimension of the area of interest for the measurements. The evolution of the breaker is described in terms of both global and local properties. Wave height and steepness show that after an initial growth, the height immediately decays after peaking, while the wave steepness remains constant around 0.25. The evolution of the local properties, like vorticity and turbulence, vortical and turbulent flows displays the most interesting dynamics. Two main stages characterize such evolution. In stage (1), regarded as a ‘‘build-up’’ stage, vorticity and TKE rapidly reach their maximum intensity and longitudinal extension. During such stage the thickness of the single-phase turbulent region remains almost constant. Stage (2), is regarded as a ‘‘relaxation’’ stage, characterized by some significant flow pulsation till the wave attains a quasi-steady shape. In support to the analytical, three-layer model of Brocchini and co-workers it is demonstrated that the cross-flow profile of the mean streamwise velocity U inside the single-phase turbulent layer is well represented by a cubic polynomial. However, differently from available steadystate models the coefficient of the leading-order term is function of time: A = A(s, t). During stage (1) a fairly streamwise-uniform distribution of U is characterized by A(s, t) ≈ 1, while during stage (2) U is less uniform and A varies over a much larger range.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/264189 Collegamento a IRIS

2019
Numerical investigation on the effects of the pitch angle on the efficiency of an Archimedean-type turbine
proceeding of the 13th European Wave and Tidal Energy Conference (EWTEC 2019)
Autore/i: Zitti, Gianluca; Fattore, F.; Brunori, A.; Brunori, B.; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/292652 Collegamento a IRIS

2019
Linear depth inversion sensitivity to wave viewing angle using synthetic optical video
COASTAL ENGINEERING
Autore/i: Perugini, Eleonora; Soldini, Luciano; Palmsten, Margaret L.; Calantoni, Joseph; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/269388 Collegamento a IRIS

2018
Normalized Scalar Product Approach for Nearshore Bathymetric Estimation from X-Band Radar Images: An Assessment Based on Simulated and Measured Data
IEEE JOURNAL OF OCEANIC ENGINEERING
Autore/i: Ludeno, Giovanni; Postacchini, Matteo; Natale, Antonio; Brocchini, Maurizio; Lugni, Claudio; Soldovieri, Francesco; Serafino, Francesco
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/253030 Collegamento a IRIS

2018
A new video monitoring station along the Adriatic coast
XXXVI Convegno nazionale di Idraulica e Costruzioni Idrauliche
Autore/i: Perugini, Eleonora; Soldini, Luciano; Palmsten, Margaret L.; Calantoni, Joseph; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/266318 Collegamento a IRIS

2018
FLOOD IMPACTS ON BUILDINGS: FIRST EXPERIMENTAL AND NUMERICAL RESULTS
Proceedings del XXXVI Convegno Nazionale di Idraulica e Costruzioni Idrauliche
Autore/i: Brocchini, Maurizio; Capozucca, Roberto; Clementi, Francesco; Darvini, Giovanna; Giordano, Ersilia; Lenci, Stefano; Postacchini, Matteo; Zitti, Gianluca
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/263397 Collegamento a IRIS

2018
Wave-Current Interactions and Infragravity Wave Propagation at a Microtidal Inlet
e-Proceedings of the 3rd EWaS International Conference on "Insights of the Water-Energy-Food Nexus"
Autore/i: Melito, Lorenzo; Postacchini, Matteo; Sheremet, Alex; Calantoni, Joseph; Zitti, Gianluca; Darvini, Giovanna; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Recent studies have shown that wave blocking occurs at river mouths with strong currents typically preventing relatively short period sea and swell waves from propagating up the river. However, observations demonstrate that lower frequency waves, so-called infragravity waves, do pass through and propagate up the river, particularly during storm events. We present observations from the Misa River estuary of infragravity wave propagation up the river during storm conditions. A model of the complex nonlinear interactions that drive infragravity waves is presented. The results are discussed in the context of an observed river mouth bar formed in the lower reach of the Misa River.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/258992 Collegamento a IRIS

2018
ANALYSIS OF MIXING AT RIVER MOUTHS: THE ROLE OF MACROVORTICES AND SUB-GRID TURBULENCE
8th International Symposium on Environmental Hydraulics
Autore/i: Melito, Lorenzo; Postacchini, Matteo; Darvini, Giovanna; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: INTRODUCTION A good understanding of flow mixing is important for properly describing the morphodynamics of the nearshore and river mouths. In recent years the modeling of flow mixing in natural shallow water regions has seen improvement thanks to the increasing computational power and the development of reliable and feasible models for large eddies and sub-grid turbulence. We here investigate the interplay between macrovortices, i.e. large-scale vortices with vertical axes, typical of shallow water flows, and the sub-grid turbulence characterizing river mouth flows, where a river current interacts with incoming sea waves. Generation of macrovortices is ensured by differential breaking at an estuarine shoal, whose presence also allows for inspection of the role of complex bathymetries (Olabarrieta et al., 2014). To this end, numerical simulations of wave-current interaction are performed by means of a solver for wave propagation in shallow water by Brocchini et al. (2001), integrated with a simple Horizontal Large Eddy Simulation (HLES) model proposed by Grosso et al. (2007). THE NUMERICAL MODEL The numerical model used for the tests (Brocchini et al., 2001) is based on the Nonlinear Shallow Water Equations (NSWE) and implements the finite-volume Weighted Averaged Flux method. The model is modified to give account of the dynamics induced by a river discharging at sea, and allows for computation of the morphological evolution of the bottom through the weak hydro-morphodynamic coupling proposed by Postacchini et al. (2012). The model also implements a simple HLES model to consider, in an approximate fashion, the dissipative terms due to sub-grid turbulence, which would, otherwise, be neglected by a classic approach of the NSWE (Grosso et al., 2007). THE TESTS Similarly to the wave-current interaction tests performed in the work of Olabarrieta et al. (2014), we reproduce the interaction of a steady river jet with weak-to-strong waves over a bathymetry characterized by a large river mouth shoal, and the generation, organization and migration of macrovortices as function of the sub-grid turbulence (HLES eddy viscosity varied between 0 and 0.1). THE RESULTS The numerical simulations reveal a significant generation and offshore advection of macrovortices at the seaward edge of the mouth shoal. Important turbulent structures are also observed, during the initial stages of the motion, at the corners of the inlet mouth, where the canalized, intense river current spreads over the shoal and interacts with the quiescent sea waters; these transient vortices dissipate fairly rapidly. The activation of the HLES model does not seem to have significant effects on the transient inlet vortices, causing only a limited decrease in their intensity as the sub-grid turbulence increases. Conversely, the shoal macrovortices are more sensible to changes in sub-grid turbulence: their intensity sensibly decreasing as the eddy viscosity increases. Notably, use of eddy viscosity parameters of the order 10-1 suppresses the generation of macrovortices in the shoal zone. Further considerations on these mechanisms will be illustrated at the conference.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/270377 Collegamento a IRIS

2018
METODI E MODELLI PER L’ANALISI DELL’INONDAZIONE COSTIERA: UNO STUDIO PER LA BAIA DI ALGHERO
Atti del XXXVI Convegno Nazionale di Idraulica e Costruzioni Idrauliche
Autore/i: Lalli, Francesco; Bruschi, Antonello; Luisa Cassese, Maria; Di Manna, Pio; Lisi, Iolanda; Vittori, Eutizio; Memmola, Francesco; Postacchini, Matteo; Bellafiore, Debora; Bajo, Marco; Boy, Alessandra; Pillai, Alessandra; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/263428 Collegamento a IRIS

2018
BATHYMETRY AND WAVE FIELD ESTIMATE USING A RADAR/NSP APPROACH: A NUMERICAL ANALYSIS
Atti del XXXVI Convegno Nazionale di Idraulica e Costruzioni Idrauliche
Autore/i: Ludeno, Giovanni; Postacchini, Matteo; Lugni, Claudio; Soldovieri, Francesco; Serafino, Francesco; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/263429 Collegamento a IRIS

2018
MODELLING HUMAN MOTION IN FLOOD EVACUATION: PRELIMINARY EXPERIMENTAL RESULTS
Atti del XXXVI Convegno Nazionale di Idraulica e Costruzioni Idrauliche
Autore/i: Postacchini, Matteo; Ascenzi, MARIA BEATRICE; Bruni, Ramona; Finizio, Fiorenza; Bernardini, Gabriele; Quagliarini, Enrico; Brocchini, Maurizio; D'Orazio, Marco
Classificazione: 2 Contributo in Volume
Abstract: Human behaviors in flood emergency affect individuals’ safety levels in urban scenarios. Evacuation simulators are needed to fully perform risk assessment and risk-reduction solutions evaluations. Volunteers are engaged in laboratory experiments to propose floodwaters-evacuation motion relations. A mannequin (representing an adult) is used for determining human stability limits in floodwaters. Preliminary results are compared to previous works and relations could be added to evacuation simulators.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/263430 Collegamento a IRIS

2018
COHERENT VORTICAL STRUCTURES IN PLUNGING BREAKERS
Atti del XXXVI Convegno Nazionale di Idraulica e Costruzioni Idrauliche
Autore/i: De Serio, Francesca; Brocchini, Maurizio; Buriani, Federica; Corvaro, Sara; Mossa, Michele
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/263388 Collegamento a IRIS

2018
Effects of the wave climate on a multiple sandbar system
Proceedings of the 5th IAHR EUROPE CONGRESS New Challenges in Hydraulic Research and Engineering
Autore/i: Perugini, E.; Soldini, L.; Lorenzoni, C.; Brocchini, M.; Palmsten, M. L.; Calantoni, J.
Editore: The International Association for Hydro-Environment Engineering and Research (IAHR)
Luogo di pubblicazione: Madrid
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/265534 Collegamento a IRIS

