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根据Ｐｒａｎｄｔｌ理论关于对数流速分布的假定，利用间接测量法测量了相同流量不同水深情况下明渠底部的切应力分布．结果显示，在明渠边壁糙率突然减少的两边流速分布和边壁切应力均有最大值．根据作者的试验结果，给出了槽底平均切应力τ０与明渠流弗汝德数Ｆｒ的相关关系，可供参考．
According to the assumption of logarithmic velocity distribution by Prandtl theory, the shear stress distribution at the bottom of open channel with different water depth under the same flow rate was measured by indirect method. The results show that the flow velocity distribution and the shear stress on the sidewalls both have a maximum at the sudden decrease of the roughness of the open channel. According to the author’s test results, the relationship between the average shear stress τ0 at the groove bottom and the Frude number Fr in the open channel flow is given for reference.