The Effect of Adding Geometric Configurations in Pool of Fishway on The Flow Pattern and Maximum Velocity

Section: Research Paper
Issue
Vol. 30 No. 1 (2025): Volume 30 Issue 1
Published
Mar 1, 2025
Pages
1-13

Abstract

Fish passes are hydraulic structures widely used to facilitate the migration of fish groups and contribute to maintaining their diversity in rivers with natural flow barriers, both environmentally and biologically. These passes are designed with various engineering modifications, resulting in flow patterns with hydraulic characteristics suitable for specific fish species. This study aims to analyze the hydraulic characteristics of flow, including maximum flow velocity and flow pattern in a standard vertical slot fish pass and its sensitivity to modifications in the pass shape by adding geometric structures in the form of letters L, T, and I inside the basin. A laboratory model was constructed at a 1:4 scale, testing four incline values of 5%, 6.25%, 7.5%, and 8.75%. For each incline, five discharges were tested for the standard shape (without modifications) at 3.83, 5.89, 7.89, 9.69, and 12.41 l/sec. For the modified shapes, three discharges were tested at 3.83, 7.89, and 12.41 l/sec. Results showed that flow in the standard design exhibited three patterns, with the second pattern being the most favorable and the first pattern the least desirable, typically forming with higher discharges. Regarding maximum velocity, it increased with the incline and discharge. When modifying the pass shape, only two patterns were formed, the second and third patterns, eliminating the undesirable pattern. The modifications also contributed to reducing the maximum velocity, especially when the modification changed the flow pattern from the least favorable to the most favorable. The maximum reduction in maximum velocity reached 28.22%, and higher values of velocity reduction ratio were associated with higher discharges. Therefore, these modifications are crucial, especially for high discharges.

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Authors

omar yousif AL-Gohishe

Dams and Water Resources Engineering Department, College of Engineering, University of Mosul, Mosul, Iraq

Mena Ahmed Alsawaf

Dams and Water Resources Engineering Department, Collage of Engineering, University of Mosul, Mosul, Iraq.

Identifiers

https://doi.org/10.33899/rengj.2023.141456.1268
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How to Cite

[1]
omar yousif AL-Gohishe, عمر, M. Ahmed Alsawaf, and مینا, “The Effect of Adding Geometric Configurations in Pool of Fishway on The Flow Pattern and Maximum Velocity”, AREJ, vol. 30, no. 1, pp. 1–13, Mar. 2025.
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