| DOI: | 10.1002/2014GL060991
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| 论文题名: | Generalized sorting profile of alluvial fans |
| 作者: | Miller K.L.; Reitz M.D.; Jerolmack D.J.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9671
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| EISSN: | 1944-9402
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| 出版年: | 2014
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| 卷: | 41, 期:20 | | 起始页码: | 7191
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| 结束页码: | 7199
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| 语种: | 英语
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| 英文关键词: | alluvial fan
; downstream fining
; equal mobility
; gravel-sand transition
; selective transport
; sorting
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| Scopus关键词: | Gravel
; Landforms
; Particle size analysis
; Sand
; Size distribution
; Alluvial fans
; Control channels
; Downstream distances
; downstream fining
; Laboratory datum
; Nonequilibrium behavior
; Selective transport
; Sharp transition
; Sorting
; alluvial fan
; boundary condition
; gravel
; mobility
; particle size
; size distribution
; sorting
; threshold
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| 英文摘要: | Alluvial rivers often exhibit self-similar gravel size distributions and abrupt gravel-sand transitions. Experiments suggest that these sorting patterns are established rapidly, but how - and how fast - this convergence occurs in the field is unknown. We examine the establishment of downstream sorting patterns in a kilometer-scale alluvial fan. The sharp transition from canyon to unconfined, channelized fan provides a well-defined boundary condition. The channel changes from deep and entrenched at the fan apex to shallow and depositional over a short distance, exhibiting nonequilibrium behavior. The resulting gravel-fining profile is not self-similar; the particle size distribution narrows until approximate equal mobility is achieved. Downfan, the gravel-sand transition appears to exhibit a self-similar form; field and laboratory data collapse when downstream distance is normalized by the location of the transition. Results suggest a generalized sorting profile for alluvial fans as a consequence of the threshold of motion and nonequilibrium channels. Key Points Gravel sorting is limited by equal mobility of the grain size distributionThe gravel-sand transition exhibit a self-similar formTransient dynamics control channel geometry on fan ©2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911413826&doi=10.1002%2f2014GL060991&partnerID=40&md5=f9431dcab0d45758bbd5d3f47516598b
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/6935
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA, United States
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| Recommended Citation: | |
Miller K.L.,Reitz M.D.,Jerolmack D.J.. Generalized sorting profile of alluvial fans[J]. Geophysical Research Letters,2014-01-01,41(20).
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