2018
Experimental and Numerical Investigation of Pre-Breaking and Breaking Vorticity within a Plunging Breaker
WATER
Autore/i: Diana De Padova, ; Brocchini, Maurizio; Buriani, Federica; Corvaro, Sara; Francesca De Serio, ; Michele, Mossa; Stefano, Sibilla
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/256838 Collegamento a IRIS

2018
Hydro- and morpho-dynamics induced by a vertical slender pile under regular and random waves
JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING-ASCE
Autore/i: Corvaro, Sara; Marini, Francesco; Mancinelli, Alessandro; Lorenzoni, Carlo; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: This paper proposes an experimental study of the hydro- and morpho-dynamics induced by a slender vertical pile fitted into a sandy seabed and forced by sea waves in finite waters. The scour depth at the pile and the seabed morphology around it were measured and analyzed for both regular and random wave forcing. Scour depths due to regular waves were compared to those predicted in a previous study, revealing good agreement. The maximum scour depth occurred at the lateral side of the pile for waves characterized by a Keulegan-Carpenter (KC) number smaller than 7–8 and behind the pile for waves with KC>7–8. Such a result revealed an asymmetric effect on the scour depth because of the weaker reversal flow. This behavior was more evident for nonlinear waves being crests larger than troughs and, as a consequence, vortices, responsible for the scour processes, became even more energetic around crest stages. To better understand the dynamics in front of, around, and behind the cylinder, pressure measurements were obtained to evaluate the generation and evolution of vortices. The pressure data showed that the adverse pressure gradient around the pile was higher than on the upstream of the pile. The analyses of the pressure data seemed to confirm that, if the forcing was only due to waves, the effect of the lee-wake vortices on the scour depth around the cylinder was stronger than that due to the horseshoe vortices. Finally, the practical stochastic method proposed by previous authors to compute the maximum scour depth around a vertical pile exposed to random waves was verified. The best adaptation between measured and predicted scour depths was obtained by taking into account approximately half of the highest waves (instead of one-tenth) over the threshold; such a condition is still cautionary for a practical point of view. A simplification of the previously discussed methodology was proposed in which the characteristic wave that generates the scour depth is defined.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/263122 Collegamento a IRIS

2018
Extra Strain Rates in an unsteady spilling breaking wave
SCIENTIFIC REPORTS
Autore/i: Lucarelli, Alessia; Lugni, Claudio; Falchi, Massimo; Felli, Mario; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: We analyze the extra strain rates that characterize a curved, thin mixing layer induced at an unsteady spilling breaker. We focus on the flow curvature, which induces some extra rates of strain that should be accounted for in algebraic-type turbulence closures. The comparison between the analytical formulation proposed by Brocchini and co-workers for a single-phase turbulent thin layer of fluid and the data, obtained from a Particle Image Velocimetry (PIV) dedicated experimental program, reveals that the order of magnitude of the extra rates of strain induced by the streamline curvature, is comparable with that of the simple shear. This differs from what observed for the geometric curvature terms and from what occurs at hydraulic jumps, typically used to model steady breakers.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/264187 Collegamento a IRIS

2018
An assessment of the roller approach for wave breaking in a hybrid finite-volume finite-difference Boussinesq-type model for the surf-zone
APPLIED OCEAN RESEARCH
Autore/i: Tatlock, Benjamin; Briganti, Riccardo; Musumeci, Rosaria E.; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: This paper investigates the application of the roller approach for breaking waves in a 1D hybrid finite-volume finite-difference weakly-nonlinear Boussinesq-type model. The vorticity transport equation is employed to model the movement of vorticity through the fluid. This allows vertical profiles of horizontal velocity and undertow to be computed. Previous implementations of this method caused numerical dissipation that influenced the physical behaviour of the breaking process. The use of a hybrid scheme overcomes this issue as the need to filter flow variables in the surf-zone is removed. Greater numerical stability increases the flexibility of the calibration parameters, allowing finer control over the breaking process and a more detailed investigation of the underlying physics. The mechanism used to dissipate energy during breaking is derived from physical principles and the Boussinesq equations are retained throughout the breaking procedure, providing a realistic description of the hydrodynamics throughout the surf-zone. The dissipative performance of the proposed model is discussed and compared with other state-of-the-art approaches, proving the feasibility and value of using a rotational roller model with a finite-volume finite-difference scheme to model surf-zone hydrodynamics with a Boussinesq-type model. Tests involving waves breaking on a sloping beach are performed to validate against results from physical experiments, demonstrating the model to be capable of accurately resolving profiles of the free surface, velocity and undertow. The resulting new model overcomes many of the issues encountered by previous Boussinesq solvers based on the same approach and provides significant improvements in the accuracy of predictions of breaking wave processes. The proposed approach is very flexible and can be used in any hybrid finite-volume finite-difference weakly-nonlinear Boussinesq-type model.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/255066 Collegamento a IRIS

2018
Experimental Setup for the Validation of the Bio-Inspired Thruster of an Ostraciiform Swimming Robot
2018 14th IEEE/ASME International Conference on Mechatronic and Embedded Systems and Applications, MESA 2018
Autore/i: Costa, D.; Callegari, M.; Palmieri, G.; Scaradozzi, D.; Brocchini, M.; Zitti, G.
Editore: Institute of Electrical and Electronics Engineers Inc.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In the last two decades, bio-inspired solutions have been thoroughly investigated as a source of efficiency and manoeuvrability improvement for underwater robots. The possibility to design a machine capable of propelling itself like a marine animal strongly depends on the understanding of the mechanics principles underlying biological swimming. The adoption of advanced simulation and measurement techniques is then fundamental to investigate the fluid-structure interaction phenomena characterizing the locomotion of aquatic animals. To address this very ambitious objective, the Authors designed an experimental setup devised to investigate the propulsive performances of an ostraciiform swimming robot. The numerical simulations performed on an oscillating foil led to the design of a dedicated force sensor, able to allow a complete characterization of the bio-inspired thruster and its actuation mechanism. The experimental test campaign is still under development but the results of the preliminary tests are hereby provided
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/261561 Collegamento a IRIS

2018
Waves and Currents at a River Mouth: The Role of Macrovortices, Sub-Grid Turbulence and Seabed Friction
WATER
Autore/i: Melito, Lorenzo; Postacchini, Matteo; Darvini, Giovanna; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: Numerical experiments of wave-current interaction have been performed to investigate the evolution and dissipation of horizontal large-scale vortical structures generated by differential wave breaking and current shearing at river mouths. Specific focus is on the role played by turbulence of scales smaller than the water depth and by seabed friction on the dissipation of the mentioned macrovortices. The analysis reveals two regions of turbulence generation: at the river mouth, and along the curved seaward boundary of the shoal. In the latter zone, macrovortices are formed due to differential wave breaking induced by the sudden variation in water depth and enhanced by opposing currents which favour wave steepening. Such vortices are then advected towards the shore. Among the dissipative mechanisms, dissipation induced by seabed friction is deemed dominant, in particular in the most shallow waters of the shoal. Sub-grid turbulence dissipation, conversely, is more efficient offshore, although exerting some effect also over the shoal when supported by the continuous action of waves.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/258065 Collegamento a IRIS

2018
EFFICIENCY EVALUATION OF AN ARCHIMEDEAN-TYPE HYDROKINETIC TURBINE IN A STEADY CURRENT
proceeding of the 13th International Conference on Hydrodynamics
Autore/i: Zitti, Gianluca; Brocchini, Maurizio; Fattore, F.; Brunori, A.; Brunori, B.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/292654 Collegamento a IRIS

2017
Wave attenuation over porous seabeds: A numerical study
OCEAN MODELLING
Autore/i: Torres-Freyermuth, Alec; Brocchini, Maurizio; Corvaro, Sara; Pintado-Patiño, José Carlos
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251135 Collegamento a IRIS

2017
A preliminary combined simulation tool for the risk assessment of pedestrians' flood-induced evacuation
ENVIRONMENTAL MODELLING & SOFTWARE
Autore/i: BERNARDINI, GABRIELE; POSTACCHINI, MATTEO; QUAGLIARINI, ENRICO; BROCCHINI, MAURIZIO; CIANCA, CATERINA; D'ORAZIO, Marco
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251392 Collegamento a IRIS

2017
Prediction of non-breaking wave induced scour depth at the trunk section of breakwaters using Genetic Programming and Artificial Neural Networks
COASTAL ENGINEERING
Autore/i: Pourzangbar, Ali; Losada, Miguel A.; Saber, Aniseh; Ahari, Lida Rasoul; Larroudé, Philippe; Vaezi, Mostafa; BROCCHINI, MAURIZIO
Classificazione: 1 Contributo su Rivista
Abstract: Scour may act as a threat to coastal structures stability and reduce their functionality. Thus, protection against scour can guarantee these structures’ intended performance, which can be achieved by the accurate prediction of the maximum scour depth. Since the hydrodynamics of scour is very complex, existing formulas cannot produce good predictions. Therefore, in this paper, Genetic Programming (GP) and Artificial Neural Networks (ANNs) have been used to predict the maximum scour depth at breakwaters due to non-breaking waves (S /Hmax nb). The models have been built using the relative water depth at the toe (h /L toe nb), the Shields parameter (θ), the non-breaking wave steepness (H /L nb nb), and the reflection coefficient (Cr), where in the case of irregular waves, Hnb=Hrms, Tnb=Tpeak and Lnb is the wavelength associated with the peak period (Lnb=Lp). 95 experimental datasets gathered from published literature on small-scale experiments have been used to develop the GP and ANNs models. The results indicate that the developed models perform significantly better than the empirical formulas derived from the mentioned experiments. The GP model is to be preferred, because it performed marginally better than the ANNs model and also produced an accurate and physically-sound equation for the prediction of the maximum scour depth. Furthermore, the average percentage change (APC) of input parameters in the GP and ANNs models shows that the maximum scour depth dependence on the reflection coefficient is larger than that of other input parameters.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/247011 Collegamento a IRIS

