某阶梯溢洪道与光滑溢洪道水力特性对比

Hydraulic Characteristics Comparison of Stepped Spillway and Smooth Spillway

某溢洪道工程原设计方案采用光滑溢洪道,但光滑溢洪道出口流速较大,挑距较远,对右岸岸坡造成冲刷破坏。对此,提出采用阶梯溢洪道替换光滑溢洪道的设计方案。为定量分析两种溢洪道水力特性,采用水工模型试验与数值模拟试验相结合的方法做了对比分析。结果表明,阶梯溢洪道的消能率明显大于光滑溢洪道的消能率,有效减小了溢洪道出口流速和挑距,避免了对下游岸坡的冲刷,该修正方案合理。研究成果可为类似工程提供参考。

The outlet velocity and jet trajectory length in the original design of spillway project with smooth spillway were large,and it caused the scour of right bank.Affected by the downstream terrain,the stepped spillway was used to replace the smooth spillway.The hydraulic characteristics of smooth spillway and the stepped spillway were compared by using the numerical simulation method and physical model test.The results show that the energy dissipation rate of the stepped spillway is larger than that of smooth spillway and it can effectively reduce the outlet velocity and jet trajectory length to avoid damaging the downstream bank slope;the smooth spillway replaced by the stepped spillway was reasonable.The research provides reference for the similar projects.