Semi‐Alluvial Channels and Sediment‐Flux‐Driven Bedrock Erosion

Bedrock channels are shaped by fluvial erosion, which is often described by the stream power model. However, recent research indicates that the applicability of the stream power model is limited. In particular, it has been shown in the laboratory that sediment transport strongly affects fluvial erosion rates of bedrock. Sediment can inhibit incision by covering and protecting the rock or increase it by providing tools for erosion. Thus, its amount and distribution determines the spatial and temporal distribution of erosion and provides a first-order control on channel morphology and dynamics. In general, bedrock channels are semi-alluvial. Here, current knowledge of bedrock channel morphology is summarized, with a special emphasis on the effect of sediment on erosion.