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孔口泄流是一种在自由泄流调洪中用得较多的方式，它能在水位上升时控制泄流量增大而更有效地调洪。对于其泄洪特性，研究了半喇叭口式和刀刃式孔口。介绍实验及计算研究的情况。
The orifice discharge is a more used method of free discharge and flood control, which can control the discharge and increase the flood more effectively when the water level rises. For its flood release characteristics, semi-bell mouth and knife-edge ports were studied. Introduction of experimental and computational research.