That is, the roughness coefficient decreased with the increase of Reynolds on steep slope.
在坡度较大时，阻力系数随雷诺数的增大而增大。
The wetted perimeter of this section is 83.7% of the rectangle in the same discharge, reach slope, roughness coefficient.
在同样水力条件下，最优园底直角断面的湿周是矩形最优断面的83.7%。
The experiment results show that the threshold velocity is affected by the ratio of roughness coefficient of ice cover and bed.
试验表明：冰盖下泥沙起动流速与冰盖及槽底糙率的相对比值有关。
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