3D Numerical Simulation Of Hydrodynamical And Water Quality For Taicang Reach Of The South Branch In Changjiang Estuary

Based on Coherens model, a 3 dimensional hydrodynamical and water quality mathematical model is established in finite difference algorithm.The hydrodynamical model is used to simulate the flow field of Taicang reach of the south branch in Changjiang esturay. The good agreement in the comparison of calculated results with observed values is obtained.In order to validate the water quality model, the concentration distribution discharged continuously by non-conservative matter in a rectangular flume is simulated. The results indicate that the water quality model has high precision both in the horizontal and vertical direction.The three dimensional water quality model is applied to analyze the water quality of Taicang reach of the south branch in Changjiang estuary. Based on the results of the hydrodynamical simulation, the chemical oxygen demand concentration is calculated, and the transportation and circulation of pollutant are analyzed.