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

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.