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本文建立了闽江口二维水动力、污染扩散数值模型，模型采用ADI双向隐式求解。在水动力模拟中，对岸界的丁坝采用线性边界进行拟合，并考虑到河口区侧向摩擦作用；在污染扩散摸拟中，用动态拟合的方法对浓度水边界进行了较为合理的改进。计算结果表明，本模型是成功的。
In this paper, a two-dimensional numerical model of hydrodynamic and pollution diffusion in the Minjiang River estuary was established. The model was implicitly biased by ADI. In the hydrodynamic simulation, the dam on the opposite bank was fitted with a linear boundary and considered the lateral friction in the estuary area. In the simulation of pollution diffusion, the dynamic fitting method was used to make a more reasonable improvement on the concentration water boundary . The calculation results show that this model is successful.