干旱区生态环境知识资源中心(Arid): Experimental investigation of mass flux and transport rate of different size particles in mixed sand transport by wind

Arid

DOI	10.1016/j.geomorph.2020.107320
	Experimental investigation of mass flux and transport rate of different size particles in mixed sand transport by wind
	Kang, Liqiang; Zou, Xueyong
通讯作者	Kang, LQ
来源期刊	GEOMORPHOLOGY
ISSN	0169-555X
EISSN	1872-695X
出版年	2020
卷号	367
英文摘要	Sand transport by wind in arid regions is a geomorphic process affected by the grain size distribution. Knowledge of the transport behavior of each size group in mixed sand transport is important for understanding the saltation dynamics in dune migration. This paper focuses on the characteristics of mass flux, mass concentration, horizontal velocity and transport rate of different particle size groups and the relation to their mass proportion in air. Experiments were carried out to analyze these relations in a wind tunnel by particle tracking velocimetry. The mass flux of different size particles usually decays exponentially with height for larger size groups and deviates from exponential decay for smaller size groups. The trend of mass concentration of different size groups with height is similar to the mass flux. The mean horizontal velocity of different size groups generally increases with increasing height and decreases with the increase of particle size at the same height. With increasing height, the ratio of mass flux of each size group to the total mass flux increases for the smaller size group but decreases for the larger size group, and the transition diameter of particles is about 0.14 mm for the 0.16 mm sand sample and about 0.21-0.27 mm for the 0.24 mm sand sample. For the smaller size group, the ratio of the mass-weighted average horizontal velocity of each size group to that of all particle sizes is N1.0, and the ratio of the transport rate of each size group to the total transport rate is usually larger than its mass proportion in air; this is the opposite for the larger size groups. The maximum deviation of mass flux proportion of each size group from its mass proportion in air is about +/- 15%, which is determined by the mass-weighted average horizontal velocity of each size group. (C) 2020 Elsevier B.V. All rights reserved.
英文关键词	Mixed sand transport Sand flux Transport rate PTV (particle tracking velocimetry)
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000564546600004
WOS关键词	GRAIN-SIZE ; VERTICAL-DISTRIBUTION ; AEOLIAN TRANSPORT
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
来源机构	北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/325921
作者单位	[Kang, Liqiang] Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China; Beijing Normal Univ, Fac Geog Sci, Engn Ctr Desertificat & Blown Sand Control, Minist Educ, Beijing 100875, Peoples R China
推荐引用方式 GB/T 7714	Kang, Liqiang,Zou, Xueyong. Experimental investigation of mass flux and transport rate of different size particles in mixed sand transport by wind[J]. 北京师范大学,2020,367.
APA	Kang, Liqiang,&Zou, Xueyong.(2020).Experimental investigation of mass flux and transport rate of different size particles in mixed sand transport by wind.GEOMORPHOLOGY,367.
MLA	Kang, Liqiang,et al."Experimental investigation of mass flux and transport rate of different size particles in mixed sand transport by wind".GEOMORPHOLOGY 367(2020).