Bed Load Discharge Coefficient

by Peter Engel, Research Engr.; Environmental Hydr. Sect., Hydr. Div., National Water Research Inst., Burlington, Ontario Canada,
Y. Lam Lau, Head; Environmental Hydr. Sect., Hydr. Div., National Water Research Inst., Burlington, Ontario, Canada,


Serial Information: Journal of the Hydraulics Division, 1981, Vol. 107, Issue 11, Pg. 1445-1454


Document Type: Journal Paper

Discussion: Havinga Hendrik (See full record)
Closure: (See full record)

Abstract: Using dimensional analysis, the bed-load discharge coefficient for the case of two-dimensional flow over dunes is expressed in terms of bed-form geometry and the sand size of the bed material. Experiments are conducted in a rectangular flume using artifical dunes and a flow visualization method to measure the flow separation length from which the bed-load coefficients were determined. The results show that the bed-load coefficient is affected significantly by sand-grain size only when the dunes are flat. When dunes are steep, the value of the bed-load coefficient is affected mainly by the dune steepness. Application of the bed-load coefficient results in some improvement of estimating bed load.

Subject Headings: Bed loads | Dunes | Flow measurement | Two-dimensional analysis | Two-dimensional flow | Sand (hydraulic) | Bed materials | Flow separation

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