Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/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
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ISSN | 1431-2174 |
EISSN | 1435-0157 |
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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