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On the Hydraulic Characteristics of Submerged Flow over Trapezoidal-Shaped Weirs

On the Hydraulic Characteristics of Submerged Flow over Trapezoidal-Shaped Weirs AbstractSubcritical flows over highway and railway embankments, commonly encountered during flood events, can be treated like submerged flows over trapezoidal-shaped weirs. In earlier studies, the equation of the submerged-flow discharge for such types of weirs was developed as a function of the degree of submergence and free-flow discharge. However, the application of this equation in practice requires a pre-determined discharge from experiments performed under free-flowconditions. In this study, a discharge equation was deduced from the streamwise momentum balance equation, which overcomes the drawback of the previous approaches. The results of the validation demonstrated that the proposed equation is capable of predicting the submerged-flow discharge of a trapezoidal-shaped weir within ±6.0% of the measured value. Furthermore, the most prominent features of the submerged overflows were examined by systematically analyzing the experimental data. For such flows, the free-surface and bed-pressure profiles are self-similar only over the upstream face of the weir. Results of this investigation confirmed that the degree of submergence and the slope of the downstream weir face significantly affect the characteristics of the submerged flow, but the effect of the latter on the non-modular discharge is marginal. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Hydro-Engineering and Environmental Mechanics de Gruyter

On the Hydraulic Characteristics of Submerged Flow over Trapezoidal-Shaped Weirs

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Publisher
de Gruyter
Copyright
© 2023 Yebegaeshet T. Zerihun, published by Sciendo
ISSN
1231-3726
eISSN
2300-8687
DOI
10.2478/heem-2023-0001
Publisher site
See Article on Publisher Site

Abstract

AbstractSubcritical flows over highway and railway embankments, commonly encountered during flood events, can be treated like submerged flows over trapezoidal-shaped weirs. In earlier studies, the equation of the submerged-flow discharge for such types of weirs was developed as a function of the degree of submergence and free-flow discharge. However, the application of this equation in practice requires a pre-determined discharge from experiments performed under free-flowconditions. In this study, a discharge equation was deduced from the streamwise momentum balance equation, which overcomes the drawback of the previous approaches. The results of the validation demonstrated that the proposed equation is capable of predicting the submerged-flow discharge of a trapezoidal-shaped weir within ±6.0% of the measured value. Furthermore, the most prominent features of the submerged overflows were examined by systematically analyzing the experimental data. For such flows, the free-surface and bed-pressure profiles are self-similar only over the upstream face of the weir. Results of this investigation confirmed that the degree of submergence and the slope of the downstream weir face significantly affect the characteristics of the submerged flow, but the effect of the latter on the non-modular discharge is marginal.

Journal

Archives of Hydro-Engineering and Environmental Mechanics – de Gruyter

Published: Jan 1, 2023

Keywords: submerged-flow discharge; hydraulic structure; trapezoidal-shaped weir; flow measurement; subcritical flow; modular limit

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