2017
Prediction of scour depth at breakwaters due to non-breaking waves using machine learning approaches
APPLIED OCEAN RESEARCH
Autore/i: Pourzangbar, Ali; BROCCHINI, MAURIZIO; Saber, Aniseh; Mahjoobi, Javad; Mirzaaghasi, Masoud; Barzegar, Mohammad
Classificazione: 1 Contributo su Rivista
Abstract: Coastal structures may cease to function properly due to seabed scouring. Hence, prediction of the maximum scour depth is of great importance for the protection of these structures. Since scour is the result of a complicated interaction between structure, sediment, and incoming waves, empirical equations are notas accurate as machine learning schemes, which are being widely employed for the coastal engineering modeling. In this paper, which can be regarded as an extension of Pourzangbar et al. (2016), two soft computing methods, a support vector regression (SVR), and a model tree algorithm (M5'), have been implemented to predict the maximum scour depth due to non-breaking waves. The models predict therelative scour depth (Smax/H0) on the basis of the following variables: relative water depth at the toe ofthe breakwater (htoe/L0), Shields parameter (theta), non-breaking wave steepness (H0/L0), and reflection coef-ficient (Cr). 95 laboratory data points, extracted from dedicated experimental studies, have been used for developing the models, whose performances have been assessed on the basis of statistical parameters.The results suggest that all of the developed models predict the maximum scour depth with high preci-sion, the M5model performed marginally better than the SVR model and also allowed to define a set oftransparent and physically sound relationships. Such relationships, which are in good agreement withthe existing empirical findings, show that the relative scour depth is mainly affected by wave reflection.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/247012 Collegamento a IRIS

2017
Comparison between the wintertime and summertime dynamics of the Misa River estuary
MARINE GEOLOGY
Autore/i: Brocchini, Maurizio; Calantoni, Joseph; Postacchini, Matteo; Sheremet, Alex; Staples, Tracy; Smith, Joseph; Reed, Allen H.; Braithwaite III, Edward F.; Lorenzoni, Carlo; Russo, Aniello; Corvaro, Sara; Mancinelli, Alessandro; Soldini, Luciano
Classificazione: 1 Contributo su Rivista
Abstract: The Misa River on the Italian Adriatic coast is typical of the rivers that drain the Apennine Mountain range. The focus of this study, conducted in the late summer of 2013 and mid-winter of 2014, was to contrast the general wintertime-summertime dynamics in the Misa River estuarine systemrather than investigate specific dynamical features (e.g. offshore sediment transport, channel seiche, and flocculation mechanisms). Summertime conditions of the Misa River estuary are characterized by low freshwater discharge and net sediment deposition whereas, in the wintertime, the Misa River and estuary is characterized by high episodic freshwater discharge and net erosion and sediment export. Major observed differences between wintertime-summertime dynamics in the Misa River and estuary are a result of seasonal-scale differences in regional precipitation and forcing conditions driven largely by the duration and intensity of prevailing wind patterns that frequently change direction in summertime while keep almost constant directions for much longer periods in wintertime, thus generating major sea storms. Sediment deposition was observed in the final reach of the Misa River and estuary in the summertime. However, in the wintertime, large flood events led to sediment erosion and export in the final reach of the Misa River and estuary that, in conjunction with storm-wave-induced mud transport, led to sediment deposition at the river entrance and in the adjacent nearshore region. The seasonal cyclic pattern of erosion and deposition was confirmedwith bathymetric surveys of the final reach of the estuarine region. A critical component for the balance between summertime deposition and wintertime erosion was the presence of an underlying mat of organic deposits that limited the availability of sediments for erosion in winter, when massive debris transport occurs. Further, suspended cohesive sediments flocs were subjected to smaller hydrodynamic stresses in the summertime favoring depositionwithin the estuary. Conversely, during wintertime storms, flocswere subjected to larger hydrodynamic stresses favoring breakup into smaller flocs and deposition outside the estuary.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/247010 Collegamento a IRIS

2017
Investigation of the dynamic loads on a vertically oscillating circular cylinder close to the sea bed: The role of viscosity
JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING-TRANSACTIONS OF THE ASME
Autore/i: Pierro, Alessio; Tinti, Enrico; LENCI, Stefano; BROCCHINI, MAURIZIO; Colicchio, Giuseppina
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251394 Collegamento a IRIS

2017
Snow avalanches striking water basins: behaviour of the avalanche’s centre of mass and front
NATURAL HAZARDS
Autore/i: ZITTI, GIANLUCA; Ancey, C.; POSTACCHINI, MATTEO; BROCCHINI, MAURIZIO
Classificazione: 1 Contributo su Rivista
Abstract: We study the behaviour of a low-density granular material entering a water basin by means of a simplified two-dimensional model, with the aim to understand the dynamics of a snow avalanche impacting a water basin like an alpine lake or a fjord. The low density of the impacting mass induces an uplift buoyancy force and, consequently, a complicated interaction between the solid and fluid phase. This paper provides an insight into the motion of the impacting mass, by presenting a simplified, two-dimensional model, where the snow is described by a low-density granular material. First, small-scale experiments, based on the Froude similarity with snow avalanches, are used to evaluate the motion of reference points of the impacting mass, i.e. the front (F), centre of mass (C) and deepest point (L). Then, applying the mass and momentum conservation principles to a fixed volume, we show that the mean motion of the impacting mass is similar to that of a damped oscillator. The stretch of the impacting mass motion is described through the motion of the reference points F and L.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/248897 Collegamento a IRIS

2017
A depth semi-averaged model for coastal dynamics
PHYSICS OF FLUIDS
Autore/i: Antuono, M.; Colicchio, G.; Lugni, C.; Greco, M.; Brocchini, M.
Classificazione: 1 Contributo su Rivista
Abstract: The present work extends the semi-integrated method proposed by Antuono and Brocchini [“Beyond Boussinesq-type equations: Semi-integrated models for coastal dynamics,” Phys. Fluids 25(1), 016603 (2013)], which comprises a subset of depth-averaged equations (similar to Boussinesq-like models) and a Poisson equation that accounts for vertical dynamics. Here, the subset of depth-averaged equations has been reshaped in a conservative-like form and both the Poisson equation formulations proposed by Antuono and Brocchini [“Beyond Boussinesq-type equations: Semi-integrated models for coastal dynamics,” Phys. Fluids 25(1), 016603 (2013)] are investigated: the former uses the vertical velocity component (formulation A) and the latter a specific depth semi-averaged variable, Upsilon (formulation B). Our analyses reveal that formulation A is prone to instabilities as wave nonlinearity increases. On the contrary, formulation B allows an accurate, robust numerical implementation. Test cases derived from the scientific literature on Boussinesq-type models—i.e., solitary and Stokes wave analytical solutions for linear dispersion and nonlinear evolution and experimental data for shoaling properties—are used to assess the proposed solution strategy. It is found that the present method gives reliable predictions of wave propagation in shallow to intermediate waters, in terms of both semi-averaged variables and conservation properties.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/251393 Collegamento a IRIS

2016
PROTEZIONE DELLO SCAVO AL PIEDE DI UN PALO VERTICALE
Atti del Convegno Nazionale di Idraulica e Costruzioni Idrauliche
Autore/i: Mancinelli, Alessandro; Corvaro, Sara; Lorenzoni, Carlo; Tondi, Maria Cristina; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/249690 Collegamento a IRIS

2016
FLOW DYNAMICS OF WAVES PROPAGATING OVER DIFFERENT PERMEABLE BEDS
Proceedings of "35th Conference on Coastal Engineering" - ICCE2016
Autore/i: Corvaro, Sara; Mancinelli, Alessandro; Brocchini, Maurizio
Editore: Patrick Lynett
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/249063 Collegamento a IRIS

2016
Escosed: Observations of Morphodynamics during Bora at the Mouth of the Misa River
International Conference on Multiphase Flow - ICMF 2016
Autore/i: Calantoni, J.; Sheremet, A.; Brocchini, Maurizio; Postacchini, Matteo
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The shallow mouth of the Misa River, Senigallia, Italy is exposed to wind and waves from the Adriatic Sea and is vulnerable to morphodynamic activity during even moderate storm events (e.g., winter Bora). Sediment loads and transport patterns may be strongly influenced by the confluence of fine cohesive suspended sediment contained in the discharge from the river mixing with coarser sandy material stirred up by waves impinging on the river mouth. Observations of rapid changes in bed elevation along a transect extending offshore of the river mouth were made using a combination of instruments deployed from 23-27 January 2014 at two locations in roughly 5 m water depth and 6 m water depth. At the 5 m water depth location over 0.4 m of deposition was observed roughly during a 6-hour period. Similarly, at the 6 m water depth location nearly 0.2 m of deposition was observed roughly over a 6-hour period with approximately a two-hour time lag. The onset of deposition was concurrent with a change in direction of the mean currents at both locations and a change in direction of wave skewness observed at the 5 m water depth location. We hypothesize that sandbar migration was responsible for the observed changes in bed elevation at both locations. Our analysis will focus on sediment transport modeling to explain rates of deposition and time lag of the observed changes in bed elevation at the 5 m and 6m water depth locations.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/247228 Collegamento a IRIS

