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	Provedor de dados ArchiMer (4) Autor Cayocca, Florence (4) Gaurier, Benoit (4) Germain, Gregory (4) Kervella, Youen (4) Lesueur, Patrick (4) Facq, Jean-valery (2) Davourie, Julia (1) Mais... Palavra-chave Boundary layer (2) Oyster table (2) Sediment dynamics (2) Computational fluid dynamics (1) Contraintes de cisaillement (1) Essais expérimentaux (1) Flume (1) Hydrodynamique côtière (1) LDV measurement (1) Laser Doppler Velocimetry (1) Mesures LDV (1) Particle Image Velocimetry (1) Porosity (1) Roughness length (1) Simulations numériques (1) Table ostréicole (1) Mais... Tipo do documento Text (4) Ano 2011 (1) 2010 (2) 2009 (1) País France (4) Idioma Inglês (3) Francês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última Boundary layer development and shear stresses measurements around an oyster table ArchiMer Kervella, Youen; Germain, Gregory; Gaurier, Benoit; Facq, Jean-valery; Cayocca, Florence; Lesueur, Patrick. Oyster tables are artificial obstacles which are laid over muddy or sandy-muddy floors in intertidal areas. This study aims to show the current modifications related to the presence of the oyster table thanks to LDV measurement in a flume tank. Boundary layer development in different geometric configuration is underlined and suggests some important areas of velocity decrease and sediment transport modification. Shear stresses are also calculated near the bottom and around the table. The total shear stress in the water column exhibits an important increase when the flow passes through the oyster table, hence a flow energy decrease through dissipation. This study helps to understand the reasons for the increased sedimentation observed in some natural sites. Tipo: Text Ano: 2009 URL: http://archimer.ifremer.fr/doc/00022/13359/10388.pdf Caractérisation numérique et expérimentale des perturbations engendrées par la présence de tables ostréicoles ArchiMer Kervella, Youen; Germain, Gregory; Gaurier, Benoit; Cayocca, Florence; Lesueur, Patrick. Sur de nombreux sites ostréicoles, d’importants mouvements sédimentaires modifient les conditions d’exploitation. Les mouvements naturels sont modifiés par la présence des tables à huîtres, les phénomènes en jeu étant de deux ordres : la perturbation des courants de marée et la modification des conditions de houle. Nous présentons dans ce document la méthodologie mise en place pour améliorer la compréhension des perturbations physiques du milieu engendrées par l’implantation de tables ostréicoles et caractériser les modifications de l’écoulement. Les résultats obtenus, tant expérimentaux que numériques, sont présentés et les développements pour une extension du modèle à l’échelle d’un parc ostréicole sont discutés. Des essais expérimentaux réalisés à... Tipo: Text Palavras-chave: Mesures LDV; Essais expérimentaux; Simulations numériques; Contraintes de cisaillement; Hydrodynamique côtière; Table ostréicole. Ano: 2010 URL: http://archimer.ifremer.fr/doc/00011/12263/9044.pdf Experimental and numerical characterization of an oyster farm impact on the flow ArchiMer Gaurier, Benoit; Germain, Gregory; Kervella, Youen; Davourie, Julia; Cayocca, Florence; Lesueur, Patrick. Shellfish farming, particularly oyster farms, suffers from strong siltation phenomena which are harmful to the production of shellfish. The lack of knowledge about the impact of an oyster farm on the wave propagation and on the flow remains a significant difficulty for the comprehension of sediment transport processes in coastal zones. These effects are one of the possible sources of sedimentation. The study presented here focuses on describing finely hydrodynamical phenomena (velocity fields, turbulence parameters) around oyster tables. The analysis is based on experimental trials carried out in a flume tank on reduced models of oyster tables. Experiments highlight the flow perturbations in the near field and constitute a database for validation of... Tipo: Text Palavras-chave: Sediment dynamics; Oyster table; LDV measurement; Computational fluid dynamics; Porosity; Boundary layer. Ano: 2011 URL: http://archimer.ifremer.fr/doc/00043/15421/12974.pdf Experimental study of the near-field impact of an oyster table on the flow ArchiMer Kervella, Youen; Germain, Gregory; Gaurier, Benoit; Facq, Jean-valery; Cayocca, Florence; Lesueur, Patrick. Oyster farming structures are artificial obstacles which disturb tidal flow and wave propagation. These effects can induce modifications of erosion and sedimentation patterns, turbidity changes, local silting up and can be threatening for the shellfish farming itself. The understanding of the impact of these structures in terms of hydrodynamics and sediment dynamics in the far-field, i.e. at the scale of a bay, is a very challenging task. In order to investigate the far-field impact, it is very important to understand in the first place all the changes which occur at a smaller scale, i.e. at the scale of a single table for a farm consisting of oyster tables made of metallic wire structures on which porous bags of oysters are laid. This work is carried out... Tipo: Text Palavras-chave: Sediment dynamics; Roughness length; Boundary layer; Particle Image Velocimetry; Laser Doppler Velocimetry; Flume; Oyster table. Ano: 2010 URL: http://archimer.ifremer.fr/doc/2010/publication-7389.pdf Registros recuperados: 4 Primeira ... 1 ... Última

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