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本文建立了河口三维非线性斜压水流盐度数学模型。该模型通过。坐标变换，使整个水域垂直方向可采用相同的分层。基于过程分裂法，将三维流动分成表面重力波（外模式）和内重力波（肉模式）。外模式采用改进型双步全隐有限差分DSI法进行计算，内模式利用欧拉-拉格朗日公式，改进三维垂直方向隐式格式，减小了数值耗数，提高了计算精度及稳定性。该模型应用于长江口三维盐水入侵计算，结果表明水流盐度分布与实测一致。
In this paper, a mathematical model of three-dimensional nonlinear baroclinic flow salinity was established. The model passed. Coordinate transformation, so that the vertical direction of the entire waters can be the same stratification. Based on the process splitting method, the three-dimensional flow is divided into surface gravity waves (external mode) and internal gravity waves (meat mode). The external mode is calculated by the improved two-step all-implicit finite difference DSI method. The internal mode uses the Euler-Lagrange formula to improve the three-dimensional vertical implicit format, reduces the numerical consumption and improves the calculation accuracy and stability . The model is applied to the calculation of three-dimensional salt water intrusion in the Yangtze Estuary. The results show that the salinity distribution of the water current is consistent with the measured data.