2016
HYDRODYNAMICS OF A MUDDY ESTUARINE ENVIRONMENT: SUMMERTIME VS WINTERTIME CONDITIONS
The 12th International Conference on Hydrodynamics
Autore/i: Brocchini, Maurizio; Calantoni, Joseph; Postacchini, Matteo; Reed, Allen; Lorenzoni, Carlo; Mancinelli, Alessandro
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The hydrodynamics of an estuarine environment characterized by cohesive sediments, has been studied through a pair of experimental campaigns performed at the mouth of the Misa River. The Misa River flows from the Apennine Mountains and enters the Adriatic Sea in Senigallia, a tourist town located on the Mid-East coast of Italy. The estuary of the Misa River has characteristics of a field-scale laboratory; the final reach is highly engineered with containment structures. Consequently, it was chosen as a suitable site for the experiments undertaken during the EsCoSed (“Estuarine Cohesive Sediment”) Project. The estuarine environment of the Misa River was observed during both summertime and wintertime experiments. The hydrodynamics was monitored using both Eulerian (e.g., bottom moored platforms at both the river-bed and sea-bed with high-resolution ADCPs recording velocity profiles) and Lagrangian (e.g., surface drifters) instrumentation, allowing for the characterization of the flow field during very different flow conditions. The climate occurring before and during the investigated periods has also been analyzed through use of numerical simulations, wave buoy measurements, and tide gauges. A comparative analysis between summertime and wintertime conditions, focused on wave-current forcing and local estuarine hydrodynamics, is underway. The preliminary results highlight the control of wind direction on the observed hydrodynamics. During the summertime the wind frequently changes direction. Conversely, during wintertime the wind direction remains fairly constant leading to severe storms. The extreme wintertime events generate intense sediment transport driving morphologic change.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/247222 Collegamento a IRIS

2016
Condizioni al Contorno di Riva Morfodinamiche: Alcuni Aspetti della Metodologia di Validazione
Atti del XXXV Convegno Nazionale di Idraulica e Costruzioni Idrauliche
Autore/i: Perugini, E.; Postacchini, Matteo; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/247227 Collegamento a IRIS

2016
MORPHODYNAMICS AROUND A SLENDER CYLINDER UNDER A WAVY BOUNDARY LAYER
Proceedings of ICMF 2016 - 9th International Conference on Multiphase Flow
Autore/i: Corvaro, Sara; Brocchini, Maurizio; Miozzi, Massimo; Pereira, Francisco Alves; Lorenzoni, Carlo; Mancinelli, Alessandro; Tondi, Cristina
Editore: Associazione Italiana di Ingegneria Chimica
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/249055 Collegamento a IRIS

2016
Advances in numerical modelling of swash zone dynamics
COASTAL ENGINEERING
Autore/i: Briganti, Riccardo; Torres Freyermuth, Alec; Baldock, Tom E.; Brocchini, Maurizio; Dodd, Nicholas; Hsu, Tian Jian; Jiang, Zhonglian; Kim, Yeulwoo; Pintado Patiño, Jose Carlos; Postacchini, Matteo
Classificazione: 1 Contributo su Rivista
Abstract: We present a comprehensive and critical review of work on the numerical modelling of swash zone processes between 2005 and 2015. A wide range of numerical models has been employed for the study of this region and, hence, only phase-resolving approaches (i.e., depth-averaged and depth-resolving models) are analyzed. The current advances in the modelling of swash zone processes are illustrated by comparing different numerical models against laboratory experiments of a dam-break-driven swash event. Depth-averaged and depth-resolving models describe well the swash flow for both coarse sand and gravel impermeable beach cases. Depth-averaged models provides a practical tool for engineering use, whereas depth-resolving models improve the flow description, especially for the backwash phase, with a significantly higher computational cost. The evolution and magnitude of bed shear stresses predicted by all models is reasonable when compared with laboratory estimates based on the log-law. However, differences between modelling approaches cannot be rigorously evaluated owing to the uncertainty in shear stress estimates while employing such approximation. Furthermore, small-scale processes, such as turbulence evolution, are investigated with depth-resolving models, finding differences between the two-dimensional and three-dimensional approaches. Numerical models allow us to investigate other processes such as beach morphology changes, the evolution of the turbulence coherent structures, and the infiltration/exfiltration effects on the swash flow. A discussion on the advantages and limitations of each model is presented. The future of swash zone modelling depends on the increase of the computational power and, more importantly, on the improvement of the current capability to obtain intra-wave measurements for model validation, calibration, and greater resolution of physical processes.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/236355 Collegamento a IRIS

2016
Lagrangian Observations of Waves and Currents From the River Drifter
IEEE JOURNAL OF OCEANIC ENGINEERING
Autore/i: POSTACCHINI, MATTEO; Centurioni, L. R.; Braasch, L.; BROCCHINI, MAURIZIO; Vicinanza, D.
Classificazione: 1 Contributo su Rivista
Abstract: The working principle and the capabilities of a new platform called the River Drifter are here presented. This technology has applications in the study of the hydrodynamics of coastal areas, rivers, and lakes. The River Drifter was designed for shallow water applications (1 m and deeper) to collect concurrent measurements of surface currents, three-dimensional velocity profiles underneath the device, water depth, and salinity. Here, we discuss how water level displacements can be inferred and used to measure the swell characteristics and to also correct the measured velocity. We also show how the local vorticity field can be computed. As an example application, we describe a study whose goal was to investigate the fate of a polluted river plume and how two River Drifters initially following the same path are characterized by very different final trajectories. The different behaviors of the two drifters are explained in terms of the local flow dynamics, which are strongly influenced by the seabed morphology, forcing the River Drifters to move in different directions.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/235745 Collegamento a IRIS

2016
Impulse waves generated by snow avalanches: Momentum and energy transfer to a water body
JOURNAL OF GEOPHYSICAL RESEARCH. EARTH SURFACE
Autore/i: Zitti, Gianluca; Ancey, Christophe; Postacchini, Matteo; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: When a snow avalanche enters a body of water, it creates an impulse wave whose effects may be catastrophic. Assessing the risk posed by such events requires estimates of the wave’s features. Empirical equations have been developed for this purpose in the context of landslides and rock avalanches. Despite the density difference between snow and rock, these equations are also used in avalanche protection engineering. We developed a theoretical model which describes the momentum transfers between the particle and water phases of such events. Scaling analysis showed that these momentum transfers were controlled by a number of dimensionless parameters. Approximate solutions could be worked out by aggregating the dimensionless numbers into a single dimensionless group, which then made it possible to reduce the system’s degree of freedom. We carried out experiments that mimicked a snow avalanche striking a reservoir. A lightweight granular material was used as a substitute for snow. The setup was devised so as to satisfy the Froude similarity criterion between the real-world and laboratory scenarios. Our experiments in a water channel showed that the numerical solutions underestimated wave amplitude by a factor of 2 on average. We also compared our experimental data with those obtained by Heller and Hager (2010), who used the same relative particle density as in our runs, but at higher slide Froude numbers.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/247020 Collegamento a IRIS

2016
Experimental study of the short-term efficiency of different breakwater configurations on beach protection
JOURNAL OF OCEAN ENGINEERING AND MARINE ENERGY
Autore/i: LORENZONI, CARLO; POSTACCHINI, MATTEO; BROCCHINI, MAURIZIO; MANCINELLI, ALESSANDRO
Classificazione: 1 Contributo su Rivista
Abstract: A campaign of experimental tests on a 2D movable-bed physical model, reproducing an Italian beach on the Adriatic Sea, has been performed in the wave flume of the “Laboratorio di Idraulica e Costruzioni Marittime” of the Università Politecnica delle Marche (Ancona, Italy), with the aim to assess the fundamental features of various breakwater configurations to be used in a beach-defence system typical of sandy, low-coastline beaches. Three emerged and three submerged configurations of rubble-mound detached breakwaters, for beach protection, placed at different distances from the shore, were tested, as well as a free beach configuration. The short-term hydrodynamic performances of the different configurations were assessed using as forcing some typical real-life intense sea-storm conditions. Wave transmission and beach protection efficiency under various intense wave conditions were obtained and related to some dimensionless parameters, amongst which a recently introduced one, χ, that combines both wave and breakwater properties. Transmission coefficients were found to be about 0.4 for emerged breakwaters and in the range 0.5–0.8 for submerged breakwaters. A net damping coefficient, defined as the wave height decay solely due to the effect of the breakwater, was measured as 0.2 for submerged breakwaters and 0.4 for the emerged ones. Further, submerged breakwaters induce an inshore mean water superelevation that increases with χ, whilst it decreases in the case of emerged breakwaters. Wave transmission is well represented by existing literature relations for both emerged and submerged breakwaters. Emerged breakwaters are more protective than submerged ones, but, at the same time, are more sensitive to changes in structure dimensions or positions. This is confirmed by the analysis of the momentum flux within the nearshore region, which is much larger for the submerged breakwaters. Such structures induce large swash-zone motions and sediment transport, comparable to those occurring at an unprotected beach.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/247212 Collegamento a IRIS

