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Bed Shear from Velocity Profiles: A New Approach

Vedula, Subrahmanyam and Achanta, Ramakrishna Rao (1987) Bed Shear from Velocity Profiles: A New Approach. In: Journal of Hydraulic Engineering, 113 (2). pp. 682-683.

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A new binary law of velocity distribution has been developed to describe the velocity profile for the entire flow region. The law is a combination of logarithmic law, valid in the wall (inner) region, and parabolic law, valid in the core (outer) region of the flow. The validity of the law has been established based on earlier data on flat plates, rough and smooth pipes and experimental data obtained from rigid-walled open channels with plane sand beds. A procedure of estimating bed shear stress from the proposed law of velocity distribution using the measured velocity profile has been evolved. Bed shear estimates made according to this procedure are in agreement with the values obtained from uniform flow analysis in the case of open channel flow over a sediment bed. The proposed method of estimating the bed shear stress from the observed velocity profiles is found to be particularly useful in cases where it is difficult to determine precisely the true bed level, such as in the case of flow over sediment beds.

Item Type: Journal Article
Publication: Journal of Hydraulic Engineering
Publisher: American Society of Civil Engineers
Additional Information: copy right of this article belongs to American Society of Civil Engineers.
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 09 Jul 2009 05:58
Last Modified: 23 Feb 2012 06:15
URI: http://eprints.iisc.ac.in/id/eprint/21367

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