Apports de la modélisation sur bathymétries historiques dans la compréhension des évolutions des bancs de sable estuariens

Formation and evolution of estuarine sand ridges are some of the less well known among the different classes of sand banks. Simulation of tides and related sand bedload transport on historical bathymetries brings new insights about the secular evolution of two estuarine sand ridges (the Saint-Georges and the 'Longe de Boyard' sand banks, Atlantic coast of France). Two different mechanisms are involved in order to explain the evolutions of these banks, suggesting the category of estuarine sand banks to be less homogenous than it is proposed in the last classifications of sand banks. To cite this article: X. Bertin, É. Chaumillon, C. R. Geoscience 337 (2005).