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针对长宽尺寸较为悬殊的河道及泛区，利用三角形和等参四边形相杂交的有限元方法，结合矩阵质量集中技术，建立了相应的水流数学模型，并在独流减河水流模拟中进行了成功的应用．该方法克服了由于河道长宽尺寸悬殊引起的模拟困难，避免了以往河道与边区一、二维衔接模拟所产生的误差，具有可适应复杂边界、可随意进行局部加密和计算省时的优点，所建模型具有较大的实用价值．
According to the finite element method of hybrid of triangle and isoparametric quadrilateral, and the mass concentration of matrix, a mathematical model of water flow is established for the waterways and pan-river areas where the width and width of the waterways are far from each other. Successful application. The method overcomes the difficulty of simulation caused by the disparity of the length and width of the river, avoids the error caused by the one-dimensional and two-dimensional convergence of the river and the boundary in the past, has the advantages of being able to adapt to the complicated boundary, The model has great practical value.