Author(s)

F. Saint-Cast, J.P. Caltagirone, P. Bonneton

Abstract

On the splitting of the sediment fluxes balance: anew formulation for the sand waves equation F. Saint-Cast % J.P. Caltagirone*, P. Bonneton^ * Laboratory MASTER-ENSCPB, University of Bordeaux, France *Department of Geology and Oceanography, University of Bordeaux, France Abstract Computing of coastal morphological evolution requires high numerical resolution for the sediment conservation equation. The splitting method exploits the relationship between the sediment discharge formula and the hydrodynamics variables. After the sedimentary hydrodynamics model has been defined, the sediment fluxes balance is splitted in order to obtain a new formulation for the sand waves equation. Therefore, several terms of great physical and mathematical interest are obtained. The physical mechanism of the non-linear sand waves propagation is found to vary with respect to the water depth dependence of the sediment fluxes and it is weighted by the flow regime. The current streamline divergence effec

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