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DOI | 10.1038/s41467-018-03990-7 |
River-bed armouring as a granular segregation phenomenon | |
Ferdowsi, Behrooz1,2,3; Ortiz, Carlos P.2,4; Houssais, Morgane5; Jerolmack, Douglas J.2 | |
2017-11-08 | |
发表期刊 | NATURE COMMUNICATIONS |
ISSN | 2041-1723 |
出版年 | 2017 |
卷号 | 8 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | River bed-load transport is a kind of dense granular flow, and such flows are known to segregate grains. While gravel-river beds typically have an "armoured" layer of coarse grains on the surface, which acts to protect finer particles underneath from erosion, the contribution of granular physics to river-bed armouring has not yet been investigated. Here we examine these connections in a laboratory river with bimodal sediment size, by tracking the motion of particles from the surface to deep inside the bed, and find that armour develops by two distinct mechanisms. Bed-load transport in the near-surface layer drives rapid, shear rate-dependent advective segregation. Creeping grains beneath the bed-load layer give rise to slow but persistent diffusion-dominated segregation. We verify these findings with a continuum phenomenological model and discrete element method simulations. Our experiments suggest that some river-bed armouring may be due to granular segregation from below-rather than fluid-driven sorting from above-while also providing new insights on the mechanics of segregation that are relevant to a wide range of granular flows. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000414662500004 |
WOS关键词 | GRAVEL-BED STREAMS ; PARTICLE-SIZE SEGREGATION ; LAMINAR SHEARING FLOWS ; BEDLOAD TRANSPORT ; SLOW RELAXATION ; LOAD TRANSPORT ; STRESS ; LAYER ; TRANSITION ; COMPACTION |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/203790 |
专题 | 资源环境科学 |
作者单位 | 1.Princeton Univ, Dept Geosci, Princeton, NJ 08544 USA; 2.Univ Penn, Earth & Environm Sci, Philadelphia, PA 19104 USA; 3.Univ Minnesota, Natl Ctr Earth Surface Dynam 2, Third Ave SE, Minneapolis, MN 55414 USA; 4.Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA; 5.CUNY City Coll, Benjamin Levich Inst, New York, NY 10031 USA |
推荐引用方式 GB/T 7714 | Ferdowsi, Behrooz,Ortiz, Carlos P.,Houssais, Morgane,et al. River-bed armouring as a granular segregation phenomenon[J]. NATURE COMMUNICATIONS,2017,8. |
APA | Ferdowsi, Behrooz,Ortiz, Carlos P.,Houssais, Morgane,&Jerolmack, Douglas J..(2017).River-bed armouring as a granular segregation phenomenon.NATURE COMMUNICATIONS,8. |
MLA | Ferdowsi, Behrooz,et al."River-bed armouring as a granular segregation phenomenon".NATURE COMMUNICATIONS 8(2017). |
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