Experimental Investigation of One-Cycle Triangular Labyrinth Weirs with an Upstream Pool
Publication: Journal of Irrigation and Drainage Engineering
Volume 146, Issue 7
Abstract
The hydraulic performance of triangular labyrinth weirs with an upstream pool was experimentally studied in both free and submerged flow conditions. The discharge coefficients based on channel width and the weir length were calculated from experimental data. It was found that the additional length provided by the pool can significantly increase the capacity of the new weir design. The tested weir models were found efficient and required less concrete in comparison with classical labyrinth weirs for a relatively low head water to weir height ratio of . Empirical formulations were developed to predict the discharge coefficient and the critical depth of flow for labyrinth weirs with an upstream pool. The discharge reduction factor of the new weir design was found to be slightly lower than the value of sharp-crested weirs. Performance of the tested weir models in submerged flow condition was directly compared with the sharp-crested weirs. It was found that the submerged flow discharges of the tested weir models were significantly higher than the corresponding submerged flow discharge in sharp-crested weirs. A power law model was proposed to predict the submerged flow discharge from a given water head. The superior performance of labyrinth weirs with an upstream pool over classical labyrinth and sharp-crested weirs in both free and submerged flow conditions make them a suitable choice as a flow measuring device, depth regulator, and flood control structure.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request such as head-discharge and ADV measurements.
Acknowledgments
The experimental study presented here was partially supported by the NSERC-Discovery Grant No. 421785. The author is thankful to his undergraduate students (Abel Raath, HabenRussom, and Dumitru Liubeznii) for their help with conducting the laboratory measurements.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 146 • Issue 7 • July 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Oct 28, 2019
Accepted: Feb 11, 2020
Published online: Apr 28, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 28, 2020
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