Jet Flow on Stepped Spillways
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VIEW THE REPLYPublication: Journal of Hydraulic Engineering
Volume 120, Issue 2
Abstract
This technical note presents a method to estimate the energy loss on stepped spillways for the jet‐flow regime, which occurs when the ratio of the critical depth to the height of the step is less than approximately 0.8. It introduces the concept of , the proportional energy loss per step, and using the extensive experimental results of Horner, ; was evaluated. It was found that is a function of and , where is the length of the step; and an equation has been developed that describes this variation. It was also found that the energy loss on a stepped spillway with a large number of steps can be very significant in the jet‐flow regime. It also appears that for skimming flow, which occurs for larger than about 0.8, the average energy loss per step would be less than that for jet flow.
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References
1.
Essery, I. T. S., and Horner, M. W. (1971). “The hydraulic design of stepped spillways,” Rep. 33, Construction Industry Research and Information Assoc., London, U.K.
2.
Horner, M. W. (1969). “An analysis of flow on cascades of steps,” PhD thesis, Univ. of Birmingham, U.K.
3.
Moore, W. L. (1943). “Energy loss at the base of a free overfall.” Trans. ASCE, 108, 1343–1392.
4.
Rajaratnam, N. (1990). “Skimming flow in stepped spillways.” J. Hydr. Engrg., ASCE, 116(4), 587–591.
5.
Stephenson, D. (1991). “Energy dissipation down stepped spillways.” Water Power and Dam Construction, U.K., 43(9), 27–30.
6.
Sorensen, R. M. (1985). “Stepped spillway hydraulic model investigation.” J. Hydr. Engrg., ASCE, 111(12), 1461–1472.
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Copyright © 1994 American Society of Civil Engineers.
History
Received: Jan 14, 1993
Published online: Feb 1, 1994
Published in print: Feb 1994
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