An Experimental Investigation of the Relative Length of Hydraulic Jump in a Rectangular Channel with a Composite Section, Featuring a Rough Major Bed and Positive Slope

Authors

  • Djamel Besser UDERZA Unit, Faculty of Technology, University of El Oued, 39000 El Oued, Algeria
  • Ali Ghomri Research Laboratory in Underground and Surface Hydraulics, University of Biskra, Department of Hydraulics and Civil Engineering, University of El Oued, Algeria
  • Haroun Khechiba UDERZA Unit, Faculty of Technology, University of El Oued, 39000 El Oued, Algeria
  • Ibtissam Herri UDERZA Unit, Faculty of Technology, University of El Oued, 39000 El Oued, Algeria
Volume: 15 | Issue: 5 | Pages: 26676-26682 | October 2025 | https://doi.org/10.48084/etasr.11629

Received: 21 April 2025 | Revised: 12 May 2025, 4 June 2025, and 9 June 2025 | Accepted: 14 June 2025 | Online: 15 August 2025


Corresponding author: Djamel Besser

Abstract

Hydraulic jumps occur when the flow shifts from supercritical to subcritical, forming a standing wave with a sudden increase in the water surface elevation in the channel. This transition gives rise to a turbulent zone, where surface rollers are generated, leading to vigorous water mixing, air entrainment, and significant dissipation of water energy. The present study deals with hydraulic jumps in a rectangular channel, having a composite section characterized by a rough major bed (made of uniform plastic granules) and a positive slope under various flow circumstances. The hydraulic characteristics were assessed for varying bed roughness and positive slopes, focusing on the relative length of the hydraulic jump (Lj/h1) and flow rate. The experimental data analysis revealed that the roughness of the main bed and the channel slope affect the Lj/h1 ratio. The extensive data on the hydraulic jumps in rough channel beds have facilitated the development of mathematical models to represent the Lj/h1 ratio as a function of roughness and slope factors.

Keywords:

hydraulic jump, relative length of the hydraulic jump, slope, compound rectangular channel, rough major bed

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How to Cite

[1]
D. Besser, A. Ghomri, H. Khechiba, and I. Herri, “An Experimental Investigation of the Relative Length of Hydraulic Jump in a Rectangular Channel with a Composite Section, Featuring a Rough Major Bed and Positive Slope”, Eng. Technol. Appl. Sci. Res., vol. 15, no. 5, pp. 26676–26682, Oct. 2025.

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Copyright (c) 2025 Djamel Besser, Ali Ghomri, Haroun Khechiba, Ibtissam Herri

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