多股挑、跌流水舌作用下基岩冲刷平衡深度  

Limiting scour depth in water cushion pools produced by multiple jets

作　　者：孙建[1] 李玉柱[1] 余常昭[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2002年第2期266-269,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"九五"重点科技攻关项目 ( 96 -2 2 1-0 5 -0 1-0 2 )

摘　　要：分析了多股挑、跌流水舌在水垫中扩散的水力特点 ,提出多股水舌在完全混合扩散区能量汇聚 ;以卡里巴、塔贝拉等工程原型冲坑资料为准 ,引入基岩抗冲水深 ,提出多股挑、跌流水舌作用下冲坑水深的估算方法 ;用小湾表、中孔多股挑、跌流作用下的试验值进行比较 ,表明预报公式可行。Analysis of the hydraulic characteristics of multiple jets from a high arch dam impinging a water cushion pool shows that the water jet energy instantly increases as the water jets completely merge into a single jet.Observations of scour depths at the Kariba Arch Dam, the Tabela dam, etc. were used to develop a formula to estimate the scour depth. The predicted values agree well with the experimental scour depths due to multiple layers of water jets from the top spillways and the middle outlets of Xiaowan Arch Dam. The results can be used to design water cushion pools.

关 键 词：拱坝 水垫塘 多股水舌 冲刷平衡深度 基岩 冲坑水力计算 冲坑水深 泄洪消能 

分 类 号：TV135.23[水利工程—水力学及河流动力学]