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采用正交曲线拟合坐标和物理分步法，建立了一种天然河道二维流场的数学模型。通过计算实例说明，该数学模型对数值求解具有复杂边界河道的流速场很有效，可应用于工程实践。
Using orthogonal curve fitting coordinate and physical step method, a mathematical model of two-dimensional flow field in natural river was established. The calculation example shows that the mathematical model is very effective for solving the flow field with complicated boundary rivers and can be applied to engineering practice.