No-choke flow in USBR standard horseshoe channel cross-section

Author:

Bijankhan Mohammad1,Darvishi Elham1

Affiliation:

1. Irrigation and Reclamation Engineering Department, University of Tehran, Karaj, Iran

Abstract

Choking problems occur in transitions that have a bed rise higher than a maximum allowable value. Due to the complexity of the United States Bureau of Reclamation (USBR) horseshoe cross-section, a time-consuming trial-and-error procedure is inevitable as a way to determine the maximum allowable bed rise. This paper presents straightforward solutions to calculate a choke-free maximum bed rise for practical changes in bed elevations. The maximum relative errors associated with the proposed equations are less than 1%. A graphical solution is presented to obtain the upstream operating ranges based on non-dimensional specific energy curves. In addition, a direct relationship is developed to determine the critical depth in the transition zone which bears less than 1% relative error. Finally, a choking solution is discussed by considering the energy head loss occurred in the channel transition zone.

Publisher

Thomas Telford Ltd.

Subject

Water Science and Technology

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Direct solutions for normal and critical depths in standard city-gate sections;Flow Measurement and Instrumentation;2012-12

2. Editorial;Proceedings of the Institution of Civil Engineers - Water Management;2011-06

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