Particle Densimetric Froude Number for Estimating Sediment Transport
Publication: Journal of Hydraulic Engineering
Volume 129, Issue 6
Abstract
It has been established that for ratios of flow depth to bed particle diameter less than ten (flow on very rough boundaries) neither the Reynolds number of the solid loose particles at a stream bed nor the Shields parameter are adequate variables to predict critical flow conditions for the initiation of motion. A particle densimetric Froude number (where U=mean velocity, s=ratio of sediment and fluid densities, g=acceleration due to gravity, and D=characteristic diameter of bed particle) is here proposed as an alternative criterion to predict hydraulic conditions for the initiation of motion. Values of critical F* were computed after calibration with available experimental data sets. After the critical conditions for the initiation of particle motion were exceeded, transport of bed particles was established. In order to evaluate the performance of a transport equation that contains F* in sediment transport, a set of the most employed formulations to estimate bed material transport in steep slope macrorough flows were tested. The comparison of the results shows that F* can be used to accurately predict sediment discharge.
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Published In
Journal of Hydraulic Engineering
Volume 129 • Issue 6 • June 2003
Pages: 428 - 437
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Mar 30, 2001
Accepted: Jan 21, 2003
Published online: May 15, 2003
Published in print: Jun 2003
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