DOI: 10.1002/2016GL068416
论文题名: Controls on and effects of armoring and vertical sorting in aeolian dune fields: A numerical simulation study
作者: Gao X. ; Narteau C. ; Rozier O.
刊名: Geophysical Research Letters
ISSN: 0094-9259
EISSN: 1944-8990
出版年: 2016
卷: 43, 期: 6 起始页码: 2614
结束页码: 2622
语种: 英语
英文关键词: aeolian dunes
; armoring
; cellular automaton
; sand flux
; size segregation
; vertical sorting
Scopus关键词: Arid regions
; Armor
; Cellular automata
; Metals
; Mixtures
; Sediment transport
; Aeolian dunes
; Armoring
; Cellular automaton models
; Grain size distribution
; Numerical simulation studies
; Sand flux
; Segregation mechanism
; Size segregation
; Grain size and shape
; cellular automaton
; dune field
; eolian deposit
; grain size
; morphodynamics
; numerical model
; sediment transport
; size distribution
; sorting
英文摘要: Unlike ripples, there are only few numerical studies on grain size segregation at the scale of dunes in aeolian environments. Here we use a cellular automaton model to analyze vertical sorting in granular mixtures under steady unidirectional flow conditions. We investigate the feedbacks between dune growth and the segregation mechanisms by varying the size of coarse grains and their proportion within the bed. We systematically observe the development of a horizontal layer of coarse grains at the top of which sorted bed forms may grow by amalgamation. The formation of such an armor layer controls the overall sediment transport and availability. The emergence of dunes and the transition from barchan to transverse dune fields depend only on the grain size distribution of the initial sediment layer. As confirmed by observation, this result indicates that armor layers should be present in most arid deserts, where they are likely to control dune morphodynamics. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84978009457&doi=10.1002%2f2016GL068416&partnerID=40&md5=f1e924bfda25980ac79a2c8a76c16731
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10222
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, Paris, France
Recommended Citation:
Gao X.,Narteau C.,Rozier O.. Controls on and effects of armoring and vertical sorting in aeolian dune fields: A numerical simulation study[J]. Geophysical Research Letters,2016-01-01,43(6).