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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 4: Responding to Shifting Water Resources : Laboratory studies on the cavitation potential of stepped spillways
Laboratory studies on the cavitation potential of stepped spillways
Author : K.W. Frizell1 and F.M. Renna2
The development of roller-compacted concrete (RCC) in the 1980’s spurred a resurgence in the design and construction of stepped spillway chutes worldwide. New designs have stretched the limits on head and specific discharges, resulting in renewed discussions of cavitation potential. The uncertainty of cavitation formation and possible damage has led to conservative design approaches to limit specific discharge and include forced aeration ramps. Atmospheric and reduced-pressure modelling were performed at the Bureau of Reclamation’s Denver laboratory on a sectional model of a stepped spillway for two channel slopes and one step height. Extensive measurements were used to characterize basic parameters such as friction factor, mean flow and time-averaged turbulence properties as well as the incipient cavitation index. The results show that cavitation can form in nonaerated flows on stepped spillways and the incipient cavitation index is related to the friction coefficient Cf of these uniformly distributed macro-roughness elements.
File Size : 1,648,737 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 4: Responding to Shifting Water Resources
Date Published : 01/07/2011
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