DOI: 10.1002/2014GL062945
论文题名: Discrete Element Method simulations of the saturation of aeolian sand transport
作者: Pähtz T. ; Omeradžic A. ; Carneiro M.V. ; Araújo N.A.M. ; Herrmann H.J.
刊名: Geophysical Research Letters
ISSN: 0094-8854
EISSN: 1944-8585
出版年: 2015
卷: 42, 期: 6 起始页码: 2063
结束页码: 2070
语种: 英语
英文关键词: aeolian sand transport
; drag length
; saltation
; saturation length
Scopus关键词: Coastal engineering
; Drag
; Numerical methods
; Sand
; Velocity control
; Wind
; Accurate modeling
; Aeolian sand
; Characteristic distance
; Discrete element method simulations
; Gravitational constant
; Particle velocities
; saltation
; Wind-blown sands
; Transport properties
; discrete element method
; drag
; eolian deposit
; morphodynamics
; particle motion
; saturation
; sediment transport
; simulation
; wind field
英文摘要: The saturation length of aeolian sand transport (Ls ), characterizing the distance needed by wind-blown sand to adapt to changes in the wind shear, is essential for accurate modeling of the morphodynamics of Earth's sandy landscapes and for explaining the formation and shape of sand dunes. In the last decade, it has become a widely accepted hypothesis that Ls is proportional to the characteristic distance needed by transported particles to reach the wind speed (the "drag length"). Here we challenge this hypothesis. From extensive numerical Discrete Element Method simulations, we find that, for medium and strong winds, Ls Vs2/g, where Vs is the saturated value of the average speed of sand particles traveling above the surface and g is the gravitational constant. We show that this proportionality is consistent with a recent analytical model, in which the drag length is just one of four similarly important length scales relevant for sand transport saturation. Key Points Drag length is not the only length relevant for sand transport saturation Other saturation mechanisms than fluid drag seem to be equally important The saturation length scales with the particle velocity square for strong wind ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84927722817&doi=10.1002%2f2014GL062945&partnerID=40&md5=13d75d21336cde60aa9daf060e75a832
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8470
Appears in Collections: 科学计划与规划 气候变化与战略
There are no files associated with this item.
作者单位: Institute of Physical Oceanography, Ocean College, Zhejiang University, Hangzhou, China
Recommended Citation:
Pähtz T.,Omeradžic A.,Carneiro M.V.,et al. Discrete Element Method simulations of the saturation of aeolian sand transport[J]. Geophysical Research Letters,2015-01-01,42(6).