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Evolution morphodynamique cross-shore d’un estran vaseux ArchiMer
Monbet, Valerie; Maisondieu, Christophe; Le Hir, Pierre.
The main goal of this study consists in evaluating the combined effect of cross-shore waves and current on the long term evolution of a mud flat profile. An original method is used to create a database of realistic wind fields and sea states. These data are applied to a numerical model of sediment transport and morphological changes. A description of long term simulations is proposed.
Tipo: Text Palavras-chave: Morphodynamique; Estran vaseux; Courant de marée; États de mer; Mer du vent.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/00203/31429/29824.pdf
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Nutrient fluxes on an intertidal mudflat in Marennes-Oleron Bay, and influence of the emersion period ArchiMer
Feuillet-girard, Michelle; Gouleau, Dominique; Blanchard, Gérard; Joassard, Lucette.
Fluxes of nutrients (NH sub(4) super(+), NO sub(3) super(-), PO sub(4) super(3-) and Si(OH) sub(4)) were studied on an intertidal mudflat in Marennes-Oleron Bay, France, at two different seasons and at different times of the emersion period. Fluxes through the sediment-water interface were both calculated from vertical profiles of nutrient concentration in pore-water (diffusive fluxes, JD) and measured in light and dark benthic mini-chambers (measured fluxes, J sub(0)). Results indicate that ammonia was mainly released in summer while nitrate was mainly taken up in late winter. This uptake from the overlying water was probably due to the coupling of nitrification-denitrification within the sediment. The J sub(0) /J sub(D) ratio further indicates that...
Tipo: Text Palavras-chave: Estran vaseux; Flux de nutriments; Microphytobenthos; Bioturbation; Marennes-Oléron; Intertidal mudflat; Nutrient fluxes; Microphytobenthos; Bioturbation; Marennes-Oleron Bay.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00038/14893/12220.pdf
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