Abstract: Based on the basic equations of hydraulics and the conservation of the sum of pressure and momentum on the section of conjugate water depth of the closed pipe when hydraulic jump occurs which exerts pressure on the pipe, the cause reasons of serious cavitation damage of gate shaped culvert pipe of a small reservoir operating with normal water level are calculated and analyzed. Results show that it is because of the cavitation and erosion caused by unfavourable flow regime in the pipe. Accordingly, prevention measures are put forward, for reference.

Key words:  , gate shaped culvert pipe, flow control by gate, cavitation, prevention measure

摘要： 采用水力学基本方程与封闭管道内发生有压水跃时其共轭水深断面的压力动量和守恒原理，计算分析了某小（1）型水库城门形坝下涵管正常蓄水位运行工况下发生严重蚀损破坏的原因，明确揭示系管内不良流态引发的空化空蚀所致，提出了相应措施防空化空蚀破坏。

关键词: 城门形涵管, 设闸控流, 空蚀, 防治措施