低水头泄洪闸溢流堰挑坎出口挑角和坎高对其下游出流面流流态影响较大。在两个泄洪闸工程面流消能试验成果分析的基础上，对其溢流堰挑坎挑角和坎高对面流流态的影响进行了分析。研究表明，若挑坎坎高a较小时，可适当增大挑坎挑角θ值，以增大挑坎面流运行的泄洪流量和下游水深的范围；低水头泄洪闸面流消能的溢流堰挑坎挑角一般可采用10°~15°，当挑坎挑角增大至15°时，可较明显增大挑坎形成面流而不产生回复底流的下游水深的范围，扩大了面流运行的水深区间，有利于工程的安全运行。%The outlet bucket angle and hight of low-head release sluice overflow weir have a great effect on the downstream surface current pattern. Based on the surface current energy dissipation test results of two release sluice, the influence of bucket angle and hight of overflow weir on the surface current pattern is analyzed. The studies have shown that if the bucket high is smaller, the buck-et angle can be increased, which increase the range of release flood discharge and downstream water depth of bucket surface current operation. The bucket angle of the low overflow weir generally use 10°~ 15°, when the bucket angle is increased to 15°, the zone of the downstream water depth which forming surface current without return underflow is significantly increasing, and the water depth range of surface current operation is expanding and is good to the engineering running.
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