Modélisation morphodynamique d'une embouchure lagunaire.

This paper deals with the morphodynamic modelling of cross-section stability at tidal inlets. An idealized inlet is built with the DHI’s numerical tool MIKE 21 CAMS which is a control shell that combines MIKE 21 finite different models for waves, flow and sand transport with a bed level update scheme to model the morphological evolution in time. Once the model is calibrated according to the experiments of Seabergh et al. 14 , several tests are carried out to show the inlet evolution and particularly the slope erosion which is responsible for its widening. This enlargement is a key parameter for the cross-section stability of an inlet. Simulated cross-sections are thus compared to the results of the lab in pure current cases. In a second time the computations obtained with MIKE 21 CAMS are confronted with those from the DHI’s new model FM. This integrates the coupled equations for current and waves using the finite volume theory and allows new possibilities in the 2D numerical modelling.