2016
Assessing the Hydro-Morphodynamic Response of a Beach Protected by Detached, Impermeable, Submerged Breakwaters: A Numerical Approach
JOURNAL OF COASTAL RESEARCH
Autore/i: POSTACCHINI, MATTEO; RUSSO, ANIELLO; CARNIEL, SANDRO; BROCCHINI, MAURIZIO
Classificazione: 1 Contributo su Rivista
Abstract: Coastal areas host a large fraction of the world's population and are exposed to natural extreme events, which are a serious threat to human life, as well as to economies. For this reason, sea storms are increasingly the object of studies, and the design of traditional coastal defenses is being carried out in conjunction with modeling analyses. Relying on numerical simulations performed by means of an innovative shallow-water hydro-morphodynamic model, the present work explores the overall response of a protected beach to sea storms. Numerical tests evaluate the effects of sea states extracted from realistic sea storms having different spectral characteristics, as well as the influence on beach morphology of positioning shore-parallel, impermeable, submerged breakwaters. Simulation results revealed that, while erosion/accretion patterns depend weakly on the different sea state conditions, the morphodynamics induced around the barriers is strongly influenced by the breakwaters' positioning. More specifically, at least for the forcing here analyzed, bed variations were shown to increase when the structures are progressively located offshore; on the other hand, the swash zone morphology seems to be only weakly influenced by the positioning of the breakwaters. We also observed that for an increasing extension of the volume over which dissipative breaking mechanisms occur, a decreasing inshore erosion is accompanied by an equally fast decrease of offshore erosion. Analysis of the vorticity fields shows that breakwaters placed far from the shoreline induce an evolution of the vortices generated by breaking waves rather different from the one due to breakwaters placed closer to the shoreline (which can induce seaward flows through the gap, like rip currents).
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/236356 Collegamento a IRIS

2016
Shock trains on a planar beach: quasi-analytical and fully numerical solutions
NATURAL HAZARDS
Autore/i: Soldini, Luciano; Antuono, M.; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/239520 Collegamento a IRIS

2016
Experiments on the impact of snow avalanches into water
Sustainable Hydraulics in the Era of Global Change - Proceedings of the 4th European Congress of the International Association of Hydroenvironment engineering and Research, IAHR 2016
Autore/i: Zitti, G.; Ancey, C.; Postacchini, M.; Brocchini, M.
Editore: CRC Press/Balkema
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: The number of anthropized reservoirs threatened by snow avalanches is steadily increasing and impulse waves caused by avalanche impact are becoming a considerable risk for such basins. The dynamics of the impact of a snow avalanche into a water body is studied through laboratory experiments, where a granular material, with solid density slightly lower than that of the water, is used to simulate the buoyant behaviour of the snow. The proposed experimental model shares many similarities with those used to investigate the impact of landslides into water bodies (e.g., see Fritz et al. 2003a, Fritz et al. 2003b), but it also clarifies the differences between the impact of an avalanche and that of a landslide: while a landslide typically reaches the bottom of the water body, because of its high constant density, in the present experiments a floating motion of the impacted mass has been observed. The wave generation and its propagation are acquired by high-frequency cameras placed along the flume. Some preliminary results on wave amplitude/height decay and on wave celerity state the strongly non-linear behaviour of the generated wave. Further, their comparison with the corresponding predictive relations proposed for the case of landslides (Heller and Hager 2010) highlights a different wave decay and celerity evolution in the proximity of the impact.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/247223 Collegamento a IRIS

2016
60th anniversary special issue on significant advances in coastal engineering
JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING-ASCE
Autore/i: Brocchini, Maurizio; Riggs, H. Ronald
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/244853 Collegamento a IRIS

2016
Sensors for Coastal Monitoring
JOURNAL OF SENSORS
Autore/i: Serafino, F.; Horstmann, J.; Nieto Borge, J. C.; Lugni, C.; BROCCHINI, MAURIZIO
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/235746 Collegamento a IRIS

2015
The EsCoSed Project: Summertime-Wintertime Evolution of the Misa River Estuarine Environment
Atti del XXII Congresso AIMETA
Autore/i: Maurizio BROCCHINI; Joseph CALANTONI; Allen H. REED; Alex SHEREMET; Tracy STAPLES; Joseph SMITH; Matteo POSTACCHINI; Ed BRAITHWAITE; Tim KOONEY; Carlo LORENZONI; Aniello RUSSO; Alessandro MANCINELLI; Luciano SOLDINI; Sara CORVARO; Alessandro COLUCCELLI; Paolo PARONCINI
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/233514 Collegamento a IRIS

2015
Impulse waves generated by snow avalanches falling into lakes
E-proceedings of the 36th IAHR World Congress
Autore/i: Zitti, Gianluca; Ancey, Christophe; Postacchini, Matteo; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: In recent years, the number of water reservoirs in high-altitude areas has increased. They are often used to provide water for various activities related with recreational (i.e. skiing) and production activities. Many of such reservoirs are threatened by snow avalanches. To investigate the phenomenon, an experimental study was carried out at the Ecole Polytechnique Fédérale de Lausanne using a prismatic 3m-long flume. A mass of buoyant particles, initially at rest, was released into a water flume down a 30°-sloping ramp. Its impact with the water surface was analyzed in detail. During the tests, the impacting mass, the water depth in the flume and the ramp length were changed. Both the dynamics of the granular mass at the impact zone and the wave generation induced by the impact were acquired using a high-frequency camera and accurately analyzed. An analysis of the wave propagation along the flume, also captured by two lower-speed cameras, was made by mean of numerical analyses based on a depth-averaged Boussinesq-type model. A theoretical analysis has also been undertaken to assess how the sub-aerial mass dynamics influences energy dissipation, and to identify the key variables of the problem, i.e. the velocity at impact, the shape of the water volume displaced during the impact, the depth of the center of the submerged mass and the percentage of submerged mass.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/247225 Collegamento a IRIS

2015
Morphodynamic shoreline boundary conditions: A preliminary validation from laboratory experiments
Proceedings of the International Offshore and Polar Engineering Conference
Autore/i: Brocchini, Maurizio; Postacchini, Matteo
Editore: International Society of Offshore and Polar Engineers
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: At present the processes occurring in the Swash Zone (SZ) are disregarded by all available wave-averaged nearshore circulation models. Only recently a series of studies has proposed an approach to solve this problem by means of Shoreline Boundary Conditions (SBCs) obtained from integrating the Nonlinear Shallow Water Equations over the SZ width. While hydrodynamic conditions are a consolidated and validated theoretical tool, morphodynamic conditions (MSBCs) still require theoretical inspection and experimental validation. We here focus on a theoretical analysis of the problem, which, on the basis of available experimental data, aims at clarifying the role of short- and long-wave contributions to the mentioned MSBCs.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/247224 Collegamento a IRIS

2015
Scour depth under pipelines placed on weakly cohesive soils
APPLIED OCEAN RESEARCH
Autore/i: POSTACCHINI, MATTEO; BROCCHINI, MAURIZIO
Classificazione: 1 Contributo su Rivista
Abstract: We here study the scouring processes that evolve around a submarine pipeline placed on a weakly cohesive seabed. We first analyze some laboratory tests carried out by Vijaya Kumar et al. [21], Xu et al. [25] and Zhou et al. [28] that focused on the scouring around a horizontal cylinder lying on a cohesive bed, subject to waves and currents. The specific purpose is that of finding a new formula for the prediction of the equilibrium scour depth under submarine pipelines. After a theoretical analysis of the main parameters, the sought formula has been found to be a function of: (i) the hydrodynamic forces acting on the cylinder (through the Keulegan-Carpenter parameter KC), (ii) the clay content of the soil C-c, and (iii) the burial depth eo ID. In the presence of small amounts of clay (C-c< 5%), the scour depth depends directly on KC (as confirmed by many literature works for pipelines lying on sandy soils, e.g.[18]) and inversely on C-c (as already seen for bridge abutments on cohesive soils, e.g. [1]), the best-fit law being characterized by a coefficient of determination R-2 = 0.62. If some burial depth is accounted for, this being a novelty of the present work, a more general formulation can be used, valid in the presence of weakly-cohesive soils and with burial depths of the pipe smaller than 0.5 (R-2 = 0.79). For large clay-content ranges (2% < 75 %), the scour depth depends directly on both KC and C-c, this giving R-2 = 0.79 (no burial depth) and 0.91 (some burial depth). However, this finding is at odds with the main literature, because, for large amounts of clay, it is fundamental to consider the liquidity index LI, which accounts for some important clay properties, like the plasticity. We argue that the absence of LI is balanced by the direct dependence of the scour depth on C-c. Notwithstanding the small number of available data, a formula for the prediction of the scour depth under pipelines lying on cohesive soils is fundamental for several engineering applications. The present contribution represents the first attempt to build such a formula, when the pipeline is subject to the wave-current forcing and the seabed is characterized by a relatively small clay content.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227974 Collegamento a IRIS

2015
Local scour around structures and the phenomenology of turbulence
JOURNAL OF FLUID MECHANICS
Autore/i: MANES, COSTANTINO; BROCCHINI, MAURIZIO
Classificazione: 1 Contributo su Rivista
Abstract: The scaling of the scour depth of equilibrium at the base of a solid cylinder immersed within an erodible granular bed and impinged by a turbulent shear flow is investigated here, for the first time, by means of the phenomenological theory of turbulence. The proposed theory allows the derivation of a predictive formula that (i) includes all the relevant non-dimensional parameters controlling the process, and (ii) contrary to commonly employed empirical formulae, is free front scale issues. Theoretical predictions agree very well with experimental data, shed light on unresolved issues on the physics of the problem, and clarify the effects of various dimensionless parameters controlling the scouring process.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227977 Collegamento a IRIS

