A 3D fully coupled wave-current-sediment model
Adong Feddy1,2, Anne-Claire Bennis2, Dominique Mouazé3,4 and Bruno Chareyre5, (1)CNRS, M2C, Caen, France, (2)University of Lower Normandy, M2C laboratory, Caen, France, (3)Morphodynamique Continentale et Côtière (M2C), Normandie Univ, UNICAEN, UNIROUEN, CNRS, UMR 6143, Caen, France, (4)Morphodynamique Continentale et Côtière, Université de Caen, Caen, France, (5)University of Grenoble-Alpes, 3SR, Grenoble, France
Abstract:
In the framework of new energy sources, marine energy can contribute to diversification of energy mix. The study site is the Alderney Race where tidal velocities can exceed 4 meters per second. With this high current speeds, this site represents one of the best opportunities for exploitation of the tidal stream. Our aim is to investigate the influence of this high current speeds on the sediment transport. Modeling the sediment transport in the coastal environment requires an accurate prediction of current velocity and bottom shear stress. For that, the numerical wave-current model MARS-WW3 will be used to analyze the wave-current interaction and comparisons with experimental ADCP data will be presented. To simulate the non-cohesive sediment transport (such as sand, gravel or pebbles), this numerical model will be coupled with a discrete element model like YADE. In first time, the discrete model used will be validated with different tests cases. After, we will present the coupling MARS-WW3-YADE, in particular the expression and exchange of different forces exerted by the fluid flow on the sediments and by sediments on the fluid. Finally, simulations of the sediment transport will be shown and we will interest in particular to the influence of size and density of sediments. We also investigate the effects of tide and wave currents on the sediment displacement.
