Abstract
The effect on flow resistance in uniform flat‐bed open‐channel flows due to suspended sediment is investigated. Flows with and without an equilibrium sand bed are studied in a laboratory channel. Three well‐sorted natural sands are used. Point velocity measurements, as well as estimates of local wall shear, are obtained with a laser‐Doppler anemomentry system, and are used to evaluate friction factors. The results indicate that, contrary to recent models, the presence of suspended sediment does not necessarily lead to a reduction in flow resistance, but will generally result in an increase. The relation between changes in the velocity profile and changes in friction factors is discussed.
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