干旱区生态环境知识资源中心(Arid): Sediment transport characteristics above a gobi surface in northwestern China, and implications for aeolian environments

Arid

DOI	10.1016/j.aeolia.2021.100745
	Sediment transport characteristics above a gobi surface in northwestern China, and implications for aeolian environments
	Zhang, Zhengcai; Han, Lanying; Pan, Kaijia
通讯作者	Zhang, ZC (corresponding author), Northwest Inst Ecoenvironm & Resources, Chinese Acad Sci, Key Lab Desert & Desertificat, 320 West Donggang Rd, Lanzhou 730000, Gansu, Peoples R China.
来源期刊	AEOLIAN RESEARCH
ISSN	1875-9637
EISSN	2212-1684
出版年	2021
卷号	53
英文摘要	Gobis (gravel deserts) cover large areas in northwestern China and other parts of the world, but sediment transport above gobi surfaces has not been widely investigated; thus, there is insufficient empirical data to support dust source identification. In the present study, we used the LDDSEG vertically segmented sediment sampler to collect sediment transport data above a gobi surface. The results demonstrated that the sediment transport rate above the gobi surface was larger than that above a sandy surface, with rates as high as 9.7 kg m1h-1. The transport flux can be expressed as a Gaussian peak function, with the maximum sediment transport at 0.05 to 0.09 m above the surface. Principal-components analysis (PCA) indicated that the mean grain size of the transported sediment was controlled mainly by the content of silt and clay (<63 mu m) and fine sand (125 to 250 mu m); this explains the inflection height for sediment transport. PCA also indicated that dry lacustrine deposits were the main sediment source in the study region. About 90% of the cumulative sediment transport occurs at a height below 0.65 m. Our results indicate that sediment transported over a gobi surface has higher trajectories and longer distances than above a sandy surface. The larger silt and clay component (about 30%) of the sediment transported over the gobi surface means that gobi surfaces are important dust sources in northern China, although the dust likely originated from dry lacustrine sites upwind of the study site.
英文关键词	Gobi desert Sediment transport rate Gaussian peak function Grain size
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000702573100002
WOS关键词	MASS FLUX DISTRIBUTIONS ; DUST EMISSIONS ; VERTICAL-DISTRIBUTION ; SAND TRANSPORT ; WIND EROSION ; MINERAL DUST ; GRAVEL ; BED ; PROFILE ; GRAINS
WOS类目	Geography, Physical
WOS研究方向	Physical Geography
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/362341
作者单位	[Zhang, Zhengcai; Pan, Kaijia] Northwest Inst Ecoenvironm & Resources, Chinese Acad Sci, Key Lab Desert & Desertificat, 320 West Donggang Rd, Lanzhou 730000, Gansu, Peoples R China; [Han, Lanying] Northwest Reg Climate Ctr, Chinese Meteorol Adm, Lanzhou 730020, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Zhengcai,Han, Lanying,Pan, Kaijia. Sediment transport characteristics above a gobi surface in northwestern China, and implications for aeolian environments[J],2021,53.
APA	Zhang, Zhengcai,Han, Lanying,&Pan, Kaijia.(2021).Sediment transport characteristics above a gobi surface in northwestern China, and implications for aeolian environments.AEOLIAN RESEARCH,53.
MLA	Zhang, Zhengcai,et al."Sediment transport characteristics above a gobi surface in northwestern China, and implications for aeolian environments".AEOLIAN RESEARCH 53(2021).