The numerical calculation on the behavior of oil pollutant in the bay is carried out by combined using of the two dimensions numerical model of current and wave and the two dimensions numerical model of oil pollutant s diffuse and transportatioa The numerical experiment showed that the calculation correctly describes the behavior of oil pollutant.

Based on the detailed analysis of the 2D sediment laden flow model,an integration model (including data integration model and function integration model) of geographical information system(GIS) and 2D sediment laden flow model is proposed.

In the paper,on the basis of the two-dimensional flow model and by applying the finite volume method and unstructured mesh,the waterlogging and drainage of the Datong Lake-polder with different precipitations and floods were studied.

The vertical 2D numerical wave models not only describes the instantaneous process of the wave interation with obstacles but also can give details of the current field, which is far more outstanding than the physical model and other traditional analyzing methods, it is thus of great importance to develop a numerical model of wave action on obstacles and to use it.