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Non-uniformity and layering in sediment transport modelling 2: river application

Author(s): Michael Tritthart; Marcel Liedermann; Bernhard Schober; Helmut Habersack

Linked Author(s): Michael Tritthart, Marcel Liedermann, Bernhard Schober, Helmut Habersack

Keywords: Bed-load; Danube River; empirical equation; numerical model; river flow; sediment transport

Abstract: The objectives of this research are to verify a numerical sediment transport model based on field data from a reach of the Austrian Danube River, to identify the influence of non-uniform bed-load transport modelling and the selected bed schematization on the simulation results and to investigate the cause and the numerical reproducibility of spatio-temporal variations found in field data. Simulation results based on variants of the transport equation by Meyer-Peter and Müller were compared to basket sampler and radio tracer stone observations. The best agreement was obtained for a non-uniform formulation with an exchange layer, while the uniform formulation of the transport equation underestimated the transport rates for discharges lower than the mean flow since it predicts a later onset of bed-load transport. The consideration of an exchange layer in the numerical code led to the prediction of bed-load sheets due to sorting waves, allowing the model to account for the spatio-temporal variability of field data.

DOI: https://doi.org/10.1080/00221686.2011.583487

Year: 2011

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