采用深度平均方法提出了一种适体坐标下的k-ε二方程模型，应用正交交错网格及非正交交错网格的方法，实现了对具有大弯曲度河段和有侧向汇流河段水质污染的数值模拟。然后，应用此模型对三峡库区重庆段进行水质预测,预见三峡枢纽工程的建设给水环境所带来的影响，提出相应的应对措施；并为三峡库区水体的功能区划分提供依据。

Adopting depthaveraged method a kε model ina boundaryfitted coordinate system was deduced. Employing both orthogonal staggered mesh and nonorthogonal staggered mesh methods, the water pollution in some river reaches with a large curvature or with tributary entrances can be numerically simulated. Then, the water quality predication for Chongqing stretch of Three Gorges Reservoir may be performed using this model, and the influence ofthe TGPs construction on water environment can be forecasted in time. Some corresponding countermeasures are suggested. The basis for classifying functional waterbody regions of Three Gorges Reservoir is provided. 