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12 results on '"Barbariol, Francesco"'

1. Large waves and drifting buoys in the Southern ocean

Author

Barbariol Francesco and Cavaleri Luigi

Subjects
measuring waves, moored and drifting buoys, wind waves, Physics::Atmospheric and Oceanic Physics
Abstract

In July 2017 a wave measuring buoy located south of New Zealand broke its mooring and started drifting, still transmitting the essential information. During its short mooring period it also measured a particularly high wave. We make a detailed analysis of the storm, the measured and model spectra allowing also a keen search of the suitability of the conditions for single large waves. The availability of the data in both moored and drifting conditions offers the possibility of a quantified discussion on the accuracy of the measurements in the two different situations.

Published
2019

2. Space-time extreme wind waves: Analysis and prediction of shape and height

Author

Sclavo Mauro, Bergamasco Filippo, Barbariol Francesco, Benetazzo Alvise, and Carniel Sandro

Subjects
Atmospheric Science, 010504 meteorology & atmospheric sciences, Meteorology, Space-time extreme statistics, Extreme sea waves, Quasi-determinism model, Rogue waves, Wave profile and height, Oceanography, Computer Science (miscellaneous), Geotechnical Engineering and Engineering Geology, Settore GEO/12 - Oceanografia e Fisica dell'Atmosfera, Sea state, 01 natural sciences, 010305 fluids & plasmas, 0103 physical sciences, Wind wave, Wave height, Rogue wave, Dispersion (water waves), 0105 earth and related environmental sciences, Settore INF/01 - Informatica, Elevation, Geodesy, Crest, Significant wave height, Geology
Abstract

In this study, we present the analysis of the temporal profile and height of space-time (ST) extreme wind waves. Wave data were gathered from an observational ST sample of sea surface elevations collected during an active sea state, and they were examined to detect the highest waves (exceeding the rogue wave threshold) of specific 3D wave groups close to the apex of their development. Two different investigations are conducted. Firstly, local maximum elevations of the groups are examined within the framework of statistical models for ST extreme waves, and compared with observations and predictions of maxima derived by one-point time series of sea surface elevations. Secondly, the temporal profile near the maximum wave crests is analyzed and compared with the expectations of the linear and second-order nonlinear extension of the Quasi-Determinism (QD) theory. Our goal is to verify, with real sea data, to what extent, one can estimate the shape and the crest-to-trough height of near-focusing large 3D wave groups using the QD and ST extreme model results. From this study, it emerges that the elevations close to the crest apex are narrowly distributed around a mean profile, whilst a larger dispersion is observed away from the maximum elevation. Yet the QD model furnishes, on average, a fair prediction of the maximum wave heights, especially when nonlinearities are taken into account. Moreover, we discuss how the combination of ST extreme and QD model predictions allows establishing, for a given sea condition, the portrait of waves with very large crest height. Our results show that these theories have the potential to be implemented in a numerical spectral model for wave extreme prediction. (C) 2017 Elsevier Ltd. All rights reserved.

Published
2017
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4. Space-time extremes of sea wave states: field, analytical and numerical investigations

Author

Barbariol, Francesco

Subjects
spectral numerical modeling, wave analysis, space-time extremes, ocean waves, SWAN, Mediterranean Sea, ICAR/02 Costruzioni idrauliche e marittime e idrologia, Settore ICAR/02 - Costruzioni Idrauliche e Marittime e Idrologia
Abstract

