采用3种不同粒径粗糙度的人工加糙明渠和光滑PVC壁面明渠，在9种不同底坡、6组不同的流量条件下，研究了明渠均匀流中糙率值与粗糙度、弗汝德数间相关关系。研究结果表明：①相同流量条件下：随着弗汝德数Fr的增大，糙率n值逐渐增大。同一弗汝德数Fr下，粗糙度Δ越大，糙率n值越大。②不同绝对粗糙度下：随着弗汝德数Fr增大，糙率n值增大。当Fr<0.70时(即缓流)，糙率n值与弗汝德数Fr有关，与绝对粗糙度Δ关系不大，即n=f(Fr);当0.71.0时(即急流)，糙率n值与绝对粗糙度Δ有关，与Fr关系不大，即n=f(Δ)。

Using 3 kinds of different roughness of artificial roughness channel, in 9 different bottom slope, 6 groups of different flow conditions, Studied the relationship between the roughness values and roughness, Froude number of open channel flow. The results show: ①Under the same flow conditions: With the increase of Froude number Fr, the roughness n value increases. Under the same Froude number Fr, The greater the roughness Δ, the greater the roughness value of n . ②Under different absolute roughness :When Fr<0.70, N roughness values with Froude number Fr related, and absolute roughness Δ has little to do, n=f(Fr);When 0.71.1 N roughness values with absolute roughness Δ related, and Froude number Fr has little to do, n=f(Δ).

新疆维吾尔自治区自然科学基金资助项目（2015211A025）