气候变化领域集成服务门户(CCPortal): Macroscopic Flow Disequilibrium Over Aeolian Dune Fields

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DOI	10.1029/2020GL088773
	Macroscopic Flow Disequilibrium Over Aeolian Dune Fields
	Gunn A.; Schmutz P.; Wanker M.; Edmonds D.A.; Ewing R.C.; Jerolmack D.J.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:18
英文摘要	Aeolian dune fields are self-organized patterns formed by wind-blown sand. Dunes are topographic roughness elements that impose drag on the atmospheric boundary layer (ABL), creating a natural coupling between form and flow. While the steady-state influence of drag on the ABL is well studied, nonequilibrium effects due to roughness transitions are less understood. Here we examine the large-scale coupling between the ABL and an entire dune field. Field observations at White Sands, New Mexico, reveal a concomitant decline in wind speed and sand flux downwind of the transition from smooth playa to rough dunes at the upwind dune-field margin, that affects the entire ∼10-km -long dune field. Using a theory for the system that accounts for the observations, we generalize to other roughness scenarios. We find that, via transitional ABL dynamics, aeolian sediment aggradation can be influenced by roughness both inside and outside dune fields. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Drag; Wind; Aeolian sediments; Field observations; Macroscopic flow; Natural coupling; Non-equilibrium effects; Self-organized patterns; Topographic roughness; Wind-blown sands; Atmospheric boundary layer; aggradation; boundary layer; disequilibrium; drag; dune field; eolian deposit; flow measurement; flux measurement; roughness; sand; steady-state equilibrium; topography; wind velocity; New Mexico; United States; White Sands
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169729
作者单位	Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA, United States; Department of Earth and Environmental Science, University of West Florida, Pensacola, FL, United States; Department of Earth and Atmospheric Sciences, Indiana University, Bloomington, IN, United States; Department of Geology and Geophysics, Texas A&M University, College Station, TX, United States; Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, Philadelphia, PA, United States
推荐引用方式 GB/T 7714	Gunn A.,Schmutz P.,Wanker M.,et al. Macroscopic Flow Disequilibrium Over Aeolian Dune Fields[J],2020,47(18).
APA	Gunn A.,Schmutz P.,Wanker M.,Edmonds D.A.,Ewing R.C.,&Jerolmack D.J..(2020).Macroscopic Flow Disequilibrium Over Aeolian Dune Fields.Geophysical Research Letters,47(18).
MLA	Gunn A.,et al."Macroscopic Flow Disequilibrium Over Aeolian Dune Fields".Geophysical Research Letters 47.18(2020).