Author(s)

J. Espinoza, J. Rojas, P. Martinez-Austria & I. Caldino

Abstract

An experimental study in a shallow channel was carried out to investigate the characteristics of bed forms and their relationships to friction factor and sediment transport. The experiments were done in a sediment and water recirculating channel of 20 m x 1 m. The taxonomy of bed forms related to flow velocity and sand concentrations was obtained (the analysis was restricted to ripples and dunes with superposed ripples). The laboratory experimental data obtained for steady state flow starting from a flat bed indicated that as the flow velocity was increased, the bed form changed from ripples to dunes with superposed ripples. It was found a great influence of the bed forms in the suspended concentration transport rate and the friction factors. The predicted values of local concentra

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