Choke-Free Flow in Circular Channels with Increase in Bed Elevations
Publication: Journal of Irrigation and Drainage Engineering
Volume 124, Issue 6
Abstract
Physical solutions for the flow through circular channels due to increase in bed elevations are obtained, satisfying the condition of choke-free flow. In this analysis, three different cases of channel transitions, commonly found in practice, are considered. They are (1) when the channel bed is raised with the formation of a flat base; (2) when the channel bed is raised due to change in position of the centerline; and (3) when the channel bed is raised due to decrease in channel diameter. Considering a smooth and gradual transition zone, the equations of energy and continuity are solved for the subcritical approaching flow regime to determine the maximum limiting rise in bed elevation. Using the continuity equation of the upstream flow, the ranges of the upstream flow depths are also obtained for the choke-free condition.
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References
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Allen, R. F.(1980). “Steady solution for river flow.”J. Hydr. Div., ASCE, 106(4), 608–611.
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Dey, S.(1994). “No-choke flow in trapezoidal channels.”J. Engrg. Mech., ASCE, 120(10), 2224–2231.
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Dey, S., Dey, A., Bajpai, S., and Singh, A. K. (1990). “Design and flow operation of triangular and parabolic channels without choke.”Indian J. Power and River Valley Development, 40(5–6), 71–74.
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Liong, S. Y.(1984). “Channel design and flow operation without choke.”J. Irrig. and Drain. Engrg., ASCE, 110(4), 403–407.
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Copyright © 1998 American Society of Civil Engineers.
History
Published online: Nov 1, 1998
Published in print: Nov 1998
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