Estimation of Friction Factor in Open Channels
Publication: Journal of Hydrologic Engineering
Volume 15, Issue 3
Abstract
Using a large set of field and laboratory data, this study investigated the effect of slope and the Shields parameter on the friction factor. It identified the ranges of critical shear stress and bed slope for which Froude number would or would not play an important role in the evaluation of friction. It was found that the prediction of friction factor for slopes less than 0.000 81 was not satisfactory. For the Shields parameter range of and the range of slope of 0.000 82–0.01, the prediction of friction factor was satisfactory even without considering the effect of Froude number. On the other hand, the inclusion of Froude number improved the estimation of friction factor for the range of and steeper slopes (0.01–0.02). Finally, in gravel/sand rivers in Iran, friction factor can be estimated whether or not the flow velocity is known.
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Information
Published In
Journal of Hydrologic Engineering
Volume 15 • Issue 3 • March 2010
Pages: 249 - 254
Copyright
© 2010 ASCE.
History
Received: Feb 19, 2009
Accepted: Sep 4, 2009
Published online: Sep 14, 2009
Published in print: Mar 2010
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