中文摘要：

本文针对某水利枢纽溢洪道与河道轴线近乎垂直,泄流量范围大情况下存在的泄洪消能问题,通过比尺为1：60的模型试验,对比连续式挑坎和燕尾挑坎的水力特性,在燕尾挑坎基础上提出了一种阵列式燕尾坎,研究了阵列式燕尾坎的挑流及冲刷特性。试验结果表明：阵列式燕尾坎可将水舌分为多股,实现水舌在有限空间内的充分拉伸扩散,增大水舌落点范围,掺气效果明显,射流进入下游河道后产生的旋滚范围及强度均明显减小,河床冲刷减弱,有效保护两岸免受冲刷,充分解决了溢洪道与河道交角较大时消能防冲问题,相关成果可为类似工程提供参考。

英文摘要：

This article focuses on flood discharge and energy dissipation problems in a hydropower station-the spillway is designed with a great range of capacity but its axis is nearly normal to the direction of river mainstream. For this spillway, we have developed a new swallow-tailed array flip bucket and examined its hydraulics and scour power using laboratory tests on a 1：60 scale model and comparing it with a continuous flip bucket and a swallow-tailed flip bucket. The experiment showed that the new flip bucket split the jet nappe into a multi-strand flow, making the water jet sufficiently stretched in a limited space. The multi-strand nappe was aerated obviously and falling down on the scour pool surface over an area larger than that of the other two flip buckets. The scope and intensity of the fluctuations caused by nappe plunging into the scour pool was decreased significantly so that its power of scour on the riverbed and river banks were much lowered. Thus, the swallow-tailed array flip bucket is an effective device of energy dissipation and erosion control for spillways with a large crossing angle to the river mainstream.