Articles | Volume 7, issue 4
https://doi.org/10.5194/esurf-7-949-2019
https://doi.org/10.5194/esurf-7-949-2019
Research article
 | 
09 Oct 2019
Research article |  | 09 Oct 2019

Experiments on patterns of alluvial cover and bedrock erosion in a meandering channel

Roberto Fernández, Gary Parker, and Colin P. Stark

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Cited articles

Abad, J. D. and Garcia, M. H.: Experiments in a high-amplitude Kinoshita meandering channel: 1. Implications of bend orientation on mean and turbulent flow structure, Water Resour. Res., 45, W02401, https://doi.org/10.1029/2008WR007016, 2009a. 
Abad, J. D. and Garcia, M. H.: Experiments in a high-amplitude Kinoshita meandering channel: 2. Implications of bend orientation on bed morphodynamics, Water Resour. Res., 45, W02402, https://doi.org/10.1029/2008WR007017, 2009b. 
Aubert, G., Langlois, V. J., and Allemand, P.: Bedrock incision by bedload: insights from direct numerical simulations, Earth Surf. Dynam., 4, 327–342, https://doi.org/10.5194/esurf-4-327-2016, 2016. 
Beer, A. R. and Turowski, J. M.: Bedload transport controls bedrock erosion under sediment-starved conditions, Earth Surf. Dynam., 3, 291–309, https://doi.org/10.5194/esurf-3-291-2015, 2015. 
Beer, A. R., Kirchner, J. W., and Turowski, J. M.: Graffiti for science – erosion painting reveals spatially variable erosivity of sediment-laden flows, Earth Surf. Dynam., 4, 885–894, https://doi.org/10.5194/esurf-4-885-2016, 2016. 
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Short summary
This paper describes the case of a meandering bedrock river with loose sediment on the bed. In such rivers, the sediment hits and erodes the bed as it moves with the flow. We did experiments in a laboratory flume to identify the areas where the sediment moves and those where it deposits. We discovered that the size and location of those areas change with the amount of sediment in the channel and its curvature. The fluctuations of sediment cover over the bed drive the erosion potential.