Iranian Journal of Irrigation & Drainage

Iranian Journal of Irrigation & Drainage

Experimental Investigation of the Geometric Properties and Arrangement of Rectangular Cubical Blocks on Hydraulic Jump Control in a Rectangular Channel

Articles in Press

Document Type : Original Article

Authors
Ebrahim Asadi 1 ΒΆ
Alireza Javadi 2
Amin Seyedzadeh 3
1 Assistant Professor of Azerbaijan Shahid Madani University - Department of Civil Engineering, Tabriz, Iran. asadi@azaruniv.ac.ir
2 Department of Civil Engineering, Faculty of Technology and Engineering, Shahid Madani University of Azerbaijan.
3 Department of Water Science and Engineering, Faculty of Agricultural Engineering, Fasa University
10.22034/idj.2026.556062.2638
Abstract
The hydraulic jump is a key phenomenon in hydraulic engineering, playing a vital role in energy dissipation and the protection of downstream structures. This study presents an experimental investigation into the effects of using rectangular cubes in a zigzag arrangement on the characteristics of a hydraulic jump in a rectangular channel. The experiments were conducted in a flume with a width of 0.5 meters for initial Froude numbers ranging from 1.5 to 19.1. The independent variables included the relative block height (h/b = 2, 3, 4) and the relative longitudinal spacing between their rows (s/b = 1, 2, 4). A quantitative comparison of the laboratory data with the baseline (smooth bed) showed that the presence of these blocks leads to a reduction in the sequent depth and jump length, as well as an increase in energy dissipation. Analysis revealed that the block height parameter has a more dominant effect than the longitudinal spacing. Specifically, blocks with a relative height of 4, compared to a height of 2, resulted on average in an additional 57% to 69% reduction in the sequent depth and an additional 24% to 32% reduction in the jump length. The maximum increase in relative energy dissipation (16.4%) was also associated with the configuration featuring the greatest height and spacing.
Keywords
Hydraulic jump
Sequent depth
Jump length
Energy dissipation
Stilling basin
Iranian Journal of Irrigation & Drainage

Articles in Press, Accepted Manuscript
Available Online from 06 February 2026