Abstract
Abstract In this paper, the hydraulic properties of the finite-crested stepped spillway (FCSS) including discharge coefficient (Cd) and the ratio of energy dissipation (EDR) were experimentally investigated. Results indicated that the Cd of the FCSS changes between 0.9 and 1.2, while the ratio of the upstream head to the length of the crest (hup/Lc) changes between 0.25 and 1.8. The hup/Lc is the main parameter affecting the Cd. The value hup/Lc equal to 0.6 is a good criterion for designing the crest of the FCSS. At this point, the Cd of FCSS is about 1.0. The performance of FCSS regarding the EDR changes between 95 and 40 percent. By increasing the discharge of flow and skimming flow formation, the performance of the FCSS related to energy dissipation is dramatically decreased.
Highlights
Water resources management, especially flood control, is one of the most important actions for the development of human societies
A spillway usually consists of guide walls, approach channel, crest, chute, and an energy dissipator placed at the toe of the chute
As presented in the dimensional analysis, the hydraulic properties of the finite-crested stepped spillway (FCSS) including Cd and EDR is the function of the relative upstream head, the slope of the downstream stepped chute (ratio of the height of steps to their lengths: (S), the number of steps (N), the Froude number (Fr), Weber number (We) and Reynolds number (Re)
Summary
Especially flood control, is one of the most important actions for the development of human societies. Felder & Chanson ( ) studied the impact of non-uniformity in height of steps on energy dissipation and flow regime. They stated that the effect of nonuniformity of the step’s height on increasing energy dissipation is negligible and makes the flow pattern unstable. Roushangar et al ( ) using laboratory studies investigated the discharge coefficient of the Broad crest stepped spillway They reported the experimental Cd values vary from 0.58 to 0.64 for nappe flow, and from 0.59 to 0.7 for the skimming flow regime. In this study, the finite-crested stepped spillways are proposed and their hydraulic properties including the Cd and its ability in energy dissipation is investigated
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