Evaluation of wave extremes occurring in short-crested sea states is the research topic of this doctoral thesis. Short-crestedness is the typical condition in sea storms. In fact, engineering practice and reports from people working offshore (e.g. on fixed platforms or routing ships) are raising questions on the adequacy of conventional wave statistics for the prediction of extremes during short-crested storm conditions. Indeed, wave statistics has been traditionally derived from time measurements, i.e. at a fixed point. Recently, experimental evidence has proved that the maximum sea surface elevation occurring at a fixed point of the sea is smaller than the maximum occurring over a surrounding area. Hence, unless the space dynamics of wave groups is fully included inside the area, the measured maximum at a point or over a smaller area underestimates the actual maximum. To overcome this fact, during the last decade stochastic models to calculate maxima of Gaussian multidimensional random fields, i.e. Piterbarg's theorem and Adler and Taylor's Euler Characteristic approach, have been applied to wave statistics. According to these theories, we should be able to estimate the expected maxima that can occur over an area (space) during a short-crested sea state of given duration (time), giving an explanation to the experimental evidence. The aim of this doctoral thesis is to investigate and discuss these recently applied stochastic models, in order to contribute changing the paradigm of wave analysis: from time to space-time domain. Thus, we worked on multiple fronts with multiple approaches. Field campaigns allowed us to validate stochastic models and to propose a data analysis procedure to characterize sea states at a given location with respect to space-time wave extremes. Analytical and numerical approaches served us to give possible solutions to the well-recognized lack of directional wave spectra, i.e. the input of the multidimensional stochastic models. Indeed, we propose closed formulae to calculate the input spectral parameters in a context of idealized sea states and we develop an ad hoc version of the SWAN (Simulating WAves Nearshore) model, called SWAN-ST (SWAN Space-Time), to allow space-time extreme analysis to be performed on realistic domains. Moreover, analytical and numerical model outputs were used to investigate the dependence of wave extremes upon specific physical parameters governing wind wave mechanics (i.e. wind speed, fetch length, ambient current speed and bottom slope). Finally, we tested the numerical modeling of space-time extremes on realistic domains by running a 3 years hindcast of on the Mediterranean Sea.

Published
2014

11. Copernicus Marine Service Ocean State Report, Issue 5

Author

von Schuckmann, Karina, Le Traon, Pierre-Yves, Smith, Neville, Pascual, Ananda, Djavidnia, Samuel, Gattuso, Jean-Pierre, Grégoire, Marilaure, Aaboe, Signe, Alari, Victor, Alexander, Brittany E., Alonso-Martirena, Andrés, Aydogdu, Ali, Azzopardi, Joel, Bajo, Marco, Barbariol, Francesco, Batistić, Mirna, Behrens, Arno, Ismail, Sana Ben, Benetazzo, Alvise, Bitetto, Isabella, Borghini, Mireno, Bray, Laura, Capet, Arthur, Carlucci, Roberto, Chatterjee, Sourav, Chiggiato, Jacopo, Ciliberti, Stefania, Cipriano, Giulia, Clementi, Emanuela, Cochrane, Paul, Cossarini, Gianpiero, D'Andrea, Lorenzo, Davison, Silvio, Down, Emily, Drago, Aldo, Druon, Jean-Noël, Engelhard, Georg, Federico, Ivan, Garić, Rade, Gauci, Adam, Gerin, Riccardo, Geyer, Gerhard, Giesen, Rianne, Good, Simon, Graham, Richard, Greiner, Eric, Gundersen, Kjell, Hélaouët, Pierre, Hendricks, Stefan, Heymans, Johanna J., Holt, Jason, Hure, Marijana, Juza, Mélanie, Kassis, Dimitris, Kellett, Paula, Knol-Kauffman, Maaike, Kountouris, Panagiotis, Kõuts, Marilii, Lagemaa, Priidik, Lavergne, Thomas, Legeais, Jean-François, Libralato, Simone, Lien, Vidar S., Lima, Leonardo, Lind, Sigrid, Liu, Ye, Macías, Diego, Maljutenko, Ilja, Mangin, Antoine, Männik, Aarne, Marinova, Veselka, Martellucci, Riccardo, Masnadi, Francesco, Mauri, Elena, Mayer, Michael, Menna, Milena, Meulders, Catherine, Møgster, Jane S., Monier, Maeva, Mork, Kjell Arne, Müller, Malte, Nilsen, Jan Even Øie, Notarstefano, Giulio, Oviedo, José L., Palerme, Cyril, Palialexis, Andreas, Panzeri, Diego, Pardo, Silvia, Peneva, Elisaveta, Pezzutto, Paolo, Pirro, Annunziata, Platt, Trevor, Poulain, Pierre-Marie, Prieto, Laura, Querin, Stefano, Rabenstein, Lasse, Raj, Roshin P., Raudsepp, Urmas, Reale, Marco, Renshaw, Richard, Ricchi, Antonio, Ricker, Robert, Rikka, Sander, Ruiz, Javier, Russo, Tommaso, Sanchez, Jorge, Santoleri, Rosalia, Sathyendranath, Shubha, Scarcella, Giuseppe, Schroeder, Katrin, Sparnocchia, Stefania, Spedicato, Maria Teresa, Stanev, Emil, Staneva, Joanna, Stocker, Alexandra, Stoffelen, Ad, Teruzzi, Anna, Townhill, Bryony, Uiboupin, Rivo, Valcheva, Nadejda, Vandenbulcke, Luc, Vindenes, Håvard, Vrgoč, Nedo, Wakelin, Sarah, and Zupa, Walter

