河床比降
- 网络Bed slope;river bed gradient;slope of river bed;channel gradient
河床比降-
究其原因，主要有以下方面：淮河中下游河床比降小、北岸支流流域面积大和支流曲系不发达等地理因素；
The causes were as followings : the geographic cause of the comparatively low middle and down beds of the Huai River and its large north branch area , as well as its underdeveloped branch system ;
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河床组成与河谷比降直接影响流量过程的作用效果。
The discharge process influences the channel pattern based on the relationship between the flow and the river bed .
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这时河床十分宽阔，在-20-30m附近河床的宽度是现今河床宽度的4-5倍。这一时期河床特性是：河床宽，比降小，流量大，流速小，河流的沉积作用比较强。
Drop of water is smaller , riverbed is very broad , and runoff is very large , current velocity is small , aggradation is prominent .