Estimation of Gravel-Bed River Flow Resistance
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Volume 124, Issue 10
Abstract
Numerous formulations have been proposed linking friction factors to the gravel-bed river downstream hydraulic geometry. Data from 280 rivers show that existing gravel-bed power and semilogarithmic formulations fail to correctly predict the friction factors. A new gravel-bed semilogarithmic formulation is developed using nonlinear statistical tools. It considers the influence of the relative roughness, the Froude number, the sediment mobility parameter, and a cross-sectional form factor. The best fit is achieved by modifying the adjustment parameter and the interior of the logarithmic term of the universal velocity distribution equation.
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Published In
Journal of Hydraulic Engineering
Volume 124 • Issue 10 • October 1998
Pages: 1054 - 1058
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: Oct 1, 1998
Published in print: Oct 1998
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