Subjects
14. Life underwater
Abstract

Copernicus Marine Service Ocean State Report, Issue 5

12. Copernicus Marine Service Ocean State Report, Issue 5

Author

von Schuckmann, Karina, Le Traon, Pierre-Yves, Smith, Neville, Pascual, Ananda, Djavidnia, Samuel, Gattuso, Jean-Pierre, Grégoire, Marilaure, Aaboe, Signe, Alari, Victor, Alexander, Brittany E., Alonso-Martirena, Andrés, Aydogdu, Ali, Azzopardi, Joel, Bajo, Marco, Barbariol, Francesco, Batistić, Mirna, Behrens, Arno, Ismail, Sana Ben, Benetazzo, Alvise, Bitetto, Isabella, Borghini, Mireno, Bray, Laura, Capet, Arthur, Carlucci, Roberto, Chatterjee, Sourav, Chiggiato, Jacopo, Ciliberti, Stefania, Cipriano, Giulia, Clementi, Emanuela, Cochrane, Paul, Cossarini, Gianpiero, D'Andrea, Lorenzo, Davison, Silvio, Down, Emily, Drago, Aldo, Druon, Jean-Noël, Engelhard, Georg, Federico, Ivan, Garić, Rade, Gauci, Adam, Gerin, Riccardo, Geyer, Gerhard, Giesen, Rianne, Good, Simon, Graham, Richard, Greiner, Eric, Gundersen, Kjell, Hélaouët, Pierre, Hendricks, Stefan, Heymans, Johanna J., Holt, Jason, Hure, Marijana, Juza, Mélanie, Kassis, Dimitris, Kellett, Paula, Knol-Kauffman, Maaike, Kountouris, Panagiotis, Kõuts, Marilii, Lagemaa, Priidik, Lavergne, Thomas, Legeais, Jean-François, Libralato, Simone, Lien, Vidar S., Lima, Leonardo, Lind, Sigrid, Liu, Ye, Macías, Diego, Maljutenko, Ilja, Mangin, Antoine, Männik, Aarne, Marinova, Veselka, Martellucci, Riccardo, Masnadi, Francesco, Mauri, Elena, Mayer, Michael, Menna, Milena, Meulders, Catherine, Møgster, Jane S., Monier, Maeva, Mork, Kjell Arne, Müller, Malte, Nilsen, Jan Even Øie, Notarstefano, Giulio, Oviedo, José L., Palerme, Cyril, Palialexis, Andreas, Panzeri, Diego, Pardo, Silvia, Peneva, Elisaveta, Pezzutto, Paolo, Pirro, Annunziata, Platt, Trevor, Poulain, Pierre-Marie, Prieto, Laura, Querin, Stefano, Rabenstein, Lasse, Raj, Roshin P., Raudsepp, Urmas, Reale, Marco, Renshaw, Richard, Ricchi, Antonio, Ricker, Robert, Rikka, Sander, Ruiz, Javier, Russo, Tommaso, Sanchez, Jorge, Santoleri, Rosalia, Sathyendranath, Shubha, Scarcella, Giuseppe, Schroeder, Katrin, Sparnocchia, Stefania, Spedicato, Maria Teresa, Stanev, Emil, Staneva, Joanna, Stocker, Alexandra, Stoffelen, Ad, Teruzzi, Anna, Townhill, Bryony, Uiboupin, Rivo, Valcheva, Nadejda, Vandenbulcke, Luc, Vindenes, Håvard, Vrgoč, Nedo, Wakelin, Sarah, and Zupa, Walter

Subjects
14. Life underwater
Abstract

Copernicus Marine Service Ocean State Report, Issue 5

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