本文利用高速水力学国家重点实验室的激光测速系统，对两种反弧半径，三种不同粗糙度的溢流反弧段的水流流速进行了量测。
The velocities over the spillway buckets of three roughness surfaces and two radius are measured by LDV in the National Key Laboratory of the Hydraulics for the High-velocity of CUST.
本文通过两相流理论分析和水力学试验验证证实：室内排水立管管壁粗糙度的减小，不仅不能加大其临界流量，反而会减小其临界流量。
It has been verified in this paper, by theoretical analysis with two-phase fluid mechanics and hydraulic tests, that decreasing surface roughness in a wade stack can not increase critical discharge.
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