2015
Summertime conditions of a muddy estuarine environment: the EsCoSed project contribution
WATER SCIENCE AND TECHNOLOGY
Autore/i: BROCCHINI, MAURIZIO; Calantoni, J.; Reed, A. H.; POSTACCHINI, MATTEO; LORENZONI, CARLO; RUSSO, ANIELLO; MANCINELLI, ALESSANDRO; CORVARO, SARA; MORICONI, GIACOMO; SOLDINI, Luciano
Classificazione: 1 Contributo su Rivista
Abstract: As part of the Estuarine Cohesive Sediments (EsCoSed) project, a field experiment was performed in a highly engineered environment, acting as a natural laboratory, to study the physico-chemical properties of estuarine sediments and the associated hydro-morphodynamics during different seasons. The present contribution focuses on the results obtained from the summertime monitoring of the most downstream part of the Misa River (Senigallia, Italy). The measured hydrodynamics suggested a strong interaction between river current, wave forcing and tidal motion; flow velocities, affected by wind waves traveling upstream, changed significantly along the water column in both direction and magnitude. Surficial salinities in the estuary were low in the upper reaches of the estuary and exceeded 10 psu before the river mouth. Montmorillonite dominated the clay mineral assemblage, suggesting that large, low density flocs with high settling velocities (> 1 mms(-1)) may dominate the suspended aggregate materials.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/226471 Collegamento a IRIS

2015
Advances in fluid mechanics for offshore engineering: a modelling perspective
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A: MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Autore/i: BROCCHINI, MAURIZIO; Faltinsen, O. M.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/205528 Collegamento a IRIS

2015
Gas cavity-body interactions: efficient numerical solution
COMPUTERS & FLUIDS
Autore/i: Colicchio, G.; Greco, M.; Faltinsen, O. M.; BROCCHINI, MAURIZIO
Classificazione: 1 Contributo su Rivista
Abstract: The paper investigates the interactions occurring between a gas cavity, the surrounding liquid and the nearby structures. In more detail, focus is in the characterization of the various dynamical phases (e.g. "acoustic phase" and "gas bubble phase") and in the design of a modelling approach aimed at minimizing the computational efforts needed to analyse the cases of gas cavities spatially close to the target structure. Hence, a domain decomposition (DD) strategy is proposed which enables efficient computations. Hyperbolic flow equations govern the flow evolution and, while the inner domain 1D solution is calculated by means of an HLL scheme for the fluxes and a 1st order time stepping, the outer domain 3D solution is achieved on the basis of a MUSCL scheme coupled with a 3rd order Runge-Kutta time stepping. Various comparative tests, based on use of the full-scale experimental data by Smith (1975), have been used to test the DD strategy. A simplified approach is, finally, proposed to be used for the complex case of multiple cavity explosions. Use of the approach reveals that the worst load scenario for the target structure occurs when all cavities explode simultaneously.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/226134 Collegamento a IRIS

2015
Hydroelastic behaviour of a structure exposed to an underwater explosion
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A: MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Autore/i: Colicchio, G.; Greco, M.; BROCCHINI, MAURIZIO; Faltinsen, O. M.
Classificazione: 1 Contributo su Rivista
Abstract: The hydroelastic interaction between an underwater explosion and an elastic plate is investigated numerically through a domain-decomposition strategy. The three-dimensional features of the problem require a large computational effort, which is reduced through a weak coupling between a one-dimensional radial blast solver, which resolves the blast evolution far from the boundaries, and a three-dimensional compressible flow solver used where the interactions between the compression wave and the boundaries take place and the flow becomes three-dimensional. The three-dimensional flow solver at the boundaries is directly coupled with a modal structural solver that models the response of the solid boundaries like elastic plates. This enables one to simulate the fluid–structure interaction as a strong coupling, in order to capture hydroelastic effects. The method has been applied to the experimental case of Hung et al. (2005 Int. J. Impact Eng. 31, 151–168 (doi:10.1016/j.ijimpeng.2003.10.039)) with explosion and structure sufficiently far from other boundaries and successfully validated in terms of the evolution of the acceleration induced on the plate. It was also used to investigate the interaction of an underwater explosion with the bottom of a close-by ship modelled as an orthotropic plate. In the application, the acoustic phase of the fluid–structure interaction is examined, highlighting the need of the fluid–structure coupling to capture correctly the possible inception of cavitation.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/205529 Collegamento a IRIS

2015
Turbulence in Rivers
Rivers – Physical, Fluvial and Environmental Processes
Autore/i: Franca, M.; BROCCHINI, MAURIZIO
Editore: Springer International Publishing Switzerland
Luogo di pubblicazione: Cham, Heidelberg, New York, Dordrecht, Lndon
Classificazione: 2 Contributo in Volume
Abstract: The study of turbulence has always been a challenge for scientists working on geophysical flows. Turbulent flows are common in nature and have an important role in geophysical disciplines such as river morphology, landscape modeling, atmospheric dynamics and ocean currents. At present, new measurement and observation techniques suitable for fieldwork can be combined with laboratory and theoretical work to advance the understanding of river processes. Nevertheless, despite more than a century of attempts to correctly formalize turbulent flows, much still remains to be done by researchers and engineers working in hydraulics and fluid mechanics. In this contribution we introduce a general framework for the analysis of river turbulence. We revisit some findings and theoretical frameworks and provide a critical analysis of where the study of turbulence is important and how to include detailed information of this in the analysis of fluvial processes. We also provide a perspective of some general aspects that are essential for researchers/practitioners addressing the subject for the first time. Furthermore, we show some results of interest to scientists and engineers working on river flows.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/234417 Collegamento a IRIS

2015
Whole-wavelength description of a wave boundary layer with permeable wall
EXPERIMENTS IN FLUIDS
Autore/i: Miozzi, M.; Postacchini, Matteo; Corvaro, Sara; Brocchini, Maurizio
Classificazione: 1 Contributo su Rivista
Abstract: This paper describes the whole-wavelength, highly resolved velocity field statistics in an oscillatory boundary layer driven by gravity waves, evolving on both impermeable and permeable beds. Velocity data from PTV measurements are acquired in a small window and then extended to the whole wavelength by means of a new phase-locked slotting technique. This technique increases the robustness of statistics and resolution by improving the number of the data samples available for each spatial cell in the Eulerian representation of the oscillatory boundary layer. The into-and out-of-bed volume flux is evaluated and its effects on the velocity field are reported, together with its influence on vorticity evolution. The presence of coherent structures embedded in a shear-dominated scenario is emphasized. The Lagrangian flow features extracted by PTV are presented in the context of the generalized Lagrangian-mean theory. The Stokes drift vertical profile is estimated by comparing the Eulerian and Lagrangian velocities. A critical height-separating region where the volume flux due to ventilation has different effects on both orbital amplitudes and Stokes drift is found. This distance corresponds to the maximum height of the still-attached vorticity layer.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/227975 Collegamento a IRIS

2014
Whole-wavelength description of a gravity-wave-driven flow over permeable beds
Proceeding of the "17th International Symposium on Applications of Laser Techniques to Fluid Mechanics"
Autore/i: Miozzi, Massimo; Corvaro, Sara; Postacchini, Matteo; Brocchini, Maurizio
Editore: Instituto Superior Tecnico, Lisboa, Portugal
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/233411 Collegamento a IRIS

2014
Uno studio a scala naturale dell'idro-morfodinamica estuarina: esperimenti di campo alla foce del fiume Misa
XXXIV Convegno Nazionale Idraulica e Costruzioni Idrauliche
Autore/i: Brocchini M.; Colantoni J.; Postacchini M.; Reed A.H.; Lorenzoni C.; Mancinelli A.; Soldini L.; Corvaro S.; Russo A.; Moriconi G.; Coluccelli A.; Paroncini P.; Ortenzio F.; Busca C.
Editore: Zaccaria Editore
Luogo di pubblicazione: Napoli
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/205867 Collegamento a IRIS

2014
A shallow-water sloshing model for wave breaking in rectangular tanks
JOURNAL OF FLUID MECHANICS
Autore/i: Antuono M.; Bardazzi A.; Lugni C.; Brocchini M.
Classificazione: 1 Contributo su Rivista
Abstract: We propose a simple, robust and efficient sloshing model that accounts for breaking phenomena evolving in rectangular tanks and in shallow-water conditions. The model has been obtained by applying Fourier analysis to Boussinesq-type equations and using an approximate analytic solution for the vorticity generated by wave breaking. The toe of the breaker and the intensity of the vorticity injected at the free surface are computed on the basis of literature results for coastal-type breakers. A first experimental campaign has been used to calibrate the turbulent viscosity of the sloshing model, while a second campaign has been run as final validation. The overall good agreement between the numerical outputs and the experimental data confirms the reliability and robustness of the proposed model.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/196706 Collegamento a IRIS

2014
Flow dynamics on a porous medium
COASTAL ENGINEERING
Autore/i: S. Corvaro; E. Seta; A. Mancinelli; M. Brocchini
Classificazione: 1 Contributo su Rivista
Abstract: In this paper, which can be regarded as a companion of that by Corvaro et al. (2010), experimental results on the internal flow kinematics of waves which propagate on different types of beds, focusing on the nearbed dynamics induced by a porous bed, are illustrated and analyzed. The porous bed induces a major attenuation in the upstream-to-downstream direction of both wave height (≈ 30%) and internal flow velocity (≈ 50% for the maximum and minimum phases). The relationship between the wave height and the internal flow attenuation has been analyzed by means of wave energy arguments. We also found that the averaged reduction of mean flow between the smooth and porous-bed cases is approximately of 45% and 55%, respectively, for the horizontal and vertical velocity components. The stronger reduction of the vertical velocity is due to a significant variation of this velocity profile with respect to what occurs on an impermeable bed. An optical technique is used to extract the flow velocity from suitable video images; the wave dynamics on the porous medium is analyzed by evaluating the mean wave flow, the turbulence and the vorticity fields over the layer. The turbulence, indirectly characterized in terms of instantaneous velocity spectra, is found to be largely confined within the bottom boundary layer, located at a position deeper than the peaks of the mean flow. From the analyses of the instantaneous velocity spectra a clear anisotropy and inhomogeneity are found for the nearbed turbulence. This is confirmed by the presence, in the bottom boundary layer, of elongated coherent vortical structures whose intensity is the maximum during the wave crest and trough phases.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/184304 Collegamento a IRIS

