许家崖水库溢洪道消能防冲方案模型试验研究

Model tests on energy dissipation and anti-erosion schemes of Xujiaya reservoir spillway

许家崖水库溢洪道中的水流为低弗劳德数水流,消能不充分是这类工程布置中的普遍问题。此外,溢洪道进口后方的弯道一定程度上恶化了溢洪道中的流态。为了得出更为合理的布置及消能防冲方案,通过模型试验的方法,从底流消能和挑流消能两个方面,分别对原设计方案进行优化,在各种优化方案的基础上对比了单级消力池消能方式、两级消力池消能方式和挑流消能方式之间的水流流态和消能效果,最终推荐挑流消能方式为工程较为经济合理的消能形式。

Flow on the Xujiaya spillway is featured with a low Froude number and inadequate energy dissipation that is a common problem in similar projects. Another factor that worsens the flow condition to a certain extent is the bend downstream the spillway inlet. To find a reasonable energy dissipation scheme, a model spillway was experimentally tested to modify the original design and optimize its energy dissipation effects. Three types of schemes were compared： single-stage stilling basin, two-stage stilling basin, and trajectory bucket. The effects of energy dissipation and flow regimes in each scheme were optimized through testing and examining different design alternatives, and the trajectory bucket design was finalized as the economic and reasonable energy dissipation scheme for this reservoir spillway.