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 文摘: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
( 2 ) validate whether the crest elevation can meet the require of energy dissipation and erosion prevention during the beginning period of flood discharge . ( 3 ) calculate the altitude of downriver cofferdam , and make it meet the require of energy dissipation and erosion prevention . ( 4 ) calculate some average velocity of flow through some sections , including contracted section in stilling basins behind upriver cofferdam , if the hydraulic jump happen in lower reaches of the river . the program will calculate the average velocity of flow of contracted section and the length of the apron 主要设计内容包括：计算上游围堰后消力池的尺寸；验证泄洪初期坝面高程是否能够满足消能防冲需要；计算下游围堰堰顶高程，使其满足泄洪期围堰和坝体过流的消能防冲和工程进度的需要；计算部分断面平均流速，包括：上游围堰后消力池中收缩断面的断面平均流速；坝首和坝末的断面平均流速；当下游河道发生水跃时，计算下游河道的收缩断面平均流速及需要铺设护坦的长度。
