干旱区生态环境知识资源中心(Arid): Fluvial system dynamics of Sudano-Sahelian zone during the Late Holocene. The Yame River (Dogon Country, Mali)

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DOI	10.1016/j.geomorph.2019.04.018
	Fluvial system dynamics of Sudano-Sahelian zone during the Late Holocene. The Yame River (Dogon Country, Mali)
	Gamier, Aline; Lespez, Laurent
通讯作者	Gamier, Aline
来源期刊	GEOMORPHOLOGY
ISSN	0169-555X
EISSN	1872-695X
出版年	2019
卷号	340 页码:32-52
英文摘要	In West Africa, most palaeoenvironmental studies have focused on the role of climatic change on the environment Because of the richness of its deposits, the Value River (Mali), a tributary of the Niger River, offers an opportunity to reconstruct the evolution of this fluvial system in comparison with both climatic and anthropogenic changes during the Late Holocene. To investigate more closely the spatio-temporal response of the fluvial system, sedimentary analyses were conducted on seven reaches distributed along the 137 km length of the Yarne valley. This approach testifies of the possibility for each time slice and river reach (1) to reconstruct the fluvial style and processes and (2) to estimate the sediment storage volume reflecting sediment distribution patterns. Results reveal a wide variability of the sedimentary cascade suggesting contrasting responses to external and local controls. Humid (4200-2900 cal. BP; 450-24 cal. BP) or arid (2350-1700 cal. BP) phases have been recorded in fluvial archives while an intensification in erosion and sediment supplies, even during the arid period (2900-2350 cal. BP and the 20th century), may be associated with an increase in human pressure. Two other periods are related to both climate and anthropogenic factors. During 1700-1400 cal. BP phase huge sediment supplies can be explained mainly by the reactivation of both hydrological processes and human occupation after an intense and long arid event. Dispersed sediment sinks recorded during the 450-24 cal. BP period originate from the combination of intensification of colluvial processes and a wet phase context originating from global climatic change. Thus, this study provides evidence that climate is the strongest driver for the fluvial response of these semi-arid and tropical rivers while human disturbance appear as a secondary factor due to the high sensitivity of the environment to climate variability in such areas. (C) 2019 Published by Elsevier B.V.
英文关键词	Fluvial system Climate change Human impact West Africa
类型	Article
语种	英语
国家	France
开放获取类型	Green Published, Bronze
收录类别	SCI-E ; SSCI
WOS记录号	WOS:000476964400003
WOS关键词	LATE QUATERNARY CLIMATE ; WEST-AFRICA ; SEDIMENT DELIVERY ; OUNJOUGOU MALI ; BURKINA-FASO ; HISTORY ; VALLEY ; VARIABILITY ; VEGETATION ; CATCHMENT
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216015
作者单位	Univ Paris Est Creteil, LGP UMR CNRS 8591, Dept Geog, 61 Ave Gen Gaulle, F-94010 Creteil, France
推荐引用方式 GB/T 7714	Gamier, Aline,Lespez, Laurent. Fluvial system dynamics of Sudano-Sahelian zone during the Late Holocene. The Yame River (Dogon Country, Mali)[J],2019,340:32-52.
APA	Gamier, Aline,&Lespez, Laurent.(2019).Fluvial system dynamics of Sudano-Sahelian zone during the Late Holocene. The Yame River (Dogon Country, Mali).GEOMORPHOLOGY,340,32-52.
MLA	Gamier, Aline,et al."Fluvial system dynamics of Sudano-Sahelian zone during the Late Holocene. The Yame River (Dogon Country, Mali)".GEOMORPHOLOGY 340(2019):32-52.