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	Field observations of the vertical distribution of sand transport characteristics over fine, medium and coarse sand surfaces
	Zhang, ZhengCai; Dong, ZhiBao; Qian, GuangQiang
刊名	EARTH SURFACE PROCESSES AND LANDFORMS
	2017-05-01
卷号	42期号:6页码:889-902
关键词	sand transport grain size distribution Gaussian peak function inflection point
ISSN号	0197-9337
DOI	10.1002/esp.4045
通讯作者	Zhang, ZhengCai(zhangzhsi@sina.com)
英文摘要	The vertical distribution of sand transport characteristics is an important issue in aeolian research. Surface characteristics affect sand transport processes, but their effects are not yet fully understood. To provide more data on this subject, we observed sand transport in 16 field experiments above surfaces covered by fine, medium and coarse sand. The sand transport rate over relatively coarser-grained medium and coarse surfaces could be expressed as a Gaussian peak function: q(z)=a+b exp (-0.5[(|z - C-h|)/d](e)), where q(z) is the measured sediment transport at height z above the bed and a, b, C-h, d, and e are regression coefficients. The measured sand transport flux peak values (H-h) were linearly related to C-h, and both values were significantly related to the mean surface grain size. However, for the relatively finer-grained medium and fine sand surfaces, the sediment transport could be expressed as an exponential function. The cumulative sand transport below 0.1m was directly related to the mean surface grain size, and the relationship could be expressed as the following exponential function: C-z=f+g exp -M-z/i, where C-z is the cumulative sand transport at height z above the bed, M-z is the mean grain size and f, g, and i are regression coefficients. Above 0.1m, there were no significant relationships between the cumulative sand transport and the mean surface grain size. The mean grain size decreased with increasing height below the peak height and then increased with increasing height. The surface grain size distribution and proportions of the particles in different grain size categories controlled the mean grain size as a function of height. The observed changes in the sand transport rate and grain size with height will provide support for sand disaster mitigation, numerical modelling and studies of dune formation. Copyright (c) 2016 John Wiley & Sons, Ltd.
收录类别	SCI
WOS关键词	MASS FLUX DISTRIBUTIONS ; WIND-ERODED SEDIMENT ; GRAIN-SIZE ; SALTATING PARTICLES ; AEOLIAN TRANSPORT ; HEIGHT PROFILE ; GRAVEL SURFACE ; DUST STORMS ; CLOUD ; BEACH
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
语种	英语
出版者	WILEY
WOS记录号	WOS:000400646100004
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2557710
专题	寒区旱区环境与工程研究所
通讯作者	Zhang, ZhengCai
作者单位	Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Key Lab Desert & Desertificat, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Zhang, ZhengCai,Dong, ZhiBao,Qian, GuangQiang. Field observations of the vertical distribution of sand transport characteristics over fine, medium and coarse sand surfaces[J]. EARTH SURFACE PROCESSES AND LANDFORMS,2017,42(6):889-902.
APA	Zhang, ZhengCai,Dong, ZhiBao,&Qian, GuangQiang.(2017).Field observations of the vertical distribution of sand transport characteristics over fine, medium and coarse sand surfaces.EARTH SURFACE PROCESSES AND LANDFORMS,42(6),889-902.
MLA	Zhang, ZhengCai,et al."Field observations of the vertical distribution of sand transport characteristics over fine, medium and coarse sand surfaces".EARTH SURFACE PROCESSES AND LANDFORMS 42.6(2017):889-902.

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