Abstract
A spillway with Trapezoidal Labyrinth Shaped steps (TLS) is proposed and investigated numerically. The results show that this spillway has better performance as it increases the magnification ratio LT/Wt (LT is the total edge length and Wt is the spillway width). A TLS stepped spillway is more effective for magnification ratios of 1.25, 1.45, 1.65 and 1.85 for energy dissipation compared to stepped spillways by 5.6, 8.5, 12.6 and 17% respectively. TLS stepped spillway has a lower residual head and a larger friction factor. The residual head ratio (Hres/dc) is ~2.89 in a TLS stepped spillway, while it is ~4.32 for a flat stepped spillway. Also, the friction factor varies from 0.79 to 1.33 for different magnification ratios, while this value is approximately 0.66 for the flat stepped spillway.
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