Manning equation

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。

The predictor-corrector methods to determine Manning coefficient in the 2-D tidal wave movement equation is put up through the regression theory of numerical model and prototype.

通过数学模型和原型的相关理论推导了二维潮波运动方程中曼宁系数的预估校正法。

Based on the assumption that the flow surface is an exponential curve, the Manning formula is applied to deduce the equation expressing the advance process of the irrigation water flow in ditches.

根据水流水面线为幂函数曲线假定用满宁水流公式，推求了水流在畦田推进过程的表达式。