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通过 8组坡度、5种水深及 5种糙率情况下坡面薄层径流流态变化特征的实验研究 ,得出薄层径流的临界雷诺数为 10 0 0 ,对应的径流属层流时 ,水深上限为 3m m ,通过水深、糙率及坡度对雷诺数作用特征分析可知 ,雷诺数与水深、坡度的变化成正比 ,与糙率的变化成反比 ;水深的作用明显大于后两者 ,影响因子共同作用下 ,雷诺数的变化规律可用公式 Re=2 .331H1 .41 n- 0 .973S0 .486 - 2 88.17来描述。
Based on the experimental study on the characteristics of flow pattern of slope runoff on slope with 8 groups of gradient, 5 kinds of water depths and 5 kinds of roughness, the critical Reynolds number of runoff is 10 0 0. When the corresponding runoff belongs to laminar flow, The upper limit of water depth is 3m m. According to the analysis of the Reynolds number characteristics of water depth, roughness and slope, the Reynolds number is proportional to the change of water depth and slope, and is inversely proportional to the change of roughness rate. The effect of water depth is obviously greater than the latter two, Under the combined action of factors, the variation law of Reynolds number can be described by the formula Re = 2 .331H1 .41 n- 0 .973S0 .486 - 2 88.17.