摘要
部分河岸式溢洪道出口河道狭窄、曲折,岸坡陡峻,河床基础抗冲能力较差,采用挑流消能时挑射水流会砸落淘刷护坦、挑流鼻坎基础,危及下游岸坡稳定安全。为验证泄洪挑射水流形态及其对河床、岸坡的冲刷影响,以民乐河水库工程为例,通过水工模型试验进行分析并对挑流鼻坎体型进行优化。试验结果表明,溢洪道挑流鼻坎采用斜切坎配合折流器体型能有效改善挑射水流流态,对下游河床、岸坡的冲刷影响较小,可确保工程安全运行。
The outlet channel of some river- bank spillways are characterized as narrow and zigzag with steep slopes and riverbed foundation of poor anti- scouring ability. When ski- jump energy dissipation is selected for this type of spillway,the ski-jump flow may hit and scour the apron and flip bucket foundation,which will endanger the downstream slope stability. In order to verify the deflecting flow hydraulic geometry and its scouring influence on riverbed and bank slope,the spillway of Minlehe Reservoir was taken as a case,hydraulic model test was carried out to optimize the shape of flip bucket. The test result shows that bevel- type flip bucket with deflector can improve the flow geometry and has little influence on downstream riverbed and slope,which will ensure the safety operation of the project.
出处
《人民长江》
北大核心
2016年第19期83-86,共4页
Yangtze River
关键词
溢洪道
挑流消能
斜切挑坎
水工模型试验
spillway
ski-jump energy dissipation
bevel-type flip bucket
hydraulic model test
