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Chapter
Apr 26, 2012

Application of Modified Log-Wake Law in Open-Channels

Publication: World Environmental and Water Resource Congress 2006: Examining the Confluence of Environmental and Water Concerns

Abstract

We extend the modified log-wake law, which was developed for turbulent pipe and boundary layer flows, to open-channel turbulence. Like those in pipes and boundary layers, turbulent velocity profile in open-channels can be approximated with three components: (1) the law of the wall that results from the constant bed shear stress; (2) the law of the wake that reflects the effects of gravity, secondary currents and bed roughness; and (3) the cubic correction near the maximum velocity. The modified log-wake law compares very well with experimental data from Coleman, Lyn, Kironoto and Graf and Sarma et al. It also replicates the measured velocity profile of cross-section of the Mississippi River. In particular, it can well model the velocity dip phenomenon in open-channels where the conventional log-wake law fails.

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Go to World Environmental and Water Resource Congress 2006
World Environmental and Water Resource Congress 2006: Examining the Confluence of Environmental and Water Concerns
Pages: 1 - 9

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Published online: Apr 26, 2012

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Department of Civil Engineering, University of Nebraska, PKI 204D, 1110 S 67th Street, Omaha, NE 68182-0178.E-mail: [email protected]
Pierre Y. Julien [email protected]
Department of Civil Engineering, ERC, Colorado State University, Fort Collins, CO 80523.E-mail: [email protected]

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