Numerical Solution of Water Quality for Yangtze River in the Vicinity of Nanjing City

This paper is concerned with the numerical solution of two-dimensional flows. The technique of boundary-fitted coordinate system is used to overcome the difficulties resulting from the complicated shape of natural river boundaries; the method of physical fractional steps is used to solve the partial differential equations in the transformed plane; and the technique of moving boundary is used to deal with the river bed exposed to water surface. The numerical method has been used to predict the water quality for Yangtze River in the vicinity of Nanjing city. Comparison between computed and experimental data shows a satisfactory agreement.