曼宁方程,曼宁公式;
Besides, as it is very difficult in using Manning's equation to compute directly, traditional method made some approximation in application.
此外,由于直接采用曼宁公式计算比较困难,因此传统算法在实际计算时采取了一些近似方法。
Because the situation of an actual river is so complex ( not as artificially channels) that using Manning's equation will lead to error inevitably.
因为天然河道形状复杂,故而在近似化为宽浅人工渠道并用曼宁公式处理时不可避免地会带来模型误差。
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