Abstract
A conventional numerical river model that failed to adequately reproduce the erosion of a 20‐km stretch of a sand‐bed river is modified to allow a substantial proportion of the eroded material to be transported as wash load. This reflects the formation of the river plain from proglacial lake sediments, which commonly have a large silt fraction. Because wash load has practically no effect on the transport capacity, except at very high concentrations, less of the transport capacity is devoted to transport of already eroded material, and more to further erosion. By assuming the proportion of silt to be 40%, the observed erosion could be satisfactorily reproduced. The average wash‐load concentration that follows from this assumption is quite small.
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