为解决现状水体二维水质模型污染因子反应原理单一的问题，将WASP5 水质模型总氮循环的基本方程作为源项，采用有限体积法(FVM)配合通量向量分裂格式(FVS)的问题水体二维水量水质耦合的数学模型，并应用于某湖区水体二维水域的水量水质数值模拟，模拟成果验证了该耦合模型具有较高的可靠性与推广性。

In order to resolve the singleness of reaction principle of pollution factor in the 2-D water quality model, the basic equation of WASP5 water quality model (circle of total nitrogen) was taken as a source item, and a 2-D unsteady water quality and water quantity numerical coupling model was established by finite volume method (FVM) and flux vector splitting (FVS). The coupling model was applied to simulate the water quality and water quantity in a certain lake. The simulation result shows that the coupling model is reliable and practical.