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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。
Aiming at the problem of serious scour of the downstream bank slope during discharge of Changyimiao Reservoir, on the basis of adding a pair of concentric curves at the section YD + 152.076-YD + 168.875 of the spillway tunnel in the front of Takenkang, Hanku made four kinds of tongue-shaped pick nose ridge modification program. By analyzing and comparing its hydraulic characteristics such as the distance, diffusion and erosion, it is finally considered that the hydraulic parameters of the scheme III are better, meeting the requirements of downstream energy dissipation and anti-scouring, and the construction difficulty is not great, which will be regarded as the final pick-nose ridge Program. In addition, by comparing the tongue picks with the original ones, the superiority of tongue picks in enhancing the horizontal diffusion of water flow is further clarified.