Evaluation of Sediment Transport and Friction Factor Equations Using MOBED

by Bommanna G. Krishnappan, Natl Water Research Inst, Burlington, Ont, Can,
Peter Engel, Natl Water Research Inst, Burlington, Ont, Can,

Abstract: Three sediment transport rate equations and the same number of friction factor equations for mobile boundary channel flows were evaluated using a mobile boundary flow model called MOBED. The MOBED model was formulated in such a way that it is possible to use different friction factor and sediment transport relations easily. The model was used to simulate degradation downstream of a transition from fixed bed to movable bed in a laboratory flume using the nine possible combinations of sediment transport rate and friction factor equations. Comparing the predicted degradation and water surface elevation with the measured data, it was possible to draw conclusions regarding the suitability of different combinations of the selected equations.

Subject Headings: Sediment transport | Hydrologic models | Friction | Domain boundary | Channel flow | Transport rates | Chemical degradation | Rivers and streams

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