Upper-Regime Plane Bed
Publication: Journal of Hydraulic Engineering
Volume 124, Issue 11
Abstract
The analysis of a laboratory and field data set for sand-bed channels defines the characteristics of upper-regime plane bed with sediment transport. The occurrence of upper-regime plane bed relates to the laminar sublayer thickness δ and depends on shear velocity u*, median grain size d50, and grain shear Reynolds number R*. Two different boundary conditions are recognized: (1) Transition to hydraulically smooth when R* < 11.6; and (2) transition to hydraulically rough when R* > 11.6. In the first case, upper-regime plane bed is obtained when ≅gδ, where g is the gravitational acceleration. In the second case, upper-regime plane bed is observed when d50≅ 2δ. Temperature effects are possible when R* approaches 11.6, which explains the observations on the Missouri River. Resistance to flow for plane bed with sediment transport increases with the Shields parameter.
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Published In
Journal of Hydraulic Engineering
Volume 124 • Issue 11 • November 1998
Pages: 1086 - 1096
Copyright
Copyright © 1998 American Society of Civil Engineers.
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Published online: Nov 1, 1998
Published in print: Nov 1998
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