干旱区生态环境知识资源中心(Arid): Aeolian Creep Transport: Theory and Experiment

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DOI	10.1029/2020GL088644
	Aeolian Creep Transport: Theory and Experiment
	Wang, Peng; Zhang, Jie; Dun, Hongchao; Herrmann, Hans J.; Huang, Ning
通讯作者	Huang, N
来源期刊	GEOPHYSICAL RESEARCH LETTERS
ISSN	0094-8276
EISSN	1944-8007
出版年	2020
卷号	47 期号:15
英文摘要	Aeolian sand transport drives geophysical phenomena, such as bedform evolution and desertification. Creep plays a crucial, yet poorly understood, role in this process. We present a model for aeolian creep, making quantitative predictions for creep fluxes, which we verify experimentally. We discover that the creep transport rate scales like the Shields number to the power 5/2, clearly different from the laws known for saltation. We derive this 5/2 power scaling law from our theory and confirm it with meticulous wind tunnel experiments. We calculate the creep flux and layer thickness in steady state exactly and for the first time study the relaxation of the flux toward saturation, obtaining an analytic expression for the relaxation time. Plain Language Summary The sand transport of granular beds under the action of turbulent wind-sheared flows is of major importance for the bedforms evolution and desertification processes. Up to now, the saltation transport is well understood and predictable but not the creep transport and relevant scaling laws. In this study, a theory for the aeolian creep transport is developed and verified through wind tunnel experiments. We propose for the first time a scaling law with the Shields number for the creep transport rate. Our novel model allows predictions of the aeolian creep transport rate and shows that it captures the relaxation process in actual creep transport. Such theoretical model provides key tools for the study of aeolian creep but could not previously be studied in such detail. Our study provides a better understanding for the phenomenon that the bed surface itself appeared to be "fluidized" in aeolian sand transport.
英文关键词	aeolian sand transport creep saltation scaling laws wind tunnel relaxation process
类型	Article
语种	英语
开放获取类型	Other Gold
收录类别	SCI-E
WOS记录号	WOS:000560376100013
WOS关键词	PARTICLE-SIZE ; SAND ; SALTATION ; GRAINS ; MODEL ; BED
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/325663
作者单位	[Wang, Peng; Zhang, Jie; Dun, Hongchao; Huang, Ning] Lanzhou Univ, Coll Civil Engn & Mech, Key Lab Mech Disaster & Environm Western China, Lanzhou, Peoples R China; [Wang, Peng] Lanzhou Univ Technol, Sch Sci, Lanzhou, Peoples R China; [Herrmann, Hans J.] PMMH ESPCI, Paris, France; [Herrmann, Hans J.] Univ Fed Ceara, Dept Fis, Fortaleza, Ceara, Brazil
推荐引用方式 GB/T 7714	Wang, Peng,Zhang, Jie,Dun, Hongchao,et al. Aeolian Creep Transport: Theory and Experiment[J]. 兰州大学,2020,47(15).
APA	Wang, Peng,Zhang, Jie,Dun, Hongchao,Herrmann, Hans J.,&Huang, Ning.(2020).Aeolian Creep Transport: Theory and Experiment.GEOPHYSICAL RESEARCH LETTERS,47(15).
MLA	Wang, Peng,et al."Aeolian Creep Transport: Theory and Experiment".GEOPHYSICAL RESEARCH LETTERS 47.15(2020).