عنوان مقاله [English]
نویسندگان [English]چکیده [English]
Stilling basins are short lengths of paved channels placed at the end of spillways and any source of supercritical flow to control the hydraulic jump, therefore shortening the lengths of stilling basins will economically be feasible. The purpose of this study is to investigate the characteristics of hydraulic jump in divergent channels on inverse slopes. The results showed that the divergence and the inverse slope of the channel had noticeable effects on the hydraulic jump characteristics. It was shown that the divergence and inverse slope reduced sequent depth ratios and length of hydraulic jump and furthermore the channel divergence increased the relative head loss of the jump. However in channels with inverse slope there was not any remarkable change in relative head loss compared with the classical jump. Therefore, the role of channel divergence in the relative head loss of the hydraulic jump might be considered more than the role of inverse slope. The results also revealed that the reduction of 37.22 percent at sequent depth ratios and 61 percent at the length of hydraulic jump were evident compared with the classical jump. The relative head loss of the hydraulic jump in a divergent channel on inverse slope was 54 percent greater than the classical jump’s one. Therefore, the divergent channel with inverse slope could be used as an energy dissipator to control the hydraulic jumps.