Calculations of exposure degree, exposure coefficient and equivalent grain size for grains with various size located at different position relative to the riverbed are carried out.
并对不同粒径，在床面不同位置的暴露度、暴露度系数及等效粒径进行了计算。
Furthermore, the concept of equivalent grain size and the method for calculation is suggested.
同时提出了等效粒径的概念及其计算方法。
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