Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 0048-9697 |
EISSN | 1879-1026 |
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 |
推荐引用方式 GB/T 7714 | 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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