Papers by Mariano Buccino
Water
Onshore wind significantly affects wave run-up and overtopping, thereby representing a major vari... more Onshore wind significantly affects wave run-up and overtopping, thereby representing a major variable to account for in the design process. The aim of this study is to analyze the ability of numerical models to properly reproduce the wind effect on the overtopping at vertical seawall and to use them to understand how the wind influences the overtopping process as well. We use the RANS model, FLOW-3D, and the NLSW model, SWASH; both model the action of wind through the shear stress that it exerts on the sea surface. Although a simplified modelling of wind has been adopted, the CFD model has led to physically consistent results. On the other hand, SWASH seems to be unsuitable for reproducing the enhancement of the overtopping rate due to wind. CFD numerical results show that the wind affects only the lower overtopping regime (i.e., q < 1 l/s/m); as the mean overtopping discharge decreases, the influence of wind increases. Specifically, wind plays a key role in pure “white overtoppi...
This paper discusses preliminary results of a wide experimental campaign carried out in the frame... more This paper discusses preliminary results of a wide experimental campaign carried out in the frame of a collaboration between the Government of the isle of Cuba and the CUGRI consortium, an Italian institution which joins the Universities of Salerno and Napoli Federico II. The tests were aimed to analyze the performances of different solutions designed to reduce the overtopping of the Malecòn, a vertical face seawall protecting the northern waterfront of the city of La Habana. The shallow foreshore in front of the structure allowed assessing the role of wave setup and low frequency components of the incoming wave spectrum on the predictions of the mean overtopping rate.
One of the most interesting characteristics of the Wave Energy Converters (WEC) based on the over... more One of the most interesting characteristics of the Wave Energy Converters (WEC) based on the overtopping principle is their capability of being integrated into conventional harbor structures. However, in these cases Particular attention must be drawn to the structural stability and the nature of loadings exerted on the device. This paper presents CFD experiments on a composite breakwater including an upright section and a sloping crown simulating a WEC. The hydrodynamic forces caused by the overtopping process onto the inner face of the structure are analyzed, with a Particular focus on the impulsive events
Se presentan los estudios de estabilidad realizados en modelo fisico a estructuras de defensa cos... more Se presentan los estudios de estabilidad realizados en modelo fisico a estructuras de defensa costeras obtenidas de una amplia campana experimental para definir la solucion de defensa costera del Malecon Tradicional de La Habana. Se realizo un estudio preliminar a rompeolas conformada su coraza con rocas, como resultado se comprobo el fallo de la estructura. Se llevo a cabo el rediseno de los rompeolas de baja cresta y bermas emergidas utilizando como elementos para la coraza cubos de hormigon. Como resultado de las pruebas las bermas emergidas fallan para los mayores oleajes. En el caso de los rompeolas su fallo esta asociado a la localizacion en la zona de rompiente. Se recomienda aplicar un elemento de mayor interconexion, y prestar atencion a la proteccion del pie de las estructuras.
Se presenta parte de una campana experimental aplicando la modelacion fisica para obtener una sol... more Se presenta parte de una campana experimental aplicando la modelacion fisica para obtener una solucion en la reduccion del sobrepaso del oleaje en el Malecon Tradicional de La Habana. La evaluacion de la situacion actual (muro vertical, MV), fue llevada a cabo mediante la reduccion de la tasa media y comparando con la tasa media admisible de descarga de 50 L/sm. Esto confirmo que la variante de elevacion de la cota de corona del MV genera los mejores resultados para las condiciones estudiadas de clima maritimo y las restricciones tecnicas impuestas con valores de reduccion de 31.5% y 29,8% para 50 anos de periodo de retorno; y 22,5% y 24,24% para el huracan Wilma. Ademas, se comparan los resultados con modelo deterministico presentado en el manual Eurotop 2007.
