Baseline evaluation of freshwater–saltwater interface in coastal aquifers of Badagry, south-western Nigeria
Abstract This study focused on the evaluation of the baseline condition of saline water–groundwater interface in the coastal aquifers along Badagry, south-western Nigeria. Geologically, Badagry lies within the coastal sands and recent alluvium of the Dahomey Basin. Two-dimensional electrical resisti...
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doaj-cfe37a19923440989c220d4956c4ae752020-11-25T02:04:34ZengSpringerOpenApplied Water Science2190-54872190-54952019-05-019411410.1007/s13201-019-0957-1Baseline evaluation of freshwater–saltwater interface in coastal aquifers of Badagry, south-western NigeriaMoroof O. Oloruntola0Adetayo F. Folorunso1Olateju O. Bayewu2Ganiyu O. Mosuro3Sadiq Adewale4Department of Geosciences, University of LagosDepartment of Marine Science and Technology, Federal University of TechnologyDepartment of Earth Sciences, Olabisi Onabanjo UniversityDepartment of Earth Sciences, Olabisi Onabanjo UniversityDepartment of Geosciences, University of LagosAbstract This study focused on the evaluation of the baseline condition of saline water–groundwater interface in the coastal aquifers along Badagry, south-western Nigeria. Geologically, Badagry lies within the coastal sands and recent alluvium of the Dahomey Basin. Two-dimensional electrical resistivity tomography (2D-ERT) data along 15 survey lines were acquired in the study area, adopting the Wenner electrode arrays system with minimum spacing of 10 m. Ninety-one water samples were also collected, and their physical parameters were measured using hand-held devices. The (2D-ERT) data were processed and interpreted with the aid of DiProWin software. Sandy topmost layer, freshwater sand, brackish water sand and saline water sand were delineated from the study. Brackish water sand and freshwater sand layers were dominant in areas with high proximity to the Atlantic Ocean located in the south, which were not observed in the northern part of the mapped area. The study established the freshwater–saltwater interface at a depth of 10 m and above, in areas around the coast, while the interface occurs at depth greater than 50 m in areas 3–5 km from the coastal area. Observations from the pH and the TDS show that 87.3% of the samples are slightly acid, while less than 12.7% of them are slightly alkaline, while the TDS vary from 8 to 520 mg/l. The EC of the samples varies from 13 to 1140 µS/cm. All water samples are fresh groundwater, which confirms the occurrence of freshwater aquifer even in areas closer to the Atlantic Ocean.http://link.springer.com/article/10.1007/s13201-019-0957-1BaselineFreshwaterSaltwaterInterfaceCoastalAquifers |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Moroof O. Oloruntola Adetayo F. Folorunso Olateju O. Bayewu Ganiyu O. Mosuro Sadiq Adewale |
spellingShingle |
Moroof O. Oloruntola Adetayo F. Folorunso Olateju O. Bayewu Ganiyu O. Mosuro Sadiq Adewale Baseline evaluation of freshwater–saltwater interface in coastal aquifers of Badagry, south-western Nigeria Applied Water Science Baseline Freshwater Saltwater Interface Coastal Aquifers |
author_facet |
Moroof O. Oloruntola Adetayo F. Folorunso Olateju O. Bayewu Ganiyu O. Mosuro Sadiq Adewale |
author_sort |
Moroof O. Oloruntola |
title |
Baseline evaluation of freshwater–saltwater interface in coastal aquifers of Badagry, south-western Nigeria |
title_short |
Baseline evaluation of freshwater–saltwater interface in coastal aquifers of Badagry, south-western Nigeria |
title_full |
Baseline evaluation of freshwater–saltwater interface in coastal aquifers of Badagry, south-western Nigeria |
title_fullStr |
Baseline evaluation of freshwater–saltwater interface in coastal aquifers of Badagry, south-western Nigeria |
title_full_unstemmed |
Baseline evaluation of freshwater–saltwater interface in coastal aquifers of Badagry, south-western Nigeria |
title_sort |
baseline evaluation of freshwater–saltwater interface in coastal aquifers of badagry, south-western nigeria |
publisher |
SpringerOpen |
series |
Applied Water Science |
issn |
2190-5487 2190-5495 |
publishDate |
2019-05-01 |
description |
Abstract This study focused on the evaluation of the baseline condition of saline water–groundwater interface in the coastal aquifers along Badagry, south-western Nigeria. Geologically, Badagry lies within the coastal sands and recent alluvium of the Dahomey Basin. Two-dimensional electrical resistivity tomography (2D-ERT) data along 15 survey lines were acquired in the study area, adopting the Wenner electrode arrays system with minimum spacing of 10 m. Ninety-one water samples were also collected, and their physical parameters were measured using hand-held devices. The (2D-ERT) data were processed and interpreted with the aid of DiProWin software. Sandy topmost layer, freshwater sand, brackish water sand and saline water sand were delineated from the study. Brackish water sand and freshwater sand layers were dominant in areas with high proximity to the Atlantic Ocean located in the south, which were not observed in the northern part of the mapped area. The study established the freshwater–saltwater interface at a depth of 10 m and above, in areas around the coast, while the interface occurs at depth greater than 50 m in areas 3–5 km from the coastal area. Observations from the pH and the TDS show that 87.3% of the samples are slightly acid, while less than 12.7% of them are slightly alkaline, while the TDS vary from 8 to 520 mg/l. The EC of the samples varies from 13 to 1140 µS/cm. All water samples are fresh groundwater, which confirms the occurrence of freshwater aquifer even in areas closer to the Atlantic Ocean. |
topic |
Baseline Freshwater Saltwater Interface Coastal Aquifers |
url |
http://link.springer.com/article/10.1007/s13201-019-0957-1 |
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