Numerical simulation of sransportation and siffusion of pollutants in nearshore of Guanhe Estuary

Based on the two-dimensional hydrodynamic and water quality model,using CODMn as pollution index to simulate the changes of COD concentration and the law of transportation and diffusion of pollutants in the Guanhe Estuary,after the simulation,the result will be varified by the measure data.The results show that the simulation of hydrodynamics can meet the hydrodynamic of transportation and diffusion of pollutants,the calculation of water quality model can also reflect COD concentration changes in the Guanhe Estuary.In a tidal period,the transportation of pollutants directly related by the tidal current,during the ebb phase,the COD concentration range is wider and the concentration gradient is narrower than the flood phase.The high value area is located in Yanwei Port during the ebb phase,but during the flood phase,the area is transport to inner river,and in intidal ebb the area is more larger than in tidal flood.