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| Roland, Aron; Ardhuin, Fabrice. |
| The development of numerical wave models for coastal applications, including coupling with ocean circulation models, has spurred an ongoing effort on theoretical foundations, numerical techniques, and physical parameterizations. Some important aspects of this effort are reviewed here, and results are shown in the case of the French Atlantic and Channel coast using version 4.18 of the WAVEWATCH III R model. Compared to previous results, the model errors have been strongly reduced thanks to, among other things, the introduction of currents, coastal reflection, and bottom sediment types. This last item is described here for the first time, allowing unprecedented accuracy at some sites along the French Atlantic Coast. The adequate resolution, necessary to... |
| Tipo: Text |
Palavras-chave: Wave modeling; Bottom friction; Coupling; Wave-current interaction. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00192/30288/29918.pdf |
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| Rascle, Nicolas; Nouguier, Frederic; Chapron, Bertrand; Ocampo-torres, Francisco J.. |
| High-resolution satellite images of the ocean surface in and around the sunglint often provide unique observations of sub-mesoscale upper ocean surface processes. Local anomalies of wind, waves, currents or surfactants appear on the images as local anomalies of brightness. A quantitative interpretation of those brightness anomalies must relate them to slope properties of the wave field, which are to the lowest order described by the mean square slope (mss). The prevailing paradigm for such interpretation is that of the critical zenith angle. It states that, for sub-critical zenith view angle, brightness and mss anomalies have opposite signs, and this defines the so-called inversion region. This prevailing paradigm implicitly builds on the assumption that... |
| Tipo: Text |
Palavras-chave: Sea surface roughness; Surface current gradients; Submesoscale turbulence; Wave-current interaction; Surfactants; Sun glint imagery; SAR images; Multi-angle radiometers; Surface slope distribution; Mean square slope. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00448/55964/57498.pdf |
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| Lloyd, Catherine; Allmark, Matthew; Ordonez-sanchez, Stephanie; Martinez, Rodrigo; Johnstone, Cameron; Germain, Gregory; Gaurier, Benoit; Mason-jones, Allan; O'Doherty, Tim. |
| A comparison of a tidal turbine's performance and structural loads is conducted using lab-scale numerical models and experimental testing under multiple current-only and wave-current conditions at the IFREMER wave-current flume. Experimental testing, used to validate CFD models, was accomplished using a 0.9 m diameter, 3-bladed tidal turbine and had a blockage ratio of 8% while the turbine was submerged. Initial investigations analysed the performance and loads on the turbine under uniform and profiled current-only conditions. The presence of a profiled velocity gradient was found to have a negligible effect on the average performance characteristics; however, transient thrust, torque and out of plane bending moment loads experienced much greater... |
| Tipo: Text |
Palavras-chave: Tidal stream turbine; Wave-current interaction; Computational fluid dynamics; Regular waves; Experimental validation; Marine energy. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00678/78987/81381.pdf |
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