2014
A natural-scale study of cohesive sediment transport: The Misa River case
RIVER FLOW 2014 - Proceedings of the International Conference on Fluvial Hydraulics
Autore/i: Brocchini M.; Russo A.; Calantoni J.; Reed A.H.; Postacchini M.; Lorenzoni C.; Corvaro S.; Mancinelli A.; Moriconi G.; Soldini L.
Editore: CRC Press
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/205869 Collegamento a IRIS

2014
Modeling and Analysis of an Electrically Actuated Microbeam Based on Nonclassical Beam Theory
JOURNAL OF COMPUTATIONAL AND NONLINEAR DYNAMICS
Autore/i: Belardinelli P.; Lenci S.; Brocchini M.
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/155109 Collegamento a IRIS

2014
Vorticity generation due to cross-sea
JOURNAL OF FLUID MECHANICS
Autore/i: M. Postacchini; M. Brocchini; L. Soldini
Classificazione: 1 Contributo su Rivista
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/166702 Collegamento a IRIS

2014
A wave-by-wave analysis for the evaluation of the breaking-wave celerity
APPLIED OCEAN RESEARCH
Autore/i: Postacchini M.; Brocchini M.
Classificazione: 1 Contributo su Rivista
Abstract: The paper gives an overall description of the breaking-wave celerity on the basis of a wave-by-wave analysis that has been performed by using field data collected during the ECORS Project (Truc Vert Beach, France, 2008). Data coming from two pressure sensors have been analyzed with the aim to correlate, after a zero-crossing analysis, each wave of both signals. The method is based on a first correlation between 10 ' time windows of both signals and, then, on the individuation of the correct time lag for each wave. Such data, which reveals a quasi-gaussian behavior of the breaking wave celerity, have also been used to relate the wave celerity with suitable wave characteristics, and comparisons are made with the most common formulas that can be found in the literature. The wave-by-wave method, validated by means of suitable laboratory test data, gives good results in the evaluation of the celerity, especially when it is made to depend on both a velocity scale and the wave non-linearity parameter. Further, a comparison with literature models used for the prediction of breaking wave celerity suggests good performances of both solitary-wave (correlation coefficient R-2 = 0.79) and shock-wave (R-2 = 0.71) theories, that give results well matched to the field data.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/188303 Collegamento a IRIS

2014
Fluid-particle interaction and generation of coherent structures over permeable beds: an experimental analysis
ADVANCES IN WATER RESOURCES
Autore/i: S. Corvaro; M. Miozzi; M. Postacchini; A. Mancinelli; M. Brocchini
Classificazione: 1 Contributo su Rivista
Abstract: We study the dynamics of the oscillatory bottom boundary layer (BBL) that develops at a porous bed under the action of propagating water waves (also known as “ventilated BBL”). In particular, experimental tests of a ventilated BBL generated over a permeable bed made of regular plastic spheres are analysed. With the purpose of characterizing typical dynamics of nearshore waves evolving over dissipative seabeds, we focus on one specific forcing condition, characterized by large nonlinearities and vorticity generation, and expect that such dynamics be qualitatively similar also for other wave regimes. Particle tracking enables an accurate definition of the hydrodynamics generated over the porous medium with specific focus on Eulerian velocity and vorticity fields and on Lagrangian particle trajectories. Nearbed velocity components are strongly influenced by the bed configuration (sphere caps) and are characterized by small-scale oscillations due to the presence of coherent structures over the interstices. Counter-rotating vortex sheets are generated and evolve during the entire wave period; their thickness grows rapidly when flow injection from the bed occurs, while it remains constant under the influence of in-bed flow suction. The evolution of near-bed particles is influenced by strain or vortex-dominated regions. When the intensity of the vortices just outside the BBL is large (generally after flow inversion), the momentum associated to the rotation of the lower layer of vortices in the BBL is comparable with that of the passive tracers, hence the particles are captured and their original trajectories are modified, jumping to a different layer. On the contrary when strain regions are dominant, particles are restricted in the same vorticity layer until sweep or ejection turbulent processes are observed and anomalous particle transport occurs from lower to higher vortex layers and vice versa. The latter occurs during the entire wave cycle, becoming the dominant process, while the former occurs before flow inversion and close to the porous bed. This result reveals that nearbed small-scale phenomena are weakly influenced by the wave mean flow. A detailed description of fluid suction and injection is proposed in terms of the mean flow dynamics (at wave scale), while the actual inflow/outflow of particles at the bed is seen to depend on local, small-scale flow properties. Suction and injection are generated during positive and negative water surface elevations and either squeeze or expand the flow downward/upward. The suction/injection perturbations contribute to the triggering of sweep and ejection events. Suction is mainly concentrated very close to the bed, injection is rapidly transported above the BBL, but the highest turbulence occurs in correspondence of suction events.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/184303 Collegamento a IRIS

2014
Sediment transport and morphodynamics generated by a dam-break swash uprush: Coupled vs uncoupled modeling
COASTAL ENGINEERING
Autore/i: Postacchini M.; Othman I.K.; Brocchini M.; Baldock T.E.
Classificazione: 1 Contributo su Rivista
Abstract: The present work analyzes the hydro-morphodynamics characterizing the swash region during the uprush stage. A comparison is illustrated between the sediment transport measured in a series of dam-break experiments and that predicted by the numerical hydro-morphodynamic model of Postacchini et al. (2012). The primary aim is to investigate the differences arising between the weakly coupled or uncoupled model and the measurements, in terms of hydrodynamics, tip celerity and sediment transport. The hydrodynamics are well described by the model and results have been used to calibrate both friction factor and subgrid turbulent viscosity. Comparison of numerically-computed tip celerity with experimental data reveals a fairly good agreement, i.e. a mean error of about 10%, while modeled sediment transport differs by about 40% from the available data. No evident differences are found between results obtained from the coupled and uncoupled model runs (2% for the celerity and 11% for the sediment transport rate at the tip), suggesting that for the specific flow under investigation, at the leading edge of the swash front, hydro-morphological coupling is not an issue of fundamental importance. However, for the special case here of a swash forced by a dam-break, scour occurs at the dam location, and in this case the erosion of the bed is significantly larger in the uncoupled model.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/188304 Collegamento a IRIS

2013
Fluid-particle interaction and generation of coherent structures over permeable beds: an experimental analysis
Proceedings of "Two-Phase Modelling for Sediment Dynamics In Geophysical Flows" - THESIS-2013 -S.H.F.
Autore/i: Postacchini M.; Corvaro S.; Miozzi M.; Mancinelli A.; Brocchini M.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/164730 Collegamento a IRIS

2013
A natural-scale analysis of estuarine cohesive sediments: the EscoSed project
8th international SedNet conference - Innovative sediment management: how to do more with less
Autore/i: Brocchini M.; Calantoni J.; Postacchini M.; Reed A.H.; Lorenzoni C.; Russo A.; Mancinelli A.; Corinaldesi V.
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/164733 Collegamento a IRIS

2013
The hydro-morphodynamic response of a protected beach subject to sea storms: a numerical study
PROCEEDINGS OF THE 35TH IAHR WORLD CONGRESS, VOLS III AND IV
Autore/i: Postacchini, Matteo; Russo, Aniello; Sandro Carniel; Brocchini, Maurizio
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Abstract: Sea storms are becoming more and more important in the economy of coastal areas, because they heavily affect both maintenance and life of the defense/touristic facilities, especially if they take place during the summer period. In conjunction with this, the design of traditional coastal defense structures is crucial for the protection of such facilities. The present study, based on numerical simulations performed by means of an innovative shallow-water numerical hydro-morphodynamic solver, explores the overall response of a protected beach to sea storms. Numerical tests have been run with the purpose of evaluating both i) the effect of real-life sea storms with different spectral characteristics, and ii) the influence of the positioning of shore-parallel submerged breakwaters on the beach morphology. The results of the simulations have revealed that erosion/accretion patterns depend weakly on the different sea storm conditions here used. On the other hand, the morphodynamics induced around the barriers is strongly influenced by the breakwater positioning: for the forcing here analyzed, the more the structures are offshore located, the more the bed variation is intense. On the opposite, the swash zone morphology is weakly influenced by the positioning of the breakwaters.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/247226 Collegamento a IRIS

2013
A Novel Two-fluid Model for the Identification of Possible Multiple Solutions in Slightly Inclined Pipelines
INTERNATIONAL JOURNAL OF NONLINEAR SCIENCES AND NUMERICAL SIMULATION
Autore/i: Corvaro S.; Brocchini M.
Classificazione: 1 Contributo su Rivista
Abstract: A novel mechanistic two-fluid model (CB model) similar, in spirit, to the Taitel and Dukler [1, 2] (TD model), for the identification of possible multiple solutions of a multi-phase (gas-liquid) stratified flow in slightly inclined pipelines, is proposed. While Blasius-type closures are used in the TD model to represent the wall friction coefficients, the newly-implemented CB model makes use of Colebrook-White-type closures. Moreover, different closures for the interfacial shear are also employed in the CB models. The predictive capabilities of the CB model have been tested by using several experimental data, finding a better agreement between measured and calculated data than that existing when the TD model is used. The region of multiple solutions is influenced by the closures in use, such a dependence is more evident when different interfacial friction factors are used. Moreover, for the CB model also the fluid mixture in use influences the boundaries of the non-uniqueness region, while by using the TD model the multiple-solution region is unchanged. The choice of closures for the interfacial friction strongly influences the holdups, the Andritsos and Hanratty [10] correlation significantly shifting the non-uniqueness region to small values of the inclination parameter. Such a behaviour is more and more significant with the increase of the superficial gas velocity, even if for values of the inclination parameter within the range of inclinations for stratified flows (i.e. less than about 30° from the horizontal [11]), multiple solutions were not found. Finally, for the fluid mixture and flow conditions analyzed, multivalued solutions are obtained only for upward flows. Moreover, the portion of multiple-solution region interested by co-current flow (that occurs for slightly upward and downward pipes) is rather small, so that the operational point unlikely falls within such a region in the case of the studied hydrocarbon gas-liquid mixture.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/88582 Collegamento a IRIS

