Distribution of Bed Shear Stress in Rotating Circular Flume
Publication: Journal of Hydraulic Engineering
Volume 130, Issue 4
Abstract
Distributions of bed shear stress across the width of a rotating circular flume with smooth and rough bed surfaces were obtained by measurement and model prediction. Results with flows over smooth beds showed that the flow in the central part may be considered to be two-dimensional and that effects of flow depth over the operating range of the flume are minor for flow depths not exceeding 0.14 m. For rough beds, the bed shear stress distributions were found to be skewed toward the inner wall. This can be corrected if a compensating roughness is added to the bottom of the ring. Such measures are also effective for flumes with smooth beds. Measured bed shear stress distributions agreed well with the predicted distributions for smooth beds and reasonably well for rough beds. The modified Preston tube, for measurement of bed shear stress in flows over rough beds, was found to give promising results. Further tests are required to completely define the uncertainty in bed shear stress measurements made with this instrument.
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Published In
Journal of Hydraulic Engineering
Volume 130 • Issue 4 • April 2004
Pages: 324 - 331
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Oct 22, 2002
Accepted: Sep 26, 2003
Published online: Mar 15, 2004
Published in print: Apr 2004
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