[ Caractérisation hydrogéochimique de l’aquifère de Samba Dia (Centre-Ouest du Sénégal) ]
Volume 38, Issue 1, November 2022, Pages 71–85
Amadou Sarr1, Seyni NDOYE2, and Serigne Faye3
1 Université Cheikh Anta Diop, Faculté des Sciences et Techniques, Département de Géologie, BP 5005 Dakar Fann, Senegal
2 Université Cheikh Anta Diop, Ecole Supérieure Polytechnique, Département de Génie Civil, BP 5085 Dakar Fann, Senegal
3 Université Cheikh Anta Diop, Faculté des Sciences et Techniques, Département de Géologie, BP 5005 Dakar Fann, Senegal
Original language: French
Copyright © 2022 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.
In the Samba Dia area, located in central western Senegal, the Quaternary aquifer is the only one exploited for the population’s drinking water needs. The main objective of this study is to update and analyze the hydrochemical data of this aquifer. Physicochemical analyses were carried out on 36 water samples to characterize the groundwater in the aquifer and explain the phenomena behind the mineralization of this water. Interpretation of the hydrochemical data was done using the Piper diagram, multivariate analysis (Factor analysis and Hierarchal cluster analysis (HAC)), base exchange index and Na vs Cl, HCO3 vs Ca and (Na-Cl)] vs [(Ca+Mg) - (HC03+S04)] relationships. Water-rock interaction (rock dissolution, base exchange processes) is the dominant mechanism for ion acquisition in the groundwater of this aquifer. The other mechanism is related to water inputs by surface infiltration and intrusion of marine and brackish water. The results of the hydrochemical study show that the chemical species that control water salinization are ions Cl, Na, SO4, Mg, Ca and HCO3.The hydrochemical facies observed for the groundwater samples are Na-Cl (70%), CaCl2 (12.22%) and mixed.
Author Keywords: Hydrogeochemistry, Mineralization processes, Senegal, Samba Dia Aquifer.
Volume 38, Issue 1, November 2022, Pages 71–85
Amadou Sarr1, Seyni NDOYE2, and Serigne Faye3
1 Université Cheikh Anta Diop, Faculté des Sciences et Techniques, Département de Géologie, BP 5005 Dakar Fann, Senegal
2 Université Cheikh Anta Diop, Ecole Supérieure Polytechnique, Département de Génie Civil, BP 5085 Dakar Fann, Senegal
3 Université Cheikh Anta Diop, Faculté des Sciences et Techniques, Département de Géologie, BP 5005 Dakar Fann, Senegal
Original language: French
Copyright © 2022 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
In the Samba Dia area, located in central western Senegal, the Quaternary aquifer is the only one exploited for the population’s drinking water needs. The main objective of this study is to update and analyze the hydrochemical data of this aquifer. Physicochemical analyses were carried out on 36 water samples to characterize the groundwater in the aquifer and explain the phenomena behind the mineralization of this water. Interpretation of the hydrochemical data was done using the Piper diagram, multivariate analysis (Factor analysis and Hierarchal cluster analysis (HAC)), base exchange index and Na vs Cl, HCO3 vs Ca and (Na-Cl)] vs [(Ca+Mg) - (HC03+S04)] relationships. Water-rock interaction (rock dissolution, base exchange processes) is the dominant mechanism for ion acquisition in the groundwater of this aquifer. The other mechanism is related to water inputs by surface infiltration and intrusion of marine and brackish water. The results of the hydrochemical study show that the chemical species that control water salinization are ions Cl, Na, SO4, Mg, Ca and HCO3.The hydrochemical facies observed for the groundwater samples are Na-Cl (70%), CaCl2 (12.22%) and mixed.
Author Keywords: Hydrogeochemistry, Mineralization processes, Senegal, Samba Dia Aquifer.
Abstract: (french)
Dans la zone de Samba Dia, située au centre Ouest du Sénégal, la nappe du Quaternaire est la seule exploitée pour les besoins en eau potable des populations. L’objectif principal de cette étude est de réactualiser et d’analyser les données hydrochimiques de cet aquifère. Des analyses physicochimiques ont été effectuées sur 36 échantillons d’eau pour faire la caractérisation des eaux souterraines de l’aquifère et expliquer les phénomènes à l’origine de la minéralisation de ces eaux. L’interprétation des données hydrochimiques a été faite à l’aide du diagramme de Piper, de l’analyse multivariée (Analyse factorielle et classification hiérarchique ascendante (CHA)), de l’indice des échanges de bases et des relations Na vs Cl, HCO3 vs Ca et (Na-Cl)] vs [(Ca+Mg) - (HCO3+SO4)). L’interaction eau-roche (dissolution de la roche, processus d’échange de base) est le mécanisme dominant dans l’acquisition des ions dans les eaux souterraines de cet aquifère. L’autre mécanisme est lié aux apports d’eaux par infiltration superficielle et intrusion d’eaux marines et saumâtres. Les résultats de l’étude hydrochimique montrent que les espèces chimiques qui contrôlent la salinisation des eaux sont les ions Cl, Na, SO4, Mg, Ca et HCO3. Les faciès hydrochimiques observés pour les échantillons d’eau souterraine sont Na-Cl (70%), CaCl2 (12,22%) et mixtes.
Author Keywords: Hydrogéochimie, Processus de Minéralisation, Sénégal, Aquifère de Samba Dia.
How to Cite this Article
Amadou Sarr, Seyni NDOYE, and Serigne Faye, “Hydrogeochemical characterization of the Samba Dia aquifer (Central West Senegal),” International Journal of Innovation and Applied Studies, vol. 38, no. 1, pp. 71–85, November 2022.
