Effects of Sand Exploitation in Water Area South the Dohu Channel on HydrodynamicEnvironment and Prediction of Sediment Diffusion Density

A mathematic Model of flow and sediment was employed to predict and analize the change of hydrodynamic condition,the sediment diffusion during the process of exploitation and the change of scour and silting situation in the channel bed after sand exploitation in the southeast part of Dahu Channel.The paper put forword some suggestions about the management of sea sand exploitation.