Modelisation non-lineaire de propagation de houle sur un fond variable tridimensionnel

A fully non-linear High-Order Spectral (HOS) model, already developed for a flat bottom in the LHEEA Lab of Ecole Centrale de Nantes, has been expanded to a variable bottom. This paper deals with the validation of the HOS model for wave propagation over a 3D variable bottom. A comparison to the finite difference scheme OceanWave3D developed at the Technical University of Denmark (DTU) is presented. This model is an accurate and efficient method thanks to the surface formulation coupled with the spectral resolution. Validations in 2D have already been presented and here we focus on the three-dimensional problem by presenting wave focusing of regular and irregular waves over an elliptical mound. Several comparisons with OW3D are included.