Abstract: Based on experimental result of energy dissipation and scour protection for downstream of spillway at Yu Jian Kou power station, this paper discusses the flow characteristics, aerated characteristics of flaring gate pier for low dam pivot, the influence on pressure of dam surface and the result of energy dissipation for flaring gate pier.It is put forward to be an available method to solve the problems of energy dissipation and scour protection for depth of covering strata, poor geologic condition and weakness of resistance to scour capability under reasonable use of flaring gate piers and auxiliary dissipaters.Thus, a new method is obtained for release of floodwater and energy dissipation of low dam pivot which are provided with low water head, great unit discharge and low Froud coefficient.It may be used for reference for design and test workers.

Key words: low dam pivot, flat gate pier, flaring gate pier, aeration, result of energy dissipation

摘要： 结合鱼剑口电站坝下消能防冲试验研究成果,对低坝枢纽宽尾墩的水流特点、掺气特性、宽尾墩对大坝泄流能力和坝面压力的影响以及宽尾墩的消能效果等问题进行了初步探讨,提出了合理地使用宽尾墩结合辅助消能设施可有效地解决坝下覆盖层深,地质条件差,抗冲能力弱的低坝枢纽的消能防冲问题,从而为具有低水头,大单宽流量,低佛氏数特点的低坝枢纽泄洪消能开辟了一条新途径,可供有关低坝枢纽设计与试验工作者借鉴与参考.

关键词: 低坝枢纽, 平尾墩, 宽尾墩, 掺气, 消能效果