Experimental investigation of the effect of submerged jet on hydraulic asymmetrical jump characteristics in corrugated bed

Document Type : Research Paper


1 Department of Hydraulics Structures, Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

2 Water Engineering and Environment Faculty, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

3 Department of Civil, Environmental and Architectural Engineering, University of L’Aquila, L’Aquila, Italy


Hydraulic jump is a phenomenon in which the flow changes from a supercritical state to a subcritical state. As a result of the phenomenon of hydraulic jump, the flow depth is significantly increased in a relatively short way and according to its increasing, the flow speed and energy is reduced. Dropping down the energy of the flow before to transfer downstream is a solution to prevent possible damages to the canal bed and downstream structures. The formation of hydraulic jump was done on rough beds with different shapes such as triangular, cubic, rectangular and trapezoidal and sinusoidal beds and the results showed that the rough bed had a significant effect in reducing the length of hydraulic jump. The purpose of this study is to investigate the effect of the counterflow jet and bed roughness on the energy dissipation of the structure. Certainly, increasing the energy loss of the structure is affected the downstream hydraulic jump conditions and the length of the stilling basin. The results obtained from the present research showed that the combination of bed roughness and submerged jets as an energy dissipation system significantly improve the flow pattern and the primary characteristics of the hydraulic jump.


Main Subjects

  • Receive Date: 19 July 2023
  • Revise Date: 12 December 2023
  • Accept Date: 13 December 2023
  • Publish Date: 13 December 2023