Joint geophysical and hydrogeochemical assessment of groundwater quality degradation in coastal aquifer systems at a suburb of Kosofe, Lagos, southwest Nigeria

Geophysical survey involving 20 vertical electrical soundings (VES) and 4 constant separation traverses (CST) was conducted to assess the aquifer systems at Owode–Onirin in Lagos, southwest Nigeria. Hydrogeochemical analysis was also conducted on water samples from 4 handmade wells and 1 borehole. I...

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Bibliographic Details
Published in:Sustainable water resources management 2023-02, Vol.9 (1), p.19, Article 19
Main Authors: Olatinsu, Olawale Babