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Geometry effects on energy dissipation over stepped spillway
conference contributionposted on 2017-01-01, 00:00 authored by Udai Jahad, Riyadh Al-AmeriRiyadh Al-Ameri, Lloyd ChuaLloyd Chua, Subrat DasSubrat Das
The stepped spillway is a hydraulic structure, mostly used in dams. Normally, stepped spillways were designed to increase the energy dissipation level and hence decrease the risks at downstream. The current experimental investigation includes two groups of scale models, each with four different variables, to investigate the impact of step shape on flow characteristics and energy dissipation. The two groups were defined based on the downstream slope of the spillway (group one angle =26.6°, and group two angle = 21.8°). The test results with dimensional analyses confirms the significant influence of the geometrical parameters, namely, the height of step h, the radius of the end sill, and the number of steps N, on the energy loss process. Furthermore, at small values of discharge (at Nappe flow regime) the energy dissipation is the largest. Any increase in discharge will affect the flow regime and the energy dissipation, while any increase in the step number (N) will increase the energy dissipation.