Effect of Size Gradation on Transport of Sediment Mixtures
Publication: Journal of Hydraulic Engineering
Volume 124, Issue 8
Abstract
Total bed-material load computations for nonuniform sediment mixtures were evaluated for the commonly used Engelund and Hansen, Ackers and White, and Yang transport formulas. The results of sediment transport computations indicate considerable scatter is in bed-material load transport relations for nonuniform sediment mixtures. The analysis demonstrates that a single fixed size, such as D35 or D50, cannot reflect the presence of various size fractions on the transport of nonuniform sediment mixtures. A size gradation compensation factor incorporates the effect that the size distribution has on the transport of sediment mixtures. The size gradation compensation factor, Kg, which is a function of the geometric standard deviation, σg, of the bed material and the flow conditions, in conjunction with the D50 of the bed material yields an equivalent representative diameter, De. By including De in the Engelund and Hansen, Ackers and White, and Yang formulas, the agreement between computed and measured bed-material concentrations was improved significantly. These results for 118 sets of laboratory and field data were further verified by the use of Colorado State University (CSU) experimental data that include three different σg values for the same median sediment size.
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Published In
Journal of Hydraulic Engineering
Volume 124 • Issue 8 • August 1998
Pages: 786 - 793
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: Aug 1, 1998
Published in print: Aug 1998
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