[ Variation spatiale et temporelle de la salinité des eaux souterraines dans la région nord et ouest de l'aquifère Sine-Gambie (Sénégal) ]
Volume 24, Issue 4, November 2018, Pages 1679–1689
Seyni NDOYE1, Moumtaz RAZACK2, and Cheikh Bécaye GAYE3
1 Université Cheikh Anta Diop, Ecole Supérieure Polytechnique, Département de Génie Civil, BP 5085 Dakar Fann, Senegal
2 Department of Hydrogeologye UMR 7185, University of Poitiers, France
3 Université Cheikh Anta Diop, Faculté des Sciences et Techniques, Département de Géologie, BP 5005 Dakar Fann, Senegal
Original language: French
Copyright © 2018 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This study intends to see the temporal and spatial evolution of groundwater salinization at the northern and western zone of the CT aquifer in the Sine-Gambie region (Senegal). To do this, a hydrochemical study was conducted in 2015 and compared with previous studies (2000 and 2012). This study is essentially based on the two parameters, electrical conductivity and chloride content. The results obtained show that the evolution of salinity observed in these areas is explained by a contamination of the groundwater by the waters from the Saloum River and the sea. The comparison of groundwater electrical conductivity maps showed a salinity increase between 2000 and 2015; with a salinization phenomenon which increases toward inland in phase with chloride levels that doubled in some wells. The study also shows that several calcium bicarbonate facies have evolved to calcium chloride facies, and calcium chloride facies to chloride sodium facies.
Author Keywords: Evolution, conductivity, chloride, aquifer, Saloum, Salinization.
Volume 24, Issue 4, November 2018, Pages 1679–1689
Seyni NDOYE1, Moumtaz RAZACK2, and Cheikh Bécaye GAYE3
1 Université Cheikh Anta Diop, Ecole Supérieure Polytechnique, Département de Génie Civil, BP 5085 Dakar Fann, Senegal
2 Department of Hydrogeologye UMR 7185, University of Poitiers, France
3 Université Cheikh Anta Diop, Faculté des Sciences et Techniques, Département de Géologie, BP 5005 Dakar Fann, Senegal
Original language: French
Copyright © 2018 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
This study intends to see the temporal and spatial evolution of groundwater salinization at the northern and western zone of the CT aquifer in the Sine-Gambie region (Senegal). To do this, a hydrochemical study was conducted in 2015 and compared with previous studies (2000 and 2012). This study is essentially based on the two parameters, electrical conductivity and chloride content. The results obtained show that the evolution of salinity observed in these areas is explained by a contamination of the groundwater by the waters from the Saloum River and the sea. The comparison of groundwater electrical conductivity maps showed a salinity increase between 2000 and 2015; with a salinization phenomenon which increases toward inland in phase with chloride levels that doubled in some wells. The study also shows that several calcium bicarbonate facies have evolved to calcium chloride facies, and calcium chloride facies to chloride sodium facies.
Author Keywords: Evolution, conductivity, chloride, aquifer, Saloum, Salinization.
Abstract: (french)
Cette étude se propose de voir l’évolution temporelle et spatiale de la salinisation des eaux souterraines au niveau de la zone bordière nord et ouest de la nappe du CT de la région Sine-Gambie (Sénégal). Pour ce faire, une étude hydrochimique a été réalisée en 2015 et comparée avec des études précédentes (2000 et 2012). Cette étude repose pour l’essentiel sur les deux paramètres que sont la conductivité électrique et la teneur en chlorure. Les résultats obtenus montrent que l’évolution de la salinité observée au niveau de ces zones est expliquée par une contamination de la nappe par les eaux du fleuve Saloum et de la mer. La comparaison des cartes de conductivités électriques de l’eau souterraine a montré une augmentation de la salinité entre 2000 et 2015 avec un phénomène de salinisation qui s’accentue vers l’intérieur des terres en phase avec des teneurs en chlorure qui ont doublé dans certains puits. L’étude montre également que plusieurs faciès bicarbonatés calciques ont évolué vers des faciès chlorurés calciques et des faciès chlorurés calciques vers des faciès chlorurés sodiques.
Author Keywords: Evolution, conductivité, chlorure, aquifère, Saloum, Salinisation.
How to Cite this Article
Seyni NDOYE, Moumtaz RAZACK, and Cheikh Bécaye GAYE, “Spatial and Temporal Variation of groundwater Salinity in the Northern and Western Region in the Sine-Gambie aquifer (Senegal),” International Journal of Innovation and Applied Studies, vol. 24, no. 4, pp. 1679–1689, November 2018.
