溢洪洞出口挑流鼻坎优化试验研究  

Optimizing Experimental Study on Jet Bucket of Flood Discharge Tunnel Export

作　　者：陈小威[1] 张宗孝[1] 刘冲[1] 杜麦 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048

出　　处：《电网与清洁能源》2016年第7期143-148,共6页Power System and Clean Energy

摘　　要：针对长益庙水库泄洪时下游岸坡淘刷严重这一问题,在挑坎前段溢洪洞YD+152.076-YD+168.875断面加了一对同心圆弯道的基础上,对原方案挑流鼻坎形式做了4种舌形挑流鼻坎修改方案。通过分析比较其挑距、扩散、冲刷等水力特性,最终认为修改方案三各水力参数较优,满足下游消能防冲要求,且施工难度不大,将之定为最终的挑流鼻坎推荐方案。另外,通过各舌形挑坎和原方案挑坎的对比分析,进一步明确了舌形挑坎在增强水流横向扩散方面的优越性。In view of the serious flood scouring on the downstream bank when flood water is discharged from Changyi- miao reservoir, in addition to adding a concentric circle bend to YD＋152.076 to YD＋168.875 section of the spillway tunnel, this paper presents 4 modification for the original jet bucket type. Through comparison and analysis of hydraulic characteris- tics such as trajectory distance, divergent width and degree of depth of the scour hole, it is finally concluded that No 3 modification scheme is of better hydraulic parameters and is able to satisfy the energy dissipation and erosion control of the downstream, and is easier to be built. Therefore, the scheme is recommended as the final jet bucket scheme. In addition, through comparisons of each tongue-type jet buckets with the original jet bucket, the advantages of the jet bucket with tongue-type on expanding the degree of nappe by lateral diffu- sion are further ascertained.

关 键 词：模型试验 舌形挑坎 优化 水力特性 冲刷 

分 类 号：TV131[水利工程—水力学及河流动力学]