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| Registros recuperados: 11 | |
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| Li, Shuiqing; Zhao, Dongliang. |
| The ocean waves are generally mixed with wind wave and swell. In order to separate these two kinds of ocean waves, many wave spectral partitioning techniques have been proposed. In this study, a two-dimensional(2D) and three one-dimensional (1D) wave spectral partitioning techniques (denoted as PM, WH, and JP) are examined based on the model simulations and in-situ observations. It is shown that the 2D technique could provide the most reliable results as a whole. Compared with 2D technique, PM and JP techniques obviously overestimate the wind-wave components, and the same situation happens for WH technique at low wind speed. With the adjustment of the partitioning frequency ratio, the 1D PM technique is modified, in which the result agree well with that of... |
| Tipo: Journal Contribution |
Palavras-chave: Wind waves; Swell; Wave spectra. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/5846 |
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| Violante-Carvalho,Nelson; Paes-Leme,Rafael B.; Accetta,Domenico A.; Ostritz,Frederico. |
| The SWAN wave model is widely used in coastal waters and the main focus of this work is on its application in a harbor. Its last released version - SWAN 40.51 - includes an approximation to compute diffraction, however, so far there are few published works that discuss this matter. The performance of the model is therefore investigated in a harbor where reflection and diffraction play a relevant role. To assess its estimates, a phase-resolving Boussinesq wave model is employed as well, together with measurements carried out at a small-scale model of the area behind the breakwater. For irregular, short-crested waves with broad directional spreading, the importance of diffraction is relatively small. On the other hand, reflection of the incident waves is... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Wind waves; SWAN model; Wave reflection; Wave diffraction; Wave transformations in a harbor. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400019 |
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| Peureux, Charles; Ardhuin, Fabrice; Guimarães, Pedro Veras. |
| The wave action equation provides a general framework that has been applied to the conservative hydrodynamic interactions between short and long surface waves. So far, only a limited range of solutions have been investigated. Here we show that the wave action equation predicts that groups of short waves propagating over long monochromatic waves are unstable. We demonstrate theoretically and numerically a new ratchet‐type instability that progressively condenses short wave action around the long wave crests due to the correlation of phase speed and action fluctuations. This instability is of particular interest because it may lead to a higher probability of breaking for short waves propagating in directions within ±35 degrees of the dominant waves... |
| Tipo: Text |
Palavras-chave: Instability; Modulation; Wind waves. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00661/77318/83369.pdf |
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| Dodet, Guillaume; Melet, Angélique; Ardhuin, Fabrice; Bertin, Xavier; Idier, Déborah; Almar, Rafael. |
| Surface gravity waves generated by winds are ubiquitous on our oceans and play a primordial role in the dynamics of the ocean–land–atmosphere interfaces. In particular, wind-generated waves cause fluctuations of the sea level at the coast over timescales from a few seconds (individual wave runup) to a few hours (wave-induced setup). These wave-induced processes are of major importance for coastal management as they add up to tides and atmospheric surges during storm events and enhance coastal flooding and erosion. Changes in the atmospheric circulation associated with natural climate cycles or caused by increasing greenhouse gas emissions affect the wave conditions worldwide, which may drive significant changes in the wave-induced coastal hydrodynamics.... |
| Tipo: Text |
Palavras-chave: Wind waves; Sea level; Coastal zone; Climate change. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00509/62046/66721.pdf |
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| Hwang, Paul A.; Reul, Nicolas; Meissner, Thomas; Yueh, Simon H.. |
| Whitecaps manifest surface wave breaking that impacts many ocean processes, of which surface wind stress is the driving force. For close to a half century of quantitative whitecap reporting, only a small number of observations are obtained under conditions with wind speed exceeding 25 m/s. Whitecap contribution is a critical component of ocean surface microwave thermal emission. In the forward solution of microwave thermal emission, the input forcing parameter is wind speed, which is used to generate the modeled surface wind stress, surface wave spectrum, and whitecap coverage necessary for the subsequent electromagnetic (EM) computation. In this respect, microwave radiometer data can be used to evaluate various formulations of the drag coefficient,... |
| Tipo: Text |
Palavras-chave: Wave breaking; Wind stress; Wind waves; Severe storms; Microwave observations; Satellite observations. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00506/61757/65730.pdf |
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| Monbaliu, J.. |
| The atmosphere sees the ocean, with sometimes huge waves, as a much smoother surface, compared to its passage over land where it is slowed down much more, even if obstacles are small compared to the size of ocean waves. A good observer notices right away that waves travel with the wind and consequently do not give much resistance. The details of how much resistance there actually is and its variation with wind speed and parameters defining the wave conditions has been a hot topic for the last 35 years. The correctness of the roughness formulation is a crucial question in the understanding of the air-sea interface. It has major implications in wave modelling, in storm surge modelling and also in modelling of the atmospheric boundary layer above the ocean.... |
| Tipo: Info:eu-repo/semantics/doctoralThesis |
Palavras-chave: Wave dissipation; Whitecapping; Wind wave generation; Wind wave parameters; Wind waves. |
| Ano: 1992 |
URL: http://www.vliz.be/imisdocs/publications/226617.pdf |
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| Registros recuperados: 11 | |
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