A NUMERICAL MODEL OF THREE-DIMENSIONAL BEACH DEFORMATION DUE TO GRADED SEDIMENT TRANSPORT UNDER ATILT WAVES

Abstract

Laboratory experiments were performed on beach evolution and sediment sorting around coastal structures on a initially plane 1/20 sloping beach of uniformly graded sand. One experiment was for a detached breakwater, and the other for groins. Spatial and temporal variations of beach topographies and grain size distribution of surface sediments were described. A numerical model was developed on the basis of the enhanced Boussinesq equation and a sand transport model for mixed-grain size sands under atilt waves. The validity of the model was verified with experimental data.