A SIMPLIFIED MATHEMATICAL MODEL FOR THE LONG-TERM SEDIMENT TRANSPORT UNDER THE ACTION OF TIDAL CURRENTS AND WAVES

摘要

The present paper is concerned with numerical modeling on the sediment transport under the action of tidal currents and waves. Besides, a method of speed-up factor, which simplifies the mathematical model in the long-term numerical simulation and could avoid establishing the model problem lacking the measured datum in the rang of time and space, is also adopted in this paper. The two-dimensional depth-integrated numerical model is composed of three modules: a hydrodynamics model based on a two dimension nonlinear shallow water with wave radiation;wave model based on the wave spectral momentum balance equation and sediment model based on the formula of sediment transport and seabed deformation. Those equations are discreted by the finite difference method. The presented model may be useful to the port and coastal engineering. Ultimatelly, the sediment transport model combined the tidal current with wave in the sea area of the shengli oilfields of the Yellow River Delta is verified as an example and a long term shoreline forecasting stimulation is stimulated by the method of speed-up factor in the same domain.