干旱区生态环境知识资源中心(Arid): The Effects of Wind Regime and Sand Supply on the Coexistence of Barchans and Linear Dunes in China's Qaidam Basin

Arid

DOI	10.3389/feart.2022.897640
	The Effects of Wind Regime and Sand Supply on the Coexistence of Barchans and Linear Dunes in China's Qaidam Basin
	Ma, Fang; Lu, Ping; Cao, Min
通讯作者	Lü, P
来源期刊	FRONTIERS IN EARTH SCIENCE
EISSN	2296-6463
出版年	2022
卷号	10
英文摘要	Dunes composed of granular materials are present in deserts and other environments, such as subaqueous environments and environments on other planets, with very different time and length scales for their evolution. In arid regions, barchans (transverse dunes) develop under a unimodal wind regime, and are oriented perpendicular to the sand transport direction, whereas linear (longitudinal) dunes develop under a bimodal wind regime and are oriented parallel to the sand transport direction. However, field survey results cannot be explained solely by the wind because barchans and linear dunes can coexist under the same wind regime. Here, we investigated China's Qaidam Basin, where barchans and linear dunes coexist. We measured dune morphology, analyzed wind data, and quantified the sand supply (equivalent sand thickness) to describe their development environment, and focused on the effect of sand supply to explore the combined effects of wind regime and sand supply on the coexistence of barchans and linear dunes. In our study area, barchans and linear dunes had low heights. The wind regime was narrowly bimodal, with low directional variability. The sand supply was limited (low equivalent sand thickness), but was greater for barchan chains than for barchans, and linear dunes had the smallest supply; the equivalent sand thickness in the linear dune areas was half that in barchan areas and one-quarter that in barchan chain areas. Except in the presence of topographical barriers and cohesive sediments, a unimodal or bimodal wind regime with an acute angle allows barchans and linear dunes to coexist under a low sand supply. The linear dunes and the barchans migrated along the resultant drift direction. Though we studied aeolian dunes, these findings will increase our understanding of these similar bedforms that develop in other planetary environments (e.g., Mars).
英文关键词	equivalent sand thickness sand supply qaidam basin linear dunes barchan dunes coexisting wind regime
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000881930100001
WOS关键词	STIMULATED LUMINESCENCE AGES ; INTERNAL STRUCTURES ; LATERAL MIGRATION ; DESERT ; SEDIMENTS ; NAMIB ; MORPHODYNAMICS ; TRANSVERSE ; BEDFORMS ; ORIGIN
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/392677
推荐引用方式 GB/T 7714	Ma, Fang,Lu, Ping,Cao, Min. The Effects of Wind Regime and Sand Supply on the Coexistence of Barchans and Linear Dunes in China's Qaidam Basin[J],2022,10.
APA	Ma, Fang,Lu, Ping,&Cao, Min.(2022).The Effects of Wind Regime and Sand Supply on the Coexistence of Barchans and Linear Dunes in China's Qaidam Basin.FRONTIERS IN EARTH SCIENCE,10.
MLA	Ma, Fang,et al."The Effects of Wind Regime and Sand Supply on the Coexistence of Barchans and Linear Dunes in China's Qaidam Basin".FRONTIERS IN EARTH SCIENCE 10(2022).