The amount underground of return flow depends mainly on local natural conditions, such as the topography, land situation, while the slope has great impact influence on it.
地下回归水量主要取决于当地的自然条件，如地形，土地情况，其中坡度对地下回归水的影响最大。
For a mountainous river, because of the great variation of river morphology along flow route, the local energy loss has a great impact on hydrodynamics.
山区型河道因河势变化急剧而产生的局部阻力对水流流态影响较大。
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