花凉亭水库溢洪道泄流冲刷破坏特性分析与治理方案

Characteristic analysis and treatment scheme of spillway discharge erosion failure of Hualiangting Reservoir

通过对溢洪道及下游泄流流态的观察与分析,揭示了右岸凸出的山嘴造成主流折冲并减小河道过水面积,同时下游水垫厚度不够和河道陡纵坡及横向大高差形成的水流能量聚集、消能不充分是花凉亭水库溢洪道下游在2016年和2020年洪水过程中发生冲刷破坏的主要原因。提出了以加固防护、平顺流态和二次消能为主要方式消减溢洪道下游冲刷与破坏的治理措施,为类似水库溢洪道下游整治和除险加固设计提供参考。

Through the observation and analysis of the spillway and the downstream discharge flow state,it is revealed that the protruding mouth on the right bank causes the mainstream to fold and reduce the water passage area of the river,and at the same time,the thickness of the downstream water cushion is not enough,and the steep longitudinal slope and lateral height difference of the river channel are large.Insufficient energy accumulation and energy dissipation of the water flow formed is the main reason for the scour damage in the downstream of the spillway of Hualiangting Reservoir during the floods in 2016 and 2020.The control measures to reduce the scour and damage downstream of the spillway are put forward mainly by reinforcement protection,smooth flow state and secondary energy dissipation,which can provide a reference for the downstream regulation and reinforcement design of similar reservoir spillways.