Sediment And Temperature-Salinity Mathematical Model Applied In Beibu Gulf

The coastal estuarial area is continental-oceanic interaction region which take on complex hydrodynamic environment and active sediment movement. And the human beings' rebuilding activity(such as estuary regulation and offing production)and the development of city leads to a series of problems such as serious water pollution, environmental deterioration and sediment silting,which all need the urgent solution. So it's significance to study hydrodynamism rule in this area including sediment transport,dispersal of pollution, salt water encroachment and so on.In this paper, the theory of current sediment three-dimensional mathematical model and temperature-salinity two-dimension mathematical model is introduced.And the current equation is based on navier-stokes equation.The model equation has been deduced throughσ-coordinate transformation, then in this coordinate the three-dimensional flow field is split into many layers along its depth and the model equation in each layer is integrated.As to the numerical solving method,the methods of frictional steps ,difference approximation and galerkin lumping coefficient matrix definite element method are utilized.In a practical application, three-dimensional calculation is applied to the tide current of Campha thermal power station in Vietnam.We demonstrate the actual tidal level, flow direction, velocity and sediment concentration in three measurement stations. It shows that the calculated value coincide with measured value well. Generally, it was reliable to establish the two-dimension flow mode and reflect practice clearly.