3D wave-resolving simulation of sandbar migration

The problem of sandbar migration on the storm timescale is revisited with a 3D wave-resolving hydro-sedimentary model. latter presents an intermediate approach between expensive two-phase flow models and highly parametrized wave-averaged models. Innovative features include use weakly compressible assumptions in hydrodynamics morphological acceleration bed changes to speed up numerical simulations. model accurately simulates successive offshore onshore bar observed large-scale flume experiment response wave forcing representing post-storm (recovery) conditions. diagnosis sand transport analysis ensemble-averaged asymmetric cycle reveal mechanisms each phase. In all cases, sediment resuspension impacted by breaker-induced turbulence, while evolution are primarily result undertow distribution – seaward undercurrent across sandbar. There also significant contribution from wave-related fluxes, due greater mobilization currents during crest period.