A three dimensional numerical model is introduced which is able to calculate the sediment transport rate and the according bed changes over time in river bends. The model was tested against data from laboratory experiments. Several detailed studies of the lateral bed load movement on side slopes were investigated to find the appropriate formulas describing the physical phenomena of sediment transport in alluvial channel bends. Considering a stability analysis of a sediment particle on a side slope, and introducing an appropriate algorithm which takes the characteristic movement of sediments in river bends into account, the calculated velocities as well as the bed level changes over time showed a good agreement with the measurements.
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