Utilisation de données altimétriques (Altus) dans la caractérisation de climats hydrodynamiques contrôlant le fonctionnement hydrosédimentaire d'une vasière intertidale : cas de l’estuaire de la Vilaine (Bretagne, France)
2010
Depuis la construction du barrage d’Arzal entre 1965 et 1970, l’estuaire de la Vilaine est soumis a un fort envasement. A partir de donnees bathymetriques, hydrologiques et altimetriques (Altus), il est possible d’identifier des climats hydrodynamiques a differentes echelles spatiales et temporelles et de mieux quantifier les phases d’erosion ou de depot associees. De plus, il a ete possible de montrer l’impact d’un modele en seillons/banquettes ou d’un modele plan sur la dynamique de la vasiere. Translated version: The use of altimetric data (Altus) in the characterization of hydrodynamic climates controlling hydrosedimentary processes of intertidal mudflat: the Vilaine estuary case (Brittany, France) Since the construction of the Arzal dam between 1965 and 1970, the Vilaine estuary is characterized by a strong silting up. Hydrodynamic climates could be identified as responsible for erosion or deposition at different spatio-temporal scales from bathymetrical, hydrological and altimetric (NKE-Altus) data. Each thickness of eroded or deposited sediment could be associated to a typical hydrodynamic climate. Furthermore, it was possible to show the effect of a ridge-runnel bedforms or a smooth surface on the dynamic of the intertidal mudflat. Keywords: Intertidal mudflat; Hydrodynamics; Ridge-runnel bedforms (cross shore).
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