高拱坝泄洪表孔增设分流齿坎可以改善下泄水流流态和水垫塘底板的压力特性，提高消能效率，但由此带来分流齿坎的空化问题。采用减压模型试验方法对构皮滩水电站泄洪表孔分流齿坎的空化特性进行了试验研究。试验成果表明：该处空蚀可能性较大，而修改方案中，此处空化强度明显减弱且未超过空化初生阶段。

The surface spillway division pier on high arch dams can better improved flow pattern and characteristics of pressure on plunge pool slabs, which can enhance the efficiency of energy dissipation. But the cavitation of the division pier can not be neglected. The cavitation characteristics of Goupitan Hydropower Station with surface spillway division pier was studied by means of vacuum tank model test, in which detection techniques of underwater noise were adopted.The results indicate that the area of division pier is much possibly damaged,but the cavitation intensity was reduced clearly to cavitation initial stage in the modified scheme of adopting a circular arc.