3D Numerical Simulation Of Cohesive Sediment Transport Under Winds And Waves

With the development of computer technology, three dimensional hydrodynamicand sediment transport model is becoming more and more widely used. However, theresearch on the 3D numerical model of sediment transport affected by complexfactors (such as waves, current, winds and etc.) is not so enough. So it is of greatsignificance to solve the engineering problem in esturine and coastal area to establishthe 3D numerical model of sediment transport during storm process.The SWAN wind wave model, the 2D ADCIRC current model and the 3DMOHID model are introduced to calculate the wind wave field and current field firstly.The 3D current computation is nested in the 2D model, so the computational time islargely reduced. In 3D model, the horizontal momentum equations are discretizedby the finite volume and the finite difference method, and the σ coordinate isapplied for vertical direction, so shallow water regions are well described.Based on the coupled modeling of wave field and current field, the MOHIDmodel is used to simulate sediment transport with interaction of wave and tide currentduring the process of strong winds and waves. Thus, a 3D numerical model, whichcan describe the sediment transport in complicated hydrodynamic conditions, is fullyestablished. The processes of erosion and deposition on the sea bed are fullyincorporated in the model, so the cohesive sediment transport patterns are revealedwell. The model is successfully applied for the modeling of channel siltation ofTianjin Harbor. The computional results can provide helpful data for haborconstruction and dredging in the future.