Challenges of groundwater pollution and management in transboundary basins at the African scale

<p>We address the significant knowledge gap for groundwater pollution in Africa methods by assessing groundwater pollution risk at the African scale. To do so, we compiled the most recent continental-scale information on soil, land use, geology, hydrogeology, and topography in a Geographical I...

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Autores principales:	I. Ouedraogo, M. Vanclooster
Formato:	article
Lenguaje:	EN
Publicado:	Copernicus Publications 2021
Materias:	Environmental sciences GE1-350 Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/da6cbec423b048898971ba10c5d09e03
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spelling	oai:doaj.org-article:da6cbec423b048898971ba10c5d09e032021-11-16T06:54:20ZChallenges of groundwater pollution and management in transboundary basins at the African scale10.5194/piahs-384-69-20212199-89812199-899Xhttps://doaj.org/article/da6cbec423b048898971ba10c5d09e032021-11-01T00:00:00Zhttps://piahs.copernicus.org/articles/384/69/2021/piahs-384-69-2021.pdfhttps://doaj.org/toc/2199-8981https://doaj.org/toc/2199-899X<p>We address the significant knowledge gap for groundwater pollution in Africa methods by assessing groundwater pollution risk at the African scale. To do so, we compiled the most recent continental-scale information on soil, land use, geology, hydrogeology, and topography in a Geographical Information System at the resolution of 15 <span class="inline-formula">×</span> 15 km and the <span class="inline-formula">1:60 000 000</span> scale. We produced a vulnerability map by using the generic DRASTIC vulnerability indicator. This map revealed that groundwater is highly vulnerable in Central and West Africa groundwater basins, where the water table is shallow. In addition, very low vulnerability classes are found in the large sedimentary basins of Africa deserts where groundwater is situated in very deep aquifers. The generic groundwater pollution risk map is obtained by overlaying the DRASTIC vulnerability indicator with current land use. The northern, central, and western parts of the African continent are dominated by high vulnerability classes and very strongly related to water table depths and the development of agricultural activities. Given the availability of data, we concentrate first on nitrate vulnerability mapping. To this end, groundwater nitrate contamination data are compiled in literature using meta-analysis technic and used to calibrate as well linear and nonlinear statistical models; the latter performing much better as compared to simple linear statistical models. This study will help to raise awareness of the manager's International Basin Authorities or Transboundary Basin Organizations in Africa and in particular on transboundary groundwater pollution issues.</p>I. OuedraogoI. OuedraogoM. VancloosterCopernicus PublicationsarticleEnvironmental sciencesGE1-350GeologyQE1-996.5ENProceedings of the International Association of Hydrological Sciences, Vol 384, Pp 69-74 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Environmental sciences GE1-350 Geology QE1-996.5
spellingShingle	Environmental sciences GE1-350 Geology QE1-996.5 I. Ouedraogo I. Ouedraogo M. Vanclooster Challenges of groundwater pollution and management in transboundary basins at the African scale
description	<p>We address the significant knowledge gap for groundwater pollution in Africa methods by assessing groundwater pollution risk at the African scale. To do so, we compiled the most recent continental-scale information on soil, land use, geology, hydrogeology, and topography in a Geographical Information System at the resolution of 15 <span class="inline-formula">×</span> 15 km and the <span class="inline-formula">1:60 000 000</span> scale. We produced a vulnerability map by using the generic DRASTIC vulnerability indicator. This map revealed that groundwater is highly vulnerable in Central and West Africa groundwater basins, where the water table is shallow. In addition, very low vulnerability classes are found in the large sedimentary basins of Africa deserts where groundwater is situated in very deep aquifers. The generic groundwater pollution risk map is obtained by overlaying the DRASTIC vulnerability indicator with current land use. The northern, central, and western parts of the African continent are dominated by high vulnerability classes and very strongly related to water table depths and the development of agricultural activities. Given the availability of data, we concentrate first on nitrate vulnerability mapping. To this end, groundwater nitrate contamination data are compiled in literature using meta-analysis technic and used to calibrate as well linear and nonlinear statistical models; the latter performing much better as compared to simple linear statistical models. This study will help to raise awareness of the manager's International Basin Authorities or Transboundary Basin Organizations in Africa and in particular on transboundary groundwater pollution issues.</p>
format	article
author	I. Ouedraogo I. Ouedraogo M. Vanclooster
author_facet	I. Ouedraogo I. Ouedraogo M. Vanclooster
author_sort	I. Ouedraogo
title	Challenges of groundwater pollution and management in transboundary basins at the African scale
title_short	Challenges of groundwater pollution and management in transboundary basins at the African scale
title_full	Challenges of groundwater pollution and management in transboundary basins at the African scale
title_fullStr	Challenges of groundwater pollution and management in transboundary basins at the African scale
title_full_unstemmed	Challenges of groundwater pollution and management in transboundary basins at the African scale
title_sort	challenges of groundwater pollution and management in transboundary basins at the african scale
publisher	Copernicus Publications
publishDate	2021
url	https://doaj.org/article/da6cbec423b048898971ba10c5d09e03
work_keys_str_mv	AT iouedraogo challengesofgroundwaterpollutionandmanagementintransboundarybasinsattheafricanscale AT iouedraogo challengesofgroundwaterpollutionandmanagementintransboundarybasinsattheafricanscale AT mvanclooster challengesofgroundwaterpollutionandmanagementintransboundarybasinsattheafricanscale
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Challenges of groundwater pollution and management in transboundary basins at the African scale

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