Discharge Coefficient and Head Loss under Sluice Gates with Small Opening
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Volume 147, Issue 12
Abstract
The water flow under a high-dam gate with a small opening has rarely been studied. The discharge coefficient and head loss under sluice gates are studied experimentally, with the relative gate opening less than 0.10, including the free and submerged flow. The semiempirical formula for the discharge coefficient is proposed, which is used to estimate the overflow capacity of the free and submerged flows with a relatively small gate opening. The equation of the bed friction head loss of the submerged flow in the boundary layer is derived by using boundary-layer theory. The local head loss and the head loss caused by the flow turbulence in the eddy area are estimated, respectively. The results show that for the free flow, the inflection point of the vertical contraction coefficient, discharge coefficient, and total-head-loss coefficient varying with the relative gate opening was 0.04. The head loss caused by the flow turbulence in the eddy area played a leading role in the total head loss for submerged flow. The results can provide a reference for the design and operation of high-dam deep-hole gates.
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All data, models, and code generated or used during the study appear in the published article.
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Journal of Irrigation and Drainage Engineering
Volume 147 • Issue 12 • December 2021
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© 2021 American Society of Civil Engineers.
History
Received: Apr 21, 2021
Accepted: Jul 30, 2021
Published online: Sep 16, 2021
Published in print: Dec 1, 2021
Discussion open until: Feb 16, 2022
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