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  The effect of roughness spacing and size on lateral deflection of bedload particles

He, C., Yang, C.-J., Turowski, J. (2021): The effect of roughness spacing and size on lateral deflection of bedload particles. - Water Resources Research, 57, 10, e2021WR029717.
https://doi.org/10.1029/2021WR029717

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https://doi.org/10.6084/m9.figshare.12623654.v5 (Supplementary material)
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Described by: He, C., Yang, C.-J., Turowski, J. (2021): Supplementary Results for ‘The effect of roughness spacing and size on lateral deflection of bedload particles’. https://doi.org/10.6084/m9.figshare.12623654.v5

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 Creators:
He, Chuanqi1, Author              
Yang, Ci-Jian2, Author              
Turowski, J.2, Author              
Affiliations:
14.7 Earth Surface Process Modelling, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_1729888              
24.6 Geomorphology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146045              

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 Abstract: Bedrock river lateral erosion plays a crucial role in landscape evolution, sediment transport and deposition, and the occurrence of geohazards. Fluvial erosion of massive rock is largely driven by impacts of bedload particles, which also drives crack propagation to prepare blocks for plucking. In straight channels, bedload particles generally move parallel to the channel walls and thus need to be deflected laterally to cause wall erosion. Sideward deflection of bedload particles occurs when they interact with roughness elements fixed on the riverbed. Here, we isolated the interaction of moving bedload particles with roughness elements in laboratory experiments. We conducted 21 sets of flume experiments to systematically investigate how spacing (5, 10, 20, 30, 40, 50, and 60 mm) and size (5, 10, and 20 mm) of roughness elements influence sideward deflection of bedload particles in straight channels with relatively low flow depth and a localized roughness zone covering half of the channel width. Velocity changes by the first impact increase with the size of roughness elements. The deflection length and velocity peak at intermediate values of the spacing of roughness elements. The likelihood for a bedload particle to leave the roughness zone decays with the bedload particle’s distance to its edge. Our results suggest that lateral erosion rates in bedrock channels are dominantly controlled by the position of the roughness zone within the channel and its relation to the particle path.

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 Dates: 2021-09-242021
 Publication Status: Finally published
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 Identifiers: DOI: 10.1029/2021WR029717
GFZPOF: p4 T5 Future Landscapes
OATYPE: Hybrid - DEAL Wiley
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Title: Water Resources Research
Source Genre: Journal, SCI, Scopus
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Pages: - Volume / Issue: 57 (10) Sequence Number: e2021WR029717 Start / End Page: - Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals484
Publisher: American Geophysical Union (AGU)