Numerical Simulation Of Sediment Transport In Coastal Area And Its Application

Estuarine and coastal are not only the assembled and dismissed area of the earth energy flow and material flow, but also the area with dense population and coastal engineering. Due to economic growth, the problems of pollutant discharge, reclamation project on sea coast, marine environment protection are become more and more important than before. Therefore it's necessary to study the environmental variation of estuarine and coastal, and the hydrodynamic and sediment transport is one of the main problems in this research.There are several research methods in this field, such as theoretical study, experiment, observation, and numerical simulation. In this paper, the characteristic in shore current and sediment transport and the method of numerical modeling are both discussed based on hydrodynamic and sediment transport theory and numerical method. The model is composed of Three modules: a hydrodynamics module based on the nonlinear shallow water equation, a suspended sediment transport module and a seabed deformation module. The hydrodynamics module is solved with the alternating directional inlicit(ADI)algorithm to obtain the water level and the current velocity. In the suspended sediment module, ADI is also used to solve the sediment transport equation.The numerical model is tested by simulating tidal flows and suspended sediment transport in sea area near Changxingdao which located in DaLian. The tidal currents, the suspended sediment concentration and the change of the seabed predicted by the numerical model are compared with field data measured in field sites. And the results show good agreement between the numerical predictions and the field measured data.Finally, the model is applied to man-made island in Nanpu to study the possible mud washing and filling conditions by tidal current.