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| Bennis, Anne-claire; Dumas, Franck; Ardhuin, Fabrice; Blanke, Bruno. |
| The mechanics of rip currents are complex, involving interactions between waves, currents, water levels and the bathymetry, that present particular challenges for numerical models. Here, the effects of a grid-spacing dependent horizontal mixing on the wave-current interactions are studied. Near the shore, wave rays diverge from channels towards bar crests because of refraction by topography and currents, in a way that depends on the rip current intensity which is itself modulated by the horizontal mixing. At low resolution with the grid-spacing dependent horizontal mixing, the wave motion is the same for both coupling modes because the wave deviation by the currents is weak. In high resolution case, however, classical results are found with the stabilizing... |
| Tipo: Text |
Palavras-chave: Numerical modeling; Rip currents; Turbulence modeling; Wave-current interactions. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00601/71288/69695.pdf |
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| Quilfen, Yves; Chapron, Bertrand. |
| Ocean currents can strongly impact the propagation of swell systems. Satellite altimetry routinely provides measurements of ocean surface significant wave heights (Hs). A self‐consistent space‐scale decomposition is applied to Hs measurements obtained from different altimeters. This method helps reveal overlooked statistical properties at scales less than 100 km, where meso‐ and sub‐mesoscale upper ocean circulation drives a significant part of the variability in the coupled ocean‐atmosphere system. In particular, systematic signatures related to wave‐current interactions are clear at global and regional scales. In the Agulhas current system, the proposed space‐scale decomposition further reveals organized and persistent patterns. To leading order, the... |
| Tipo: Text |
Palavras-chave: Altimeter observations; Wave-current interactions; Denoising method. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00472/58359/60917.pdf |
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| Delpey, Matthias; Ardhuin, Fabrice; Otheguy, P.; Jouon, Aymeric. |
| A three-dimensional wave-current model is used to investigate wave-induced circulations in a small estuarine bay and its impact on freshwater exchanges with the inner shelf, related to stratified river plume dispersion. Modeled salinity fields exhibit a lower salinity surface layer due to river outflows, with typical depth of 1 m inside the bay. The asymmetric wave forcing on the bay circulation, related to the local bathymetry, significantly impacts the river plumes. It is found that the transport initiated in the surf zone by the longshore current can oppose and thus reduce the primary outflow of freshwater through the bay inlets. Using the model to examine a high river runoff event occurring during a high-energy wave episode, waves are found to induce a... |
| Tipo: Text |
Palavras-chave: Nearshore dispersion; Wave-current interactions; River plume; Numerical modeling. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00170/28161/26390.pdf |
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| Quilfen, Yves; Yurovskaya, M.; Chapron, Bertrand; Ardhuin, Fabrice. |
| Strong ocean currents can modify the height and shape of ocean waves, possibly causing extreme sea states in particular conditions. The risk of extreme waves is a known hazard in the shipping routes crossing some of the main current systems. Modeling surface current interactions in standard wave numerical models is an active area of research that benefits from the increased availability and accuracy of satellite observations. We report a typical case of a swell system propagating in the Agulhas current, using wind and sea state measurements from several satellites, jointly with state of the art analytical and numerical modeling of wave-current interactions. In particular, Synthetic Aperture Radar and altimeter measurements are used to show the evolution of... |
| Tipo: Text |
Palavras-chave: Extreme waves; Wave-current interactions; Satellite altimeter; SAR. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00451/56289/57867.pdf |
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