干旱区生态环境知识资源中心(Arid): Quantifying dune migration patterns and influencing factors in the central Sahara Desert

Arid

DOI	10.1016/j.catena.2023.107686
	Quantifying dune migration patterns and influencing factors in the central Sahara Desert
	Xia, Zishu; Lue, Ping; Ma, Fang; Cao, Min; Yu, Junlin
通讯作者	Lue, P
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2024
卷号	235
英文摘要	Based on Landsat images and ERA5 climate data, here we analyzed geomorphic dune patterns and the spatial characteristics of dune migration in the central Sahara Desert region (SW Libya, SE Algeria), using the COSI-Corr technique. Our results revealed clear observable drift potential (DP) and resultant drift potential (RDP) gradients, these decreasing from a northerly to southerly direction. Moreover, the annual average RDP/DP in most areas was <0.3 (i.e., highly variable). The main dune types in the study area included complex transverse ridges (22.82 %), linear dunes (19.87 %), barchan and barchanoid chains (16.95 %), and star dunes (13.55 %). Of these, barchans and barchanoid chains, as well as complex transverse ridges, appeared in areas of relatively high DP, while complex longitudinal ridges and honeycomb dunes were found in those of low DP. Linear dunes had a simpler wind composition, being mainly distributed in areas with intermediate wind variability. Both the honeycomb dunes and complex longitudinal ridges had nearly always formed in complex multi-directional wind environments. Dune migration displacement in dune fields ranged widely, from 0.5 to 23.57 m (mean = 6.71 m), during the 30-year study period (1993-2022). Barchans and barchanoid chains migrated fastest, with a mean value > 10 m/yr; in contrast, complex longitudinal ridges and honeycomb dunes had the slowest migration rate, always at < 5 m/yr. Overall, the dune migration rate was mainly related to dune height and wind regime. Spatially, the dune migration trend was basically consistent with that of the resultant drift direction (RDD), mainly in a northwesterly direction (28.36 %). The accuracy testing results indicated that the COSI-Corr displacement measurement accuracy was generally higher than the dune migration direction accuracy. This study provides not only valuable reference data for regional aeolian activities, but also insight into the developmental environments and migration dynamics of differing dune types, which could be used for prospective regional aeolian geomorphology research in the Sahara Desert.
英文关键词	Aeolian geomorphology COSI-Corr Random forest Dune migration Spatiotemporal dynamics
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001118859100001
WOS关键词	SAND DUNE ; SPATIAL-ANALYSIS ; NAMIB ; DESERTIFICATION ; DYNAMICS ; IMAGERY ; AGE
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/403126
推荐引用方式 GB/T 7714	Xia, Zishu,Lue, Ping,Ma, Fang,et al. Quantifying dune migration patterns and influencing factors in the central Sahara Desert[J],2024,235.
APA	Xia, Zishu,Lue, Ping,Ma, Fang,Cao, Min,&Yu, Junlin.(2024).Quantifying dune migration patterns and influencing factors in the central Sahara Desert.CATENA,235.
MLA	Xia, Zishu,et al."Quantifying dune migration patterns and influencing factors in the central Sahara Desert".CATENA 235(2024).