Wave-Current-Sediment Model Coupling and Its Application on Dynamic Process of Water and Sediment During Typhoon

A typhoon is one of the major factors that often cause sediment transport and bed erosion in estuarine coastal area. Under the extreme weather condition, the sediment-water mixture with high concentration that is caused by the wave and current would give rise to the sudden silting of the channel, the generating of high-turbidity maximum zone, and so on. In this study, a wave-current-sediment coupling system based on the finite volume method, triangular grid hydrodynamic model FVCOM, wave model FVCOM-SWAVE, sediment model FVCOM-SED was set to investigate the effect of typhoon on the sediment transport and bed erosion in the Yangtze Estuary. The results revealed the distributions of sediment concentration and sediment flux. By comparing bottom shear stress induced by current and wave, numerical modeling results indicated that the mechanism of the near-bottom residual transport of sediment and the generating of high-turbidity maximum zone.