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Probabilistic Modeling of Bed-Load Composition.
- Source :
-
Journal of Hydraulic Engineering . Feb2004, Vol. 130 Issue 2, p129-139. 11p. - Publication Year :
- 2004
-
Abstract
- This paper proposes that the changes which occur in composition of the bed load during the transport of mixed-grain-size sediments are largely controlled by the distributions of critical entrainment shear stress for the various size fractions. This hypothesis is examined for a unimodal sediment mixture by calculating these distributions with a discrete particle model and using them in a probabilistic calculation of bed-load composition. The estimates of bed-load composition compare favorably with observations of fractional transport rates made in a laboratory flume for the same sediment, suggesting that the hypothesis is reasonable. The analysis provides additional insight, in terms of grain mechanics, into the processes that determine bed-load composition. These insights strongly suggest that better prediction methods will result from taking account of the variation of threshold within size fractions, something that most previous studies have neglected. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 07339429
- Volume :
- 130
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Journal of Hydraulic Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 11978708
- Full Text :
- https://doi.org/10.1061/(ASCE)0733-9429(2004)130:2(129)