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DOI	10.1088/1748-9326/abd661
	Mapping groundwater recharge in Africa from ground observations and implications for water security
	MacDonald, Alan M.; Lark, R. Murray; Taylor, Richard G.; Abiye, Tamiru; Fallas, Helen C.; Favreau, Guillaume; Goni, Ibrahim B.; Kebede, Seifu; Scanlon, Bridget; Sorensen, James P. R.; Tijani, Moshood; Upton, Kirsty A.; West, Charles
通讯作者	MacDonald, AM (corresponding author), British Geol Survey, Lyell Ctr, Edinburgh EH14 4AP, Midlothian, Scotland.
来源期刊	ENVIRONMENTAL RESEARCH LETTERS
ISSN	1748-9326
出版年	2021
卷号	16 期号:3
英文摘要	Groundwater forms the basis of water supplies across much of Africa and its development is rising as demand for secure water increases. Recharge rates are a key component for assessing groundwater development potential, but have not been mapped across Africa, other than from global models. Here we quantify long-term average (LTA) distributed groundwater recharge rates across Africa for the period 1970-2019 from 134 ground-based estimates and upscaled statistically. Natural diffuse and local focussed recharge, where this mechanism is widespread, are included but discrete leakage from large rivers, lakes or from irrigation are excluded. We find that measurable LTA recharge is found in most environments with average decadal recharge depths in arid and semi-arid areas of 60 mm (30-140 mm) and 200 mm (90-430 mm) respectively. A linear mixed model shows that at the scale of the African continent only LTA rainfall is related to LTA recharge-the inclusion of other climate and terrestrial factors do not improve the model. Kriging methods indicate spatial dependency to 900 km suggesting that factors other than LTA rainfall are important at local scales. We estimate that average decadal recharge in Africa is 15 000 km(3) (4900-45 000 km(3)), approximately 2% of estimated groundwater storage across the continent, but is characterised by stark variability between high-storage/low-recharge sedimentary aquifers in North Africa, and low-storage/high-recharge weathered crystalline-rock aquifers across much of tropical Africa. African water security is greatly enhanced by this distribution, as many countries with low recharge possess substantial groundwater storage, whereas countries with low storage experience high, regular recharge. The dataset provides a first, ground-based approximation of the renewability of groundwater storage in Africa and can be used to refine and validate global and continental hydrological models while also providing a baseline against future change.
英文关键词	water security Africa climate change groundwater water supply
类型	Article
语种	英语
开放获取类型	gold, Green Published, Green Accepted
收录类别	SCI-E
WOS记录号	WOS:000618339100001
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
来源机构	French National Research Institute for Sustainable Development ; University of London
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/347871
作者单位	[MacDonald, Alan M.; Fallas, Helen C.; Upton, Kirsty A.] British Geol Survey, Lyell Ctr, Edinburgh EH14 4AP, Midlothian, Scotland; [Lark, R. Murray] Univ Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD, Leics, England; [Taylor, Richard G.] UCL, Dept Geog, London WC1E 6BT, England; [Abiye, Tamiru] Univ Witwatersrand, Sch Geosci, Johannesburg, South Africa; [Favreau, Guillaume] Univ Grenoble Alpes, Inst Rech Dev, CNRS, Grenoble INP,IGE, Grenoble, France; [Goni, Ibrahim B.] Univ Maiduguri, Dept Geol, Borno, Nigeria; [Kebede, Seifu] Univ KwaZulu Natal, Ctr Water Resources Res, Sch Agr Earth & Environm Sci, Durban, South Africa; [Scanlon, Bridget] Univ Texas Austin, Jackson Sch Geosci, Bur Econ Geol, Austin, TX 78712 USA; [Sorensen, James P. R.] British Geol Survey, Maclean Bldg, Wallingford, Oxon, England; [Tijani, Moshood] Univ Ibadan, Dept Geol, Ibadan, Nigeria; [West, Charles] Univ Bristol, Dept Civil Engn, Bristol, Avon, England; [West, Charles] Univ Bristol, Cabot Inst, Bristol, Avon, England;...
推荐引用方式 GB/T 7714	MacDonald, Alan M.,Lark, R. Murray,Taylor, Richard G.,et al. Mapping groundwater recharge in Africa from ground observations and implications for water security[J]. French National Research Institute for Sustainable Development, University of London,2021,16(3).
APA	MacDonald, Alan M..,Lark, R. Murray.,Taylor, Richard G..,Abiye, Tamiru.,Fallas, Helen C..,...&West, Charles.(2021).Mapping groundwater recharge in Africa from ground observations and implications for water security.ENVIRONMENTAL RESEARCH LETTERS,16(3).
MLA	MacDonald, Alan M.,et al."Mapping groundwater recharge in Africa from ground observations and implications for water security".ENVIRONMENTAL RESEARCH LETTERS 16.3(2021).