2013
Bore-generated macrovortices on erodible beds
JOURNAL OF FLUID MECHANICS
Autore/i: M. Brocchini
Classificazione: 1 Contributo su Rivista
Abstract: The interaction of free-surface bores and an erodible porous channel bed in a shallow-water flow is analysed based on the assumption of weak coupling between free-surface discontinuities and bed discontinuities and on the simplest closure for the sediment transport rate (cubic with the mean flow velocity). It is shown that free-surface bores with finite cross-stream extent can evolve over the erodible bed by generating vertically oriented macrovortices in a manner similar to, but more complex than, that of free-surface bores of finite cross-stream extent over a rigid channel bottom. An equation for the potential vorticity is derived, which shows that on an erodible bed the vortices are generated by a combination of various mechanisms related to energy dissipation of both surface bores and bed discontinuities. The model is verified and the physics explored by comparison with a number of numerical simulations, typical of both riverine (dam-break test and pit test) and nearshore (bore on a beach test) flows, and with previously published experimental results. For all cases a fairly good agreement is found between the analytically estimated potential vorticity and that computed numerically.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/122262 Collegamento a IRIS

2013
A reasoned overview on Boussinesq-type models: the interplay between physics, mathematics and numerics
PROCEEDINGS - ROYAL SOCIETY. MATHEMATICAL, PHYSICAL AND ENGINEERING SCIENCES
Autore/i: M. Brocchini
Classificazione: 1 Contributo su Rivista
Abstract: This paper, which is largely the fruit of an invited talk on the topic at the latest International Conference on Coastal Engineering, describes the state of the art of modelling by means of Boussinesq-type models (BTMs). Motivations for using BTMs as well as their fundamentals are illustrated, with special attention to the interplay between the physics to be described, the chosen model equations and the numerics in use. The perspective of the analysis is that of a physicist/engineer rather than of an applied mathematician. The chronological progress of the currently available BTMs from the pioneering models of the late 1960s is given. The main applications of BTMs are illustrated, with reference to specific models and methods. The evolution in time of the numerical methods used to solve BTMs (e.g. finite differences, finite elements, finite volumes) is described, with specific focus on finite volumes. Finally, an overview of the most important BTMs currently available is presented, as well as some indications on improvements required and fields of applications that call for attention.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/122063 Collegamento a IRIS

2013
Dynamical characteristics of an electrically actuated microbeam under the effects of squeeze-film and thermoelastic damping
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
Autore/i: P. Belardinelli; M. Brocchini; L. Demeio; S. Lenci
Classificazione: 1 Contributo su Rivista
Abstract: The static and dynamic behavior of a MEMS subjected to thermoelastic and squeeze-film effects is investigated. We analyse the various engineering aspects which interact in a slender fixed–fixed microbeam; major attention is devoted to the modeling of such a multiphysics system, including the mechanical, electrical, thermoelastic and fluid-dynamic properties with their couplings. The static solution is obtained numerically by a finite-difference technique. The variation of the static deflection with respect to the voltage increment, in the presence of geometric nonlinearites, is studied first. Numerical results on the magnitude of thermoelastic damping (TED) and squeeze-film damping are obtained and examined with a parametric analysis. The effect of different relaxation times imposed on the TED, both in pull-in and non pull-in regime, is studied. The squeeze-film damping is modeled by means of the Reynolds equation and the large pressure regime is investigated. We then present a comparison between the different sources of damping, evaluating their relative contribution to the system.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/107262 Collegamento a IRIS

2013
Numerical modeling of the influence of the beach profile on wave run-up
JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING-ASCE
Autore/i: L. Soldini; M. Antuono; M. Brocchini
Classificazione: 1 Contributo su Rivista
Abstract: An analysis of the run-up over different beach profiles is performed to evaluate the influence of the seabed shape on shore flooding. The analysis was carried out on the basis of numerical solutions of the nonlinear shallow water equations. The chosen solver was shown to provide reliable (both quantitatively and qualitatively) run-up results by comparing numerical solutions (of both solitary and regular waves) with the only available analytical solution forced by a localized topographic change. The run-up patterns on both a natural beach profile and three simpler and schematic profiles derived from it were evaluated. Different wave conditions (both random and groups) were used for a total amount of 96 different cases of inundation. Results are expressed in terms of both maximum (Zmax) and steady-state (Zsteady) run-up. It is found that both types of run-up depend on the offshore variable sqrt(H0L0), as suggested by several available studies, and that, for all tested cases, random waves induce the largest Zmax compared with the wave groups. The largest Zmax is induced by the composite-planar profile for both random waves and groups. An important similarity is found for both Zmax and Zsteady induced by all wave types over the natural and equilibrium profiles, giving further support to the use of an equilibrium profile as representative of the natural profile. Attempts at finding an equivalent planar beach highlight unavoidable difficulties in choosing such a profile and reinforce the idea that the concept of an equivalent planar beach cannot bridge dynamics occurring from the depth of closure to the run-up. More likely, such a concept is only suitable to describe dynamics that are local to the foreshore.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/82212 Collegamento a IRIS

2013
Beyond Boussinesq-type equations: Semi-integrated models for coastal dynamics.
PHYSICS OF FLUIDS
Autore/i: M. Antuono; M. Brocchini
Classificazione: 1 Contributo su Rivista
Abstract: A novel approach for the description of both wave propagation and flow circulation in the nearshore zone has been defined. This is based on an integro-differential system which, at the leading-order, coincides with classical depth-averaged models (e.g., Boussinesq-type models) and, in addition, describes flow deviations from the depth-averaged values. Thanks to this feature, the proposed system enables exact calculation of the linear dispersion relation, of the linear shoaling coefficient, and of second-order nonlinear solutions for monochromatic waves. A simplified version of the original system has also been proposed. This latter model is exact up to the first order and predicts a linear shoaling coefficient which is comparable with the most advanced, fully nonlinear Boussinesq-type models. The general approach, which can be exploited to obtain a family of models, has clear computational advantages over those which solve the flow over the vertical and improves the flow description accuracy of typical depth-averaged models.
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/86368 Collegamento a IRIS

2013
Transversal and longitudinal mixing in compound channels.
WATER RESOURCES RESEARCH
Autore/i: G. Besio; A. Stocchino; S. Angiolani; M. Brocchini
Classificazione: 1 Contributo su Rivista
Abstract: An experimental campaign, based on particle image velocimetry (PIV) measurements of free-surface velocities, forms the basis for an analysis of the mixing processes which occur in a compound-channel flow. The flow mixing is characterized in terms of Lagrangian statistics (absolute dispersion and diffusivity) and of the related mean flow characteristics. Mixing properties strongly depend on the ratiorh between the main channel flow depth (h*mc) and the floodplain depth (h*fp), and three flow classes can be identified, namely shallow, intermediate, and deep flows. In the present study the large time asymptotic behavior of the mixing characteristics is analyzed in terms of the absolute diffusivity in order to characterize typical values of longitudinal and transversal diffusivity coefficients. Various sets of experiments, which cover a wide range of the governing physical parameters, have been performed and the asymptotic values of the absolute diffusivity have been evaluated. The results are then compared with several studies of flow dispersion for both the longitudinal diffusivity coefficient and the transversal turbulent mixing coefficient. The present results highlight a stronger dependence of such coefficients with the flow-depth ratio than with the flow regime (Froude number).
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/86369 Collegamento a IRIS

2013
Experimental investigation of the wave-induced flow around a surface-touching cylinder
JOURNAL OF FLUIDS AND STRUCTURES
Autore/i: M. Mattioli; A. Mancinelli; M. Brocchini
Classificazione: 1 Contributo su Rivista
Abstract: The wave-induced flow around a circular cylinder near both a rigid wall and an erodible bed is experimentally investigated using Particle Tracking Velocimetry (PTV). The aim of this study is to gain quantitative information on the local mean flow, the vorticity dynamics and the evolution of the erodible bed. The flow is characterized in terms of the Keulegan–Carpenter (KC), Reynolds (Re) and Ursell (Ur) numbers. The effects of changing these parameters over the ranges 1Scheda della pubblicazione: https://iris.univpm.it/handle/11566/86367 Collegamento a IRIS

2012
Un'analisi preliminare sul ruolo della vegetazione nell'idrodinamica dei canali a sezione composta
Atti del XXXIII Convegno Nazionale di Idraulica e Costruzioni Idrauliche
Autore/i: Soldini L.; Postacchini M.; Brocchini M.
Editore: EdiBios, Cosenza, Italia
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/80053 Collegamento a IRIS

2012
The morphological response of beaches protected by different breakwater configurations
Proc. 33rd Int. Conf. Coast. Engng-ASCE
Autore/i: C. Lorenzoni; M. Postacchini; A. Mancinelli; M. Brocchini
Classificazione: 4 Contributo in Atti di Convegno (Proceeding)
Scheda della pubblicazione: https://iris.univpm.it/handle/11566/107265 Collegamento a IRIS




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