Arid
DOI10.1016/j.scitotenv.2015.11.135
Mapping the groundwater vulnerability for pollution at the pan African scale
Ouedraogo, Issoufou; Defourny, Pierre; Vanclooster, Marnik
通讯作者Ouedraogo, Issoufou
来源期刊SCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
EISSN1879-1026
出版年2016
卷号544页码:939-953
英文摘要

We estimated vulnerability and pollution risk of groundwater at the pan-African scale. We therefore compiled the most recent continental scale information on soil, land use, geology, hydrogeology and climate in a Geographical Information System(GIS) at a resolution of 15 km x 15 km and at the scale of 1:60,000,000. The groundwater vulnerability map was constructed by means of the DRASTIC method. The map reveals that groundwater is highly vulnerable in Central and West Africa, where the watertable is very low. In addition, very low vulnerability is found in the large sedimentary basins of the African deserts where groundwater is situated in very deep aquifers. The groundwater pollution risk map is obtained by overlaying the DRASTIC vulnerability map with land use. The northern, central and western part of the African continent is dominated by high pollution risk classes and this is very strongly related to shallow groundwater systems and the development of agricultural activities. Subsequently, we performed a sensitivity analysis to evaluate the relative importance of each parameter on groundwater vulnerability and pollution risk. The sensitivity analysis indicated that the removal of the impact of vadose zone, the depth of the groundwater, the hydraulic conductivity and the net recharge causes a large variation in the mapped vulnerability and pollution risk. The mapping model was validated using nitrate concentration data of groundwater as a proxy of pollution risk. Pan-African concentration data were inferred from a meta-analysis of literature data. Results shows a good match between nitrate concentration and the groundwater pollution risk classes. The pan African assessment of groundwater vulnerability and pollution risk is expected to be of particular value for water policy and for designing groundwater resources management programs. We expect, however, that this assessment can be strongly improved when better pan African monitoring data related to groundwater pollution will be integrated in the assessment methodology. (C) 2015 Elsevier B.V. All rights reserved.


英文关键词Groundwater vulnerability Nitrate contamination Meta-analysis Pollution risk
类型Article
语种英语
国家Belgium
收录类别SCI-E
WOS记录号WOS:000369491500100
WOS关键词DRASTIC MODEL ; AQUIFER VULNERABILITY ; SENSITIVITY-ANALYSIS ; GIS ; RISK ; METHODOLOGY ; SYSTEM ; REGION ; HAZARD ; BASIN
WOS类目Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/196199
作者单位Catholic Univ Louvain, Earth & Life Inst, Croix Sud 2,Box 2, B-1348 Louvain, Belgium
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Ouedraogo, Issoufou,Defourny, Pierre,Vanclooster, Marnik. Mapping the groundwater vulnerability for pollution at the pan African scale[J],2016,544:939-953.
APA Ouedraogo, Issoufou,Defourny, Pierre,&Vanclooster, Marnik.(2016).Mapping the groundwater vulnerability for pollution at the pan African scale.SCIENCE OF THE TOTAL ENVIRONMENT,544,939-953.
MLA Ouedraogo, Issoufou,et al."Mapping the groundwater vulnerability for pollution at the pan African scale".SCIENCE OF THE TOTAL ENVIRONMENT 544(2016):939-953.
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