To protect the dam body and downstream area, spillways should be built. Because the difference in water level upstream and downstream spillways is usually very big, energy dissipation facilities should be introduced. Stepped spillways were discovered to immensely enhance energy dissipation. V-notch end sills installed on stepped spillways were not investigated enough. The challenge in using this type of end sills is to know the ideal angle of the notch. The second challenge is to link the energy dissipation percent and the scour hole characteristics with the hydraulic parameters of the spillway and the soil properties. This paper aims to investigate the V-notch end sills in stepped spillways and to assess their effect on energy dissipation and scour. For this purpose, physical models of four steps were built on stepped spillways in the laboratory. V-notch end sills were installed at the end of each step of the spillway. The dimensional analysis was used to link the various parameters influencing the studied phenomena. All V-notch end sill angles used enhanced energy dissipation, reduced the relative scour depth, length, and volume. Minimizing the angle of V-notch end sills enhanced energy dissipation. Three scour equations were developed to predict scour characteristics from easy-to-record measurements.

为了保护坝体和下游区域，应修建溢洪道。由于上游溢洪道和下游溢洪道的水位差异通常很大，因此应引入消能设施。人们发现阶梯式溢洪道极大地提高了能量耗散。对安装在阶梯式溢洪道上的V型槽底梁的调查不足。使用这种类型的门槛的挑战是要知道槽口的理想角度。第二个挑战是将能量耗散百分比和冲刷孔特性与溢洪道的水力参数和土壤特性联系起来。本文旨在研究阶梯式溢洪道中的V型槽底坎，并评估其对能量消散和冲刷的影响。为此，在实验室的阶梯式溢洪道上建立了四个步骤的物理模型。在溢洪道每一步的末尾都安装了V型缺口门槛。尺寸分析被用来链接影响所研究现象的各种参数。所有的V形槽底槛角都使用了增强的能量消散，减少了相对冲刷深度，长度和体积。最小化V型槽底梁的角度可增强能量耗散。开发了三个冲刷方程式，可根据易于记录的测量结果预测冲刷特性。