应用“河网正交贴体坐标”技术拟合闽江河口多汊道河网 ,将网格控制在河道有效区域内 ,使网格空间步长大大缩小 ,提高了计算的可信度 .应用“矩阵追赶法”和“非线性二维潮流模型”等求解方法 ,很好地模拟了闽江河口复杂的潮流场 ,计算时间步长可长达 1 0min .该数学模型已在闽江口等多个工程中得到应用 ,效果良好 . Applying the technique of “river network orthogonal body coordinate” to fit the multi-channel river network in the Min River estuary, the grid is controlled in the effective area of ​​the river channel, the space step of the grid is greatly reduced, and the reliability of the calculation is improved. Such as the matrix catch-up method and the nonlinear two-dimensional tidal current model, which can well simulate the complicated tidal flow field in the Minjiang estuary and the calculation time step can be as long as 10 minutes. Many projects have been applied, the effect is good.