通过对天然河流流带的拉伸或压缩处理，使之成为处处流速和水深均相等的理想河流，在此基础上建立了等效二维扩散模型。文中对建模方法和参数计算方法作了详细的介绍。%It has been suggested that the model of two-dimensional equivalent diffusion in natural river is based on stretching or compressing the fluid band of natural river so that it changes into perfect river in which the flow velocity and the depth of water are equal every point. The methods of modeling and calculation have also been introduced in detail.
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