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Effect of Particle Gradation of Bed Material on Transport of Nonuniform Sediments

Authors:

K. P. P. Pathirana ,

University of Peradeniya, LK
About K. P. P.

Senior Lecturer, Department of Civil Engineering

BSc. Eng. (Hons)(Peradeniya). M.Eng., Ph.D., C.Eng., FIE (SL), MICE

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K. P. J. S. Kumara,

University of Peradeniya, LK
About K. P. J. S.

Department of Civil Engineering

B.Sc. Eng. (Hons.)

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T. B. S. Priyashantha,

University of Peradeniya, LK
About T. B. S.

Department of Civil Engineering

BSc. Eng. (Hons.)

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S. B. Darshana

University of Peradeniya, LK
About S. B.

Department of Civil Engineering

BSc. Eng. (Hons.)

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Abstract

The effect of particle gradation on sediment transport rates of nonuniform sediment mixtures was investigated. The application of existing sediment transport formulae which are based on a single fixed grain diameter was found to be inappropriate to estimate transport rates for sediment mixtures. An equivalent sediment diameter defined by using a size gradation compensation factor (Kg) relating the particle gradation and flow characteristics was used in the Engelund and Hansen formula to predict the transport rates of sediment mixtures. The formulation of the Kg factor was an improved version of the one suggested by Molinas and Wu [6] to extend the applicability of the method over a wide range of sediment sizes. The proposed method was tested against the data obtained from a series of laboratory experiments conducted over a movable bed with different sediment gradations. The significant improvement of computed sediment transport rates indicates the superiority of the improved formulation of the Kg factor in accounting for the effect of size gradation on transport rates. By correlating different non-dimensional parameters, a new relationship was found for Kg, which could be readily applicable for sediment mixtures to compute transport rates over a wide range of sediment sizes.
How to Cite: Pathirana, K.P.P. et al., (2006). Effect of Particle Gradation of Bed Material on Transport of Nonuniform Sediments. Engineer: Journal of the Institution of Engineers, Sri Lanka. 39(2), pp.32–41. DOI: http://doi.org/10.4038/engineer.v39i2.7184
Published on 20 Apr 2006.
Peer Reviewed

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