[ Cartographie des zones de potentielles recharges de nappes d’eau souterraines dans le département des Collines ]
Volume 36, Issue 3, June 2022, Pages 877–891
Okoundé K. J. Eudes1, F. Avahounlin Ringo2, C. Kélomé Nelly3, Sambiénou Gédéon4, and Expédit W. VISSIN5
1 Chaire Internationale de Physique Mathématique et Applications (CIPMA CHAIRE-UNESCO, FAST, UAC), Benin
2 Chaire Internationale de Physique Mathématique et Applications (CIPMA CHAIRE-UNESCO, FAST, UAC), Benin
3 Département des Sciences de la Terre (DST, FAST, UAC), Benin
4 Chaire Internationale de Physique Mathématique et Applications (CIPMA CHAIRE-UNESCO, FAST, UAC), Benin
5 Laboratoire Pierre Pagney: Climat, Eau, Ecosystèmes et Développement (LACEEDE/UAC), Abomey-Calavi, 03 BP 1122 Cotonou, Benin
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.
Benin's renewable water resource potential is no less important. In the basement regions such as the Collines department, the hydrogeological characteristics made of crystalline rocks condition the recharge of the aquifers and therefore the durability of the boreholes drilled. The objective of this study is to determine the potential groundwater recharge zones at the scale of collines aquifer systems. Thus from planimetric data made of geological, pedological, hydrographic, slope, land use maps; satellite images and technical data from 50 boreholes, piezometric level mapping methods associated with multi-criteria analysis methods were applied. It appears from the results obtained that the aquifer system of the Hills located in a hydrogeologically difficult zone is made of a strong potential of recharge. The piezometric levels vary between around 40 m and 320 m. The highest are located in the north (recharge zone) of the department and gradually decrease towards the south to minimum values of 40 m. The general trend of the flow is from North to South with domes and depressions. The main domes are in the north in the municipalities of Bantè and Ouessè. Depressions are observed south of the communes of Savalou and Dassa-Zoumè. The domes constitute the groundwater recharge zones while the depressions are the discharge zones. Recharge areas require protective measures to avoid pollution in the aquifer system.
Author Keywords: Collines, groundwater tables, piezometric levels, charging areas.
Volume 36, Issue 3, June 2022, Pages 877–891
Okoundé K. J. Eudes1, F. Avahounlin Ringo2, C. Kélomé Nelly3, Sambiénou Gédéon4, and Expédit W. VISSIN5
1 Chaire Internationale de Physique Mathématique et Applications (CIPMA CHAIRE-UNESCO, FAST, UAC), Benin
2 Chaire Internationale de Physique Mathématique et Applications (CIPMA CHAIRE-UNESCO, FAST, UAC), Benin
3 Département des Sciences de la Terre (DST, FAST, UAC), Benin
4 Chaire Internationale de Physique Mathématique et Applications (CIPMA CHAIRE-UNESCO, FAST, UAC), Benin
5 Laboratoire Pierre Pagney: Climat, Eau, Ecosystèmes et Développement (LACEEDE/UAC), Abomey-Calavi, 03 BP 1122 Cotonou, Benin
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
Benin's renewable water resource potential is no less important. In the basement regions such as the Collines department, the hydrogeological characteristics made of crystalline rocks condition the recharge of the aquifers and therefore the durability of the boreholes drilled. The objective of this study is to determine the potential groundwater recharge zones at the scale of collines aquifer systems. Thus from planimetric data made of geological, pedological, hydrographic, slope, land use maps; satellite images and technical data from 50 boreholes, piezometric level mapping methods associated with multi-criteria analysis methods were applied. It appears from the results obtained that the aquifer system of the Hills located in a hydrogeologically difficult zone is made of a strong potential of recharge. The piezometric levels vary between around 40 m and 320 m. The highest are located in the north (recharge zone) of the department and gradually decrease towards the south to minimum values of 40 m. The general trend of the flow is from North to South with domes and depressions. The main domes are in the north in the municipalities of Bantè and Ouessè. Depressions are observed south of the communes of Savalou and Dassa-Zoumè. The domes constitute the groundwater recharge zones while the depressions are the discharge zones. Recharge areas require protective measures to avoid pollution in the aquifer system.
Author Keywords: Collines, groundwater tables, piezometric levels, charging areas.
Abstract: (french)
Le potentiel en ressources en eau renouvelable du bénin est non moins important. Dans les régions de socle comme le département des collines, les caractéristiques hydrogéologiques faites de roches cristallines conditionnent la recharge des nappes donc la pérennité des forages réalisés. La présente étude a pour objectif de déterminer les potentiels zones de recharges des nappes d’eau souterraine à l’échelle des systèmes aquifères des collines. Ainsi à partir des données planimétriques faites de cartes géologiques, pédologiques, hydrographiques, de pentes, l’occupation du sol; les images satellitales et les données techniques de 50 forages, des méthodes de cartographies des niveaux piézométriques associées aux méthodes d’analyse multicritère ont été appliquées. Il ressort des résultats obtenus que le système aquifère des Collines situé dans une zone hydrogéologiquement difficile est faite d’un fort potentiel de recharge. Les niveaux piézométriques varient entre 40 m et 320 m environs. Les plus élevés se situent au Nord (zone de recharge) du département et diminuent graduellement vers le Sud jusqu'aux valeurs minimales de 40 m. La tendance générale de l’écoulement est du Nord vers le Sud avec des dômes et des dépressions. Les principaux dômes se trouvent au Nord dans les communes de Bantè et de Ouessè. Les dépressions sont observées au Sud des communes de Savalou et de Dassa-Zoumè. Les dômes constituent les zones de recharges de la nappe tandis que les dépressions sont les zones de décharges. Les zone de recharge nécessitent des mesures de protection afin d’éviter toute pollution dans le système aquifère.
Author Keywords: Collines, nappes d’eau souterraine, niveaux piézométriques, zones de recharge.
How to Cite this Article
Okoundé K. J. Eudes, F. Avahounlin Ringo, C. Kélomé Nelly, Sambiénou Gédéon, and Expédit W. VISSIN, “Mapping of potential groundwater recharge areas in Collines department,” International Journal of Innovation and Applied Studies, vol. 36, no. 3, pp. 877–891, June 2022.
