Numerical Simulation Of The Instability Mechanism On Coast Bias Bar

This thesis describes a hydrodynamic model extended with sediment transport capability in order to study bedform change on time scales up to several days. In this paper, using the momentum equations, nonlinear shallow water and sediment transport equations equation, hydrodynamic model, coast coastal terrain sedimentary transport model to simulate the impact, the main purpose is to study the case of the various hydrodynamic, terrain occurrence changing conditions and trends change. This paper focuses on the situation periodically and beach topography and the angle formed part of the principle of the simulation, and the simulation results and laboratory data were compared.In this paper, offshore coastal terrain instability were part of a brief discussion and analysis, and unstable terrain growth of a preliminary study on the relationship between wave numbers of unstable growth rate slightly are discussed. Analyze and exploration are doing to find how the topography at different wave patterns change, and the relationship between modes topographic evolution under different disturbance and model.In reality simulation, coastal slope, initial disturbance terrain wave wave height, angle of incidence, and the coast of beach cycle bottom friction coefficient, lateral mixing ratio will change in a significant impact on the terrain, but the greatest impact is the initial terrain disturbances and wave number.In this paper, the bed-surf and bed-flow conditions are tested based on the relatively gentle slope, wavelet high, relatively small incident angles and steep slopes, a large wave height, simulation of large incident angles, the main proof of the effects of radiation stress terms of the terrain changes, as well as the development of the case law and the impact occurred, and Other parameters affecting the topography of a brief analysis.