Arid
DOI10.1007/s10040-012-0925-4
Residence times of shallow groundwater in West Africa: implications for hydrogeology and resilience to future changes in climate
Lapworth, D. J.1; MacDonald, A. M.2; Tijani, M. N.3; Darling, W. G.1; Gooddy, D. C.1; Bonsor, H. C.2; Araguas-Araguas, L. J.4
通讯作者Lapworth, D. J.
来源期刊HYDROGEOLOGY JOURNAL
ISSN1431-2174
EISSN1435-0157
出版年2013
卷号21期号:3页码:673-686
英文摘要

Although shallow groundwater (< 50 mbgl) sustains the vast majority of improved drinking-water supplies in rural Africa, there is little information on how resilient this resource may be to future changes in climate. This study presents results of a groundwater survey using stable isotopes, CFCs, SF6, and H-3 across different climatic zones (annual rainfall 400-2,000 mm/year) in West Africa. The purpose was to quantify the residence times of shallow groundwaters in sedimentary and basement aquifers, and investigate the relationship between groundwater resources and climate. Stable-isotope results indicate that most shallow groundwaters are recharged rapidly following rainfall, showing little evidence of evaporation prior to recharge. Chloride mass-balance results indicate that within the arid areas (< 400 mm annual rainfall) there is recharge of up to 20 mm/year. Age tracers show that most groundwaters have mean residence times (MRTs) of 32-65 years, with comparable MRTs in the different climate zones. Similar MRTs measured in both the sedimentary and basement aquifers suggest similar hydraulic diffusivity and significant groundwater storage within the shallow basement. This suggests there is considerable resilience to short-term inter-annual variation in rainfall and recharge, and rural groundwater resources are likely to sustain diffuse, low volume abstraction.


英文关键词Groundwater recharge Groundwater age Climate variability Environmental tracers Africa
类型Article
语种英语
国家England ; Scotland ; Nigeria ; Austria
收录类别SCI-E
WOS记录号WOS:000317989800012
WOS关键词SAHELIAN WATER-TABLE ; LONG-TERM RISE ; RECHARGE ; NIGER ; SF6 ; SUPPLIES ; BASIN ; CHLOROFLUOROCARBONS ; AQUIFERS ; TRITIUM
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/2XILL650/177507
作者单位1.British Geol Survey, Wallingford OX10 8BB, Oxon, England;
2.British Geol Survey, Edinburgh EH9 3LA, Midlothian, Scotland;
3.Univ Ibadan, Dept Geol, Ibadan, Oyo, Nigeria;
4.IAEA, A-1400 Vienna, Austria
推荐引用方式
GB/T 7714
Lapworth, D. J.,MacDonald, A. M.,Tijani, M. N.,et al. Residence times of shallow groundwater in West Africa: implications for hydrogeology and resilience to future changes in climate[J],2013,21(3):673-686.
APA Lapworth, D. J..,MacDonald, A. M..,Tijani, M. N..,Darling, W. G..,Gooddy, D. C..,...&Araguas-Araguas, L. J..(2013).Residence times of shallow groundwater in West Africa: implications for hydrogeology and resilience to future changes in climate.HYDROGEOLOGY JOURNAL,21(3),673-686.
MLA Lapworth, D. J.,et al."Residence times of shallow groundwater in West Africa: implications for hydrogeology and resilience to future changes in climate".HYDROGEOLOGY JOURNAL 21.3(2013):673-686.
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