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. Several studies have demonstrated the importance ofalluvial cover; furthermore, several mathematical models have also beenintroduced to predict the alluvial cover on bedrock channels. Here, weprovide an extensive review of research exploring the relationship betweenalluvial cover, sediment supply and bed topography of bedrock channels,describing various mathematical models used to analyse the deposition ofalluvium. To test one-dimensional theoretical models, we performed a seriesof laboratory-scale experiments with varying bed roughness under simpleconditions without bar formation. Our experiments show that alluvial coveris not merely governed by increasing sediment supply and that bed roughnessis an important controlling factor of alluvial cover. A comparison betweenthe experimental results and the five theoretical models shows that ( 1 ) twosimple models that calculate alluvial cover as a linear or exponentialfunction of the ratio of the sediment supplied to the capacity of the channel produce good resultsfor rough bedrock beds but not for smoother bedrock beds; ( 2 ) two roughnessmodels which include changes in roughness with alluviation and a modelincluding the probability of sediment accumulation can accurately predictalluvial cover in both rough and smooth beds; and ( 3 ), however, except for amodel using the observed hydraulic roughness, it is necessary to adjustmodel parameters even in a straight channel without bars.

Alluvial cover on bedrock channels: applicability of existing models