干旱区生态环境知识资源中心(Arid): Groundwater recharge processes in the Lake Chad Basin based on isotopic and chemical data

Arid

DOI	10.1007/s10040-023-02699-2
	Groundwater recharge processes in the Lake Chad Basin based on isotopic and chemical data
	Vassolo, Sara; Groeschke, Maike; Koeniger, Paul; Neukum, Christoph; Seehausen, Laila; Witt, Lilli; Ronnelngar, Melanie; Daira, Djoret
通讯作者	Vassolo, S
来源期刊	HYDROGEOLOGY JOURNAL
ISSN	1431-2174
EISSN	1435-0157
出版年	2024
卷号	32 期号:1 页码:149-165
英文摘要	The Lake Chad Basin is Africa's largest endorheic basin. Because water supply for the rural population and most of the urban population depends on groundwater, assessment of groundwater recharge is crucial. Recharge sources for the upper Quaternary aquifer are precipitation, rivers, and swamps. Using water chemistry, and environmental (O-18, H-2, H-3) and carbon (C-14) isotopes, recharge processes can be assessed and groundwater ages roughly estimated. For this purpose, more than 1,000 samples from groundwater, surface water and precipitation were analysed for hydrochemistry and environmental stable isotopes. Furthermore, 3H measurements and C-14 values of dissolved inorganic carbon for groundwater from the northeastern part of the Basin are included in the evaluation. The environmental isotope distribution shows recent recharge from precipitation north of Lake Chad (Kanem Region), where very low 3H values indicate occurrence before the 1960s bomb peak. Focused recharge from fresh river water is typical for Salamat Region in south Chad and the Komadugu Yobe wetlands between Nigeria and Niger. Slightly high d-values in water occur in the Waza Logone area between Chad and Cameroon. Groundwater along the Lake Chad shore and the Bahr el Ghazal corridor show high d-values (d(18)O -0.78 to 7.45%o, d(2)H -13.6 to 30.8%o). Recharge is caused by surface water that undergoes evaporative processes before percolation. Groundwater ages of 600-4,150 years, estimated from C-14 analyses combined with high SO4 concentrations, along the Bahr el Ghazal indicate that recharge was caused by residuals of the Mega Lake before it dried out completely.
英文关键词	Isotope hydrology Groundwater renewal Africa Transboundary aquifer Arid regions
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:001061435100001
WOS关键词	STABLE-ISOTOPES ; WATER-MOVEMENT ; RIVER-BASIN ; PROFILES ; CHLORIDE ; AREAS ; UNCERTAINTY ; CAMEROON ; STRESS ; NIGER
WOS类目	Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404088
推荐引用方式 GB/T 7714	Vassolo, Sara,Groeschke, Maike,Koeniger, Paul,et al. Groundwater recharge processes in the Lake Chad Basin based on isotopic and chemical data[J],2024,32(1):149-165.
APA	Vassolo, Sara.,Groeschke, Maike.,Koeniger, Paul.,Neukum, Christoph.,Seehausen, Laila.,...&Daira, Djoret.(2024).Groundwater recharge processes in the Lake Chad Basin based on isotopic and chemical data.HYDROGEOLOGY JOURNAL,32(1),149-165.
MLA	Vassolo, Sara,et al."Groundwater recharge processes in the Lake Chad Basin based on isotopic and chemical data".HYDROGEOLOGY JOURNAL 32.1(2024):149-165.