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Experimental hydraulic study for the effect of radial gates operation scheme on flow characteristics.

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Bibliographic Details
Title: Experimental hydraulic study for the effect of radial gates operation scheme on flow characteristics.
Authors: Ibraheem, Ahmed M.1 (AUTHOR) eng.ahmedmahmoud2009@yahoo.com, Ibrahim, Mohamed M.2 (AUTHOR)
Source: ISH Journal of Hydraulic Engineering. Feb2026, Vol. 32 Issue 1, p122-141. 20p.
Subjects: Discharge coefficient, Fluid flow, Hydraulic control systems, Weirs, Gating system (Founding), Hydraulic measurements, Hydraulic jump, Statistical models
Abstract: The Egyptian irrigation system considers barrage regulators important structures for controlling flow discharge and upstream/downstream water levels. This study presents an experimental model simulating flow across radial gates, focusing on how symmetric and asymmetric gate operation schemes influence hydraulic behavior. A total of 80 test runs were performed using five gate-operating schemes under 16 flow conditions, including four tailwater depths (0.21, 0.23, 0.25, and 0.27 m) and four discharges (26, 29, 32, and 35 L/s), while maintaining a constant upstream depth of 0.40 m. Results showed good agreement between measured and calculated discharge coefficients compared with previous studies. Gate operation symmetry, under similar expansion ratios, had minimal effect on the discharge coefficient. The contraction coefficient was inversely related to the gate leaf angle. The length of the hydraulic jump increased with the increase in the Froude number. The outcomes gave good agreement compared to other formulas under similar hydraulic conditions. The submergence ratio increased with the increase in the submerged hydraulic jump length. A regression analysis model was applied, and simple empirical equations were derived to predict the discharge coefficient and the hydraulic jump length under limited flow conditions. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:The Egyptian irrigation system considers barrage regulators important structures for controlling flow discharge and upstream/downstream water levels. This study presents an experimental model simulating flow across radial gates, focusing on how symmetric and asymmetric gate operation schemes influence hydraulic behavior. A total of 80 test runs were performed using five gate-operating schemes under 16 flow conditions, including four tailwater depths (0.21, 0.23, 0.25, and 0.27 m) and four discharges (26, 29, 32, and 35 L/s), while maintaining a constant upstream depth of 0.40 m. Results showed good agreement between measured and calculated discharge coefficients compared with previous studies. Gate operation symmetry, under similar expansion ratios, had minimal effect on the discharge coefficient. The contraction coefficient was inversely related to the gate leaf angle. The length of the hydraulic jump increased with the increase in the Froude number. The outcomes gave good agreement compared to other formulas under similar hydraulic conditions. The submergence ratio increased with the increase in the submerged hydraulic jump length. A regression analysis model was applied, and simple empirical equations were derived to predict the discharge coefficient and the hydraulic jump length under limited flow conditions. [ABSTRACT FROM AUTHOR]
ISSN:09715010
DOI:10.1080/09715010.2025.2591665