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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 original design of a spillway project adopted a smooth spillway. However, the outlet flow of the smooth spillway was relatively large and the distance between the spillway and the spillway was far. This caused erosion and damage to the right bank slope. In this regard, proposed the use of stepped spillway to replace the smooth spillway design. In order to quantitatively analyze the hydraulic characteristics of the two types of spillways, a comparative analysis was made using a combination of hydraulic model tests and numerical simulation tests. The results show that the energy dissipation rate of the stepped spillway is obviously larger than that of the smooth spillway, which effectively reduces the flow rate and the distance of the spillway exit and avoids the erosion of the downstream bank slope. This amendment scheme is reasonable. The research results can provide reference for similar projects.