Modes of Bed-Load Movement on a Smooth Rigid Surface

Sediment grains transported as supply-limited bed load on a rigid surface move either discretely or collectively as bed forms, with significantly different effective grain speeds and active storage volumes. The adopted mode has implications for sediment sorting and heavy mineral placer formation, di...

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Bibliographic Details
Published inJournal of hydraulic engineering (New York, N.Y.) Vol. 137; no. 10; pp. 1283 - 1286
Main Authors James, C. S, Bulovic, N, Naidoo, E
Format Journal Article
LanguageEnglish
Published Reston, VA American Society of Civil Engineers 01.10.2011
Subjects
Applied sciences
Buildings. Public works
Computation methods. Tables. Charts
Exact sciences and technology
Hydraulic constructions
Structural analysis. Stresses
TECHNICAL NOTES
Bedform
Motion
Experimental result
Hydraulics
Bed loads
Reynolds number
Bed load
Particle transport
Rigid bed
Sediments
Modeling
Sediment transport
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Summary:Sediment grains transported as supply-limited bed load on a rigid surface move either discretely or collectively as bed forms, with significantly different effective grain speeds and active storage volumes. The adopted mode has implications for sediment sorting and heavy mineral placer formation, dispersal of grain-associated pollutants, and accumulation and flushing of sediment deposits in unlined canals and sewers. The threshold condition between the two modes has been established for a smooth surface from flume experiments with different sediment types, flow conditions, and sediment supply rates. This is expressed in terms of a relationship between the sediment movability number, a dimensionless bed load parameter, and a grain shear Reynolds number.
ISSN:0733-9429
1943-7900
DOI:10.1061/(ASCE)HY.1943-7900.0000400