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

Q4 Environmental Science
Y. Zerihun
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Abstract

Abstract Subcritical 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.
梯形堰淹没水流的水力特性研究
公路和铁路堤防上的亚临界流是洪水事件中常见的问题,可以像梯形堰上的淹没流一样处理。在早期的研究中,这类堰的淹没流量方程是作为淹没程度和自由流量的函数来建立的。然而,在实践中应用该方程需要在自由流动条件下进行的实验中预先确定流量。本文从流向动量平衡方程推导出流量方程,克服了以往方法的不足。验证结果表明,该方程能够在实测值的±6.0%范围内预测梯形堰的沉流流量。通过对试验数据的系统分析,探讨了淹没溢流最突出的特征。对于这样的流动,自由面和河床压力曲线只有在堰的上游面上是自相似的。研究结果证实,淹没度和下游堰面坡度对淹没流特性有显著影响,但后者对非模块化流量的影响较小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Archives of Hydroengineering and Environmental Mechanics
Archives of Hydroengineering and Environmental Mechanics Environmental Science-Water Science and Technology
CiteScore
1.30
自引率
0.00%
发文量
4
期刊介绍: Archives of Hydro-Engineering and Environmental Mechanics cover the broad area of disciplines related to hydro-engineering, including: hydrodynamics and hydraulics of inlands and sea waters, hydrology, hydroelasticity, ground-water hydraulics, water contamination, coastal engineering, geotechnical engineering, geomechanics, structural mechanics, etc. The main objective of Archives of Hydro-Engineering and Environmental Mechanics is to provide an up-to-date reference to the engineers and scientists engaged in the applications of mechanics to the analysis of various phenomena appearing in the natural environment.
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