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Improving sediment discharge prediction for overbank flows, Page 1 of 2

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The Ackers and White (Journal of Hydraulic Division, ASCE, 1973, 99, No. NY11, 2041–2060) and the Yang (Journal of Hydrology, 1979, 40, 123–138) sediment transport formulae, both based on the stream power theory, were applied to experimental data for sediment transport during overbank flow obtained from the large-scale UK Flood Channel Facility and the small-scale Ulster Channel. Comparisons between different velocity calculation methods were made. A simple calculation method for predicting the main channel mean velocity has been proposed. The Conveyance Estimation System, the Lambert and Myers (Proceedings of the Institution of Civil Engineers, Water, Maritime & Energy, 1998, 130, No. 2, 84–94) method and the new proposed method gave good prediction of the mean main channel velocity and were tested for use with the Ackers and White and Yang sediment transport formulae. Comparisons between computed and measured sediment discharge indicated that the Yang formula used with an accurate velocity prediction method gave better prediction for the sediment discharge.