Article: Hydraulic characteristics of combined weir-gate structure Journal: International Journal of Hydrology Science and Technology (IJHST) 2025 Vol.19 No.5 pp.1 - 17 Abstract: Hydraulic structures are used for multiple purposes, such as measuring discharge, controlling flow, reducing flood risks. Weir structures are designed for flow passing over them, while sluice gates are designed for flow passing beneath them. This study used combined weir-gate structures (a folded structure made up of two planar walls inclined at various angles to the channel making a triangular arrangement in plan) with four interior angles (60, 90, 120, and 180)° and two triangular openings at the top and bottom of the combined structure. There are four types of flow according to combined structure operation. The results show that the discharge coefficient values increased when the interior angle increased at the same upstream head values, the average percentage increasing values are 27%, 48%, and 54% respectively concerning lower interior angles, because of decreasing crest length. Four empirical equations for Cd were predicted for every case of flow and compared with their experimental values with percentage error not exceeding 20% and coefficient of determination R2 reached 0.99. Inderscience Publishers - linking academia, business and industry through research

Title: Hydraulic characteristics of combined weir-gate structure

Authors: Noor I. Khattab; Azza N. Altalib; Arwa A. Mullah

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

Abstract: Hydraulic structures are used for multiple purposes, such as measuring discharge, controlling flow, reducing flood risks. Weir structures are designed for flow passing over them, while sluice gates are designed for flow passing beneath them. This study used combined weir-gate structures (a folded structure made up of two planar walls inclined at various angles to the channel making a triangular arrangement in plan) with four interior angles (60, 90, 120, and 180)° and two triangular openings at the top and bottom of the combined structure. There are four types of flow according to combined structure operation. The results show that the discharge coefficient values increased when the interior angle increased at the same upstream head values, the average percentage increasing values are 27%, 48%, and 54% respectively concerning lower interior angles, because of decreasing crest length. Four empirical equations for C_d were predicted for every case of flow and compared with their experimental values with percentage error not exceeding 20% and coefficient of determination R² reached 0.99.

Keywords: weir; sluice gate; combined structure; weir-gate structure; discharge coefficient; empirical equation; open channel hydraulics.

DOI: 10.1504/IJHST.2025.144936

International Journal of Hydrology Science and Technology, 2025 Vol.19 No.5, pp.1 - 17

Received: 12 Oct 2024
Accepted: 08 Dec 2024
Published online: 11 Mar 2025 *

Title: Hydraulic characteristics of combined weir-gate structure

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