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| Duarte, Rui; Carton, Xavier; Capet, Xavier; Cherubin, Laurent. |
| This paper addresses the instability of a two-layer coastal current in a quasi-geostrophic model; the potential vorticity (PV) structure of this current consists in two uniform cores, located at different depths, with finite width and horizontally shifted. This shift allows both barotropic and baroclinic instability for this current. The PV cores can be like-signed or opposite-signed, leading to their vertical alignment or to their hetonic coupling. These two aspects are novel compared to previous studies. For narrow vorticity cores, short waves dominate, associated with barotropic instability; for wider cores, longer waves are more unstable and are associated with baroclinic processes. Numerical experiments were performed on the f-plane with a... |
| Tipo: Text |
Palavras-chave: Stability and instability of geophysical and astrophysical flows; Vortex flows; Rotating fluids; Stability problems; Applications to physics. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00069/17999/15673.pdf |
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| Filipot, Jean-francois; Guimaraes, P.; Leckler, Fabien; Hortsmann, J.; Carrasco, R.; Leroy, Elodie; Fady, N.; Accensi, Mickael; Prevosto, Marc; Duarte, Rui; Roeber, V.; Benetazzo, A.; Raoult, C.; Franzetti, M.; Varing, Audrey; Le Dantec, N.. |
| This paper presents results from an experiment designed to improve the understanding of the relationship between extreme breaking waves and their mechanical loading on heritage offshore lighthouses. The experiment, conducted at La Jument, an iconic French offshore lighthouse, featured several records of wave, current and structure accelerations acquired during severe storm conditions, with individual waves as high as 24 m. Data analysis focuses on a storm event marked by a strong peak in the horizontal accelerations measured inside La Jument. Thanks to stereo-video wave measurements synchronized to the acceleration record we were able to identify and describe the breaking wave responsible for this intense loading. Our observations suggest that this giant... |
| Tipo: Text |
Palavras-chave: Extreme wave; Wave breaking; Wave loading. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00513/62480/66803.pdf |
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| Guillou, Sylvain; Filipot, Jean-francois; Thiebot, Jérôme; Germain, Gregory; Chaplain, Nicolas; Ikhennicheu, Maria; Duarte, Rui; Gaurier, Benoit; Bourgoin, Adrien; Mercier, Philippe; Ata, Riadh; Laverne, Jérôme; Benhamadouche, Sofiane; Pieterse, Aline; Maisondieu, Christophe; Poizot, Emmanuel; Poirier, Jean-charles; Auvray, Cedric; Droniou, Elois; Arramounet, Valentin; Pinon, Grégory. |
| Tidal turbine will be installed in area with high current and high turbulence level. A characterisation of this last is required. The aim of the project THYMOTE is to characterize and understand the generation of eddies from smaller to several tens of meters. Three technics are used: Numerical modelling, Physical modelling, field measurements. Physical and numerical modelling show clearly the appearance of the eddies close to the bottom in presence of dunes or rocks and their motion towards the free surface. |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00479/59091/61729.pdf |
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