Goldschmidt2021 abstracts, 2021
Bagnoli-Coroglio is an urban district of the city of Napoli, which has been the site of heavy ind... more Bagnoli-Coroglio is an urban district of the city of Napoli, which has been the site of heavy industrialization for nearly one century. In the late '900s, it was classified by the Italian Government as a site to be remediated and restored to its natural beauty. This gave rise to intense research work, which culminated in the project ABBaCo, targeting the expertise of scientists from different fields, towards innovative solutions for the environmental recovery of the site [1]. Within the ABBaCo's frame, a collaboration has been established between researchers of the University of Naples Federico II and those of the Italian Institute of Geophysics and Volcanology, aimed to individuate the possible sources of the contamination by arsenic, affecting marine sediments. Attention has been drawn to the role of the Agnano Effluent, a channel outfalling at the westernmost part of the Bagnoli coast, which conveys to the sea the water of a number of hot springs, originating at the volcanic Agnano area. Differently from other studies, which used statistically based approaches [2], this research has been carried out via numerical simulations. The numerical study encompasses either the analysis of the flow regime at the bay or the detailed simulation of transport, dispersion, diffusion and settling of the released arsenic. Results of the research reveal that a primary role in the As advection could be played by a rip current system, which takes place under both NE and SE winds and borders the high As contamination contour (Figure 1). Good agreement has been found between As measurements and simulations, especially under SW winds accompained by mild wave attacks (Figure 2).
Journal of Hydrology, 2020
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Ocean Engineering, 2019
Walkden et al. (2001) showed that severe impact events could be generated at the inner face of a ... more Walkden et al. (2001) showed that severe impact events could be generated at the inner face of a sloping top caisson breakwater, as a consequence of violent wave overtopping. The authors employed the pressure impulse theory proposed by Cooker and Peregrine (1995), to develop a method capable of predicting the magnitude and distribution of loadings at the wall. It was finally recognized air trapped between the overtopping jet and the structure to have a primary role in transferring momentum to the free surface of the protected basin. Unfortunatey, that pioneering study was carried out using only 3 individual waves, with identical height and period; accordingly, no systematic analysis of this fascinating phenomenon could be provided. This paper employs results of full scale CFD experiments to fill this gap. The research outcomes, consistent with the Walkden et al. (2001) findings, suggest that the occurrence of impulsive loadings at the inner face of the breakwater is intimately correlated to the occurrence of impact pressures onto the outer wall, due to breaking waves. A physically based correction of the Walkden et al. theory has been proposed, which allows to get reasonable estimates of the pressure impulse under both quasi standing and breaking waves. This paper employs the full scale CFD experiments described in Buccino et al. (2019) to start filling those gaps. After a qualitative description of the mechanisms that govern impacts occurrence (Section 2), a quantitative analysis is provided in the Subsection 3.2. Then, predictability is studied in the frame of a probabilistic approach (Subsection 3.3). After analyzing the pressure distribution characteristics, with a special focus on the role of air entrainment (Subsection 3.4), a comparison with the Walkden et al.
Sustainability, 2016
This paper constructs an optimal configuration assessment, in terms of the financial returns, of ... more This paper constructs an optimal configuration assessment, in terms of the financial returns, of the Overtopping BReakwater for wave Energy Conversion (OBREC). This technology represents a hybrid wave energy harvester, totally embedded in traditional rubble mound breakwaters. Nine case studies along the southern coast of Western Australia have been analysed. The technique provides tips on how to estimate the quality of the investments, for benchmarking with different turbine strategy layouts and overlapping with the costs of traditional rubble mound breakwaters. Analyses of the offshore and nearshore wave climate have been studied by a high resolution coastal propagation model, forced with wave data from the European Centre for Medium-Range Weather Forecasts (ECMWF). Inshore wave conditions have been used to quantify the exploitable resources. It has been demonstrated that the optimal investment strategy is nonlinearly dependent on potential electricity production due to outer technical constraints. The work emphasizes the importance of integrating energy production predictions in an economic decision framework for prioritizing adaptation investments.
Despite low crested breakwaters are worldwide used for protecting coastal areas, the shoreline re... more Despite low crested breakwaters are worldwide used for protecting coastal areas, the shoreline response to their placement appears still little predictable. In the authors opinion, this may be due to a lack of knowledge about the transformations induced by the structures on the hydraulic parameters which govern the response of the protected beach. Based on results of large scale experiments, the paper examines some of these transformations, including wave energy distribution in the transmitted spectrum and variation of the cross-shore “beach response parameters”(Kraus, 1992).
ABSTRACT SOMMARIO Per la progettazione delle scogliere a cresta bassa particolare attenzione deve... more ABSTRACT SOMMARIO Per la progettazione delle scogliere a cresta bassa particolare attenzione deve essere rivolta alla determinazione della quota di sommità. In tal senso, l&#39;esigenza di garantire che l&#39;agitazione ondosa nell&#39;area protetta sia contenuta entro limiti compatibili con gli obiettivi di progetto, costituisce il più importante dei vincoli da rispettare. Tuttavia le formule generalmente adoperate per la stima della trasmissione ondosa non sono state a tutt&#39;oggi sufficientemente verificate. A tal fine è stata condotta un&#39;indagine sperimen-tale in grande scala presso il Grosser Wellenkanal di Hannover in Germania. Le d i-mensioni del modello, prossime a quelle di prototipo, hanno consentito di minimizzare gli effetti scala connessi principalmente con il frangimento delle onde. L&#39;analisi preli-minare dei dati sperimentali mostra come questi siano in ragionevole a ccordo con la formula di d&#39;Angremond et al. (1996). L&#39;analisi ha inoltre evidenziato una significativa influenza della larghezza della cresta e dell&#39;indice di frangimento sul fenomeno di tra-smissione ondosa.
In the view of the growing interest in submerged breakwaters for beach erosion control, a detaile... more In the view of the growing interest in submerged breakwaters for beach erosion control, a detailed analysis on their hydraulic response is needed. In this study attention has been drawn to the rise of the mean water level in the protected area. Using a nearly 300 tests wide data base, a model previously presented by the authors for an idealized
Coastal Structures 2007, 2009
Coastal Engineering 2002 - Solving Coastal Conundrums - Proceedings of the 28th International Conference, 2003
WAVE HEIGHTS DISTRIBUTION IN THE SURF ZONE: ANALYSIS OF EXPERIMENTAL DATA Mariano Buccino1 and Ma... more WAVE HEIGHTS DISTRIBUTION IN THE SURF ZONE: ANALYSIS OF EXPERIMENTAL DATA Mariano Buccino1 and Mario Calabrese2, Abstract: A semi-empirical model is developed for prediction of wave heights pel/in shallow waters. It assumes that a single Weibull ...
Coastal Structures 2007 - Proceedings of the 5th Coastal Structures International Conference, CST07, 2009
Ocean Engineering, 2008
In addition to reducing the incoming wave energy, submerged breakwaters also cause a setup of the... more In addition to reducing the incoming wave energy, submerged breakwaters also cause a setup of the sea level in the protected area, which is relevant to the whole shadow zone circulation, including alongshore currents and seaward flows through the gaps. This study examines such a leading hydraulic parameter under the simplified hypothesis of 2D motion and presents a prediction model that has been validated by a wide ensemble of experimental data. Starting from an approach originally proposed by Dalrymple and Dean [(1971). Piling-up behind low and submerged permeable breakwaters. Discussion note on Diskin et al. (1970). Journal of Waterways and Harbors Division WW2, 423-427], the model splits the rise of the mean water level into two contributions: one is due to the momentum flux release forced by wave breaking on the structure, and the other is associated with the mass transport process. For the first time, the case of random wave trains has been explicitly considered.
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Papers by Mariano Buccino