Journal of New Approaches in Water Engineering and Environment
Scientific Journal

Analysis of the Hydraulic Performance of a Middle-Hinged Gate in Weir and Gate Modes

Document Type : Original Article

Authors

samira salamati
mohsen masoudian

Department of Water Engineering, Sari University of Agricultural Sciences and Natural Resources, Mazandaran, Iran.

https://doi.org/10.22034/nawee.2025.484734.1111
Abstract
Gates are devices used to regulate flow rates or water levels. A middle-hinged gate can operate as a weir, a gate, or a combination of both by rotating around its hinge. This study analyzes the hydraulic performance of the middle-hinged gate in three modes using a laboratory model. The structure of the middle-hinged gate model is constructed from two equal parts without lateral compression, rotating around a central hinge. Experiments were conducted in a rectangular, non-sloping channel measuring 3.7 meters in length and 14 centimeters in width. The experimental results indicate that in the weir mode, when the blade rotates in the upper half, at sharp angles (30 degrees), with rotating downstream at a constant upstream water height, an average of 3.17% more discharge passes through it. As the angle increases, the direction of rotation (upstream or downstream) has little effect on flow rate changes. In the gate mode, at a constant upstream water height, after an angle of 90 degrees, both the angle and the direction of rotation do not affect the discharge. Additionally, in the weir-gate mode, at a constant water height, an increase in angle in the weir (the gate angle is 30° and the weir angle increases from 30° to 45°) has 48.6% less discharge than the same increase in the gate mode (the weir angle is 30° and the gate angle increases from 30° to 45).

Keywords

Hinged Gate
middle-hinged
discharge coefficient
Weir-gate
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Journal of New Approaches in Water Engineering and Environment
Volume 4, Issue 1
March 2025
Pages 40-53

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