干旱区生态环境知识资源中心(Arid): The role of local perched aquifers in regional groundwater recharge in semi-arid environments: evidence from the Cuvelai-Etosha Basin, Namibia

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DOI	10.1007/s10040-019-02008-w
	The role of local perched aquifers in regional groundwater recharge in semi-arid environments: evidence from the Cuvelai-Etosha Basin, Namibia
	Hamutoko, J. T.1; Post, V. E. A.2; Wanke, H.1,3; Beyer, M.2; Houben, G.2; Mapani, B.1
通讯作者	Hamutoko, J. T.
来源期刊	HYDROGEOLOGY JOURNAL
ISSN	1431-2174
EISSN	1435-0157
出版年	2019
卷号	27 期号:7 页码:2399-2413
英文摘要	The influence of local perched aquifers on groundwater recharge in semi-arid areas at a regional scale remains inadequately studied, especially in southern Africa where data scarcity limits the understanding of recharge and groundwater flow processes. The objective of this study was to understand the interaction between localized perched aquifers and an underlying regional aquifer in the Cuvelai-Etosha Basin in Namibia. The connection between the perched and regional aquifers was assessed based on an extensive dataset of hydrochemical and isotope (delta O-18 and delta H-2) measurements for groundwater from both shallow and deep hand-dug wells as well as boreholes. Ephemeral rivers and pans/depression landforms were analyzed separately. Recharge was calculated using the chloride mass balance method. It was found that groundwater originates from precipitation that undergoes strong evapotranspiration and water-rock interaction, especially carbonate dissolution. Overlapping chemical and isotopic compositions suggest a common or similar origin of groundwater in the perched and regional aquifers in the pan/depression hydrotope. No such similarity was established for the ephemeral river hydrotope, suggesting that ephemeral rivers contribute negligibly to regional groundwater recharge. This has important implications for groundwater management and helps to understand recharge processes in similar semi-arid environments.
英文关键词	Groundwater recharge Hydrochemistry Stable isotopes Perched aquifers Namibia
类型	Article
语种	英语
国家	Namibia ; Germany ; England
收录类别	SCI-E
WOS记录号	WOS:000502730500006
WOS关键词	HYDROLOGICAL RESPONSE ; RESIDENCE TIMES ; KALAHARI ; ISOTOPE ; CATCHMENT ; AFRICA ; REGIME ; FLOW
WOS类目	Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Geology ; Water Resources
EI主题词	2019-11-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310463
作者单位	1.Univ Namibia, Dept Geol, Windhoek, Namibia; 2.Fed Inst Geosci & Nat Resources BGR, Hannover, Germany; 3.Univ West England, Dept Geog & Environm Management, Bristol BS16 1QY, Avon, England
推荐引用方式 GB/T 7714	Hamutoko, J. T.,Post, V. E. A.,Wanke, H.,et al. The role of local perched aquifers in regional groundwater recharge in semi-arid environments: evidence from the Cuvelai-Etosha Basin, Namibia[J],2019,27(7):2399-2413.
APA	Hamutoko, J. T.,Post, V. E. A.,Wanke, H.,Beyer, M.,Houben, G.,&Mapani, B..(2019).The role of local perched aquifers in regional groundwater recharge in semi-arid environments: evidence from the Cuvelai-Etosha Basin, Namibia.HYDROGEOLOGY JOURNAL,27(7),2399-2413.
MLA	Hamutoko, J. T.,et al."The role of local perched aquifers in regional groundwater recharge in semi-arid environments: evidence from the Cuvelai-Etosha Basin, Namibia".HYDROGEOLOGY JOURNAL 27.7(2019):2399-2413.