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globalchange > 过去全球变化的重建

DOI:	10.1371/journal.pone.0088657
论文题名:	How River Rocks Round: Resolving the Shape-Size Paradox
作者:	Gabor Domokos; Douglas J. Jerolmack; Andras Á. Sipos; Ákos Török
刊名:	PLOS ONE
ISSN:	1932-6203
出版年:	2014
发表日期:	2014-2-12
卷:	9, 期:2
语种:	英语
英文关键词:	Rivers ; Curvature ; Sediment ; Convergent evolution ; Simulation and modeling ; Ellipsoids ; Limestone ; Partial differential equations
英文摘要:	River-bed sediments display two universal downstream trends: fining, in which particle size decreases; and rounding, where pebble shapes evolve toward ellipsoids. Rounding is known to result from transport-induced abrasion; however many researchers argue that the contribution of abrasion to downstream fining is negligible. This presents a paradox: downstream shape change indicates substantial abrasion, while size change apparently rules it out. Here we use laboratory experiments and numerical modeling to show quantitatively that pebble abrasion is a curvature-driven flow problem. As a consequence, abrasion occurs in two well-separated phases: first, pebble edges rapidly round without any change in axis dimensions until the shape becomes entirely convex; and second, axis dimensions are then slowly reduced while the particle remains convex. Explicit study of pebble shape evolution helps resolve the shape-size paradox by reconciling discrepancies between laboratory and field studies, and enhances our ability to decipher the transport history of a river rock.
URL:	http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0088657&type=printable
Citation statistics:
资源类型:	期刊论文
标识符:	http://119.78.100.158/handle/2HF3EXSE/17946
Appears in Collections:	过去全球变化的重建影响、适应和脆弱性科学计划与规划气候变化与战略全球变化的国际研究计划气候减缓与适应气候变化事实与影响

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File Name/ File Size	Content Type	Version	Access	License
journal.pone.0088657.PDF（663KB）	期刊论文	作者接受稿	开放获取	CC BY-NC-SA	View Download

作者单位:

Department of Mechanics, Materials and Structures, Budapest University of Technology and Economics, Budapest, Hungary;Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America;Department of Mechanics, Materials and Structures, Budapest University of Technology and Economics, Budapest, Hungary;Department of Construction Materials and Engineering Geology, Budapest University of Technology and Economics, Budapest, Hungary

Recommended Citation:

Gabor Domokos,Douglas J. Jerolmack,Andras Á. Sipos,et al. How River Rocks Round: Resolving the Shape-Size Paradox[J]. PLOS ONE,2014-01-01,9(2)

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