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He, Chuanqi等,WATER RESOURCES RESEARCH,2021

发表时间:2021-11-25编辑:王德珲点击:

The Effect of Roughness Spacing and Size on the Lateral Deflection of Bedload Particles

作者

He, CQ (He, Chuanqi)   Yang, CJ (Yang, Ci-Jian)   Turowski, JM (Turowski, Jens M.)  

(由 Clarivate 提供)

 

57  

10  

文献号

e2021WR029717

DOI

10.1029/2021WR029717

出版时间

OCT 2021

文献类型

Article

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摘要

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.

关键词

 

作者信息

通讯作者地址

Turowski, Jens M.    

(通讯作者)

German Res Ctr Geosci GFZ, Potsdam, Germany    

 

电子邮件地址

jens.turowski@gfz-potsdam.de  

类别/分类

研究方向

Environmental Sciences & Ecology   Marine & Freshwater Biology   Water Resources

基金资助