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Rôle des herbiers de Zostères (Zostera noltii) sur la dynamique sédimentaire du Bassin d'Arcachon ArchiMer
Ganthy, Florian.
The intertidal flats in the Arcachon lagoon are extensively colonized by seagrass meadows of Zostera noltii. The last ten years these meadows experienced a drastic regression of their surface area. Understanding the impact of seagrass on hydrodynamics and sediment dynamics is required to anticipate the consequences of meadows regression on the sediment dynamics of the Arcachon lagoon. Flume experiments with natural seagrass highlighted a strong velocity attenuation associated with a turbulence increase near the bed within seagrass canopies. An increase in sediment protection from erosion and in deposition fluxes related to the seagrass growth was found. Erosion tests showed seasonal variability of sediment resistance against erosion associated with changes...
Tipo: Text Palavras-chave: Phanérogames; Zostera noltii; Croissance saisonnière; Dynamique sédimentaire; Bassin d’Arcachon; Seagrasses; Zostera noltii; Seasonal growth; Sediment dynamics; Arcachon lagoon.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00060/17170/14672.pdf
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