Design of Stilling Basins using Artificial Roughness

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Design of Stilling Basins using Artificial Roughness

Oiginal Article, B28
Nasr Esfahani MJ, Shafai Bejestan M.
J. Civil Eng. Urban. 2(4): 159-163. 2012.

ABSTRACT: Various types of hydraulic jumps have been analyzed experimentally, theoretically and numerically and the results are available in the literature. In this paper, very large series of experimental data are collected and used to develop a design equation for the optimal stilling basin with cube roughness elements. The experiments were conducted in a wide laboratory flume to study the effect of roughness parameters on the length of the roughened floor. Roughness elements are distributed in a staggered way. Two different heights of roughness were considered. The results of this study show the attractiveness of rough beds for energy dissipation below hydraulic structures. It was found that increasing the roughness length doesn’t make great difference in energy loss, but the roughness height is very impressive at the hydraulic jump characteristics. Compared with the smooth bed, the rough beds decrease the relative the relative jump sequent depth by 5.3-12.76%. The axial velocity profiles at different sections in the jump were found to be similar, with some differences from the Profile of the simple plane wall jet.
Keywords:Hydraulic jump, Abrupt Drop, Rough beds

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