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On the Selection of Sediment Transport Equations

by David T. Williams, USAE Waterways Experiment Station, Vicksburg, MS, USA,
Pierre Y. Julien, USAE Waterways Experiment Station, Vicksburg, MS, USA,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

Existing sediment transport relationships have been calibrated under a certain range of experimental conditions which can be described by the dimensionless grain size, the mobility number, and the dimensionless flow depth. For given stream flow conditions an index describing the number of parameters within the range of experimental values is defined. The applicability of four sediment transport equations for sand-bed channels under limited flow conditions (Slope equals 0. 0005 ft/ft and n equals 0. 02) can be assessed from the value of this index. Higher applicability is found at flow depths less than 2 ft. Low applicability is observed either at flow depths larger than 10 ft or for sediment sizes smaller than 0. 125 mm.

Subject Headings: Sediment transport | Grain (material) | Streamflow | Rivers and streams | Computer models | Channel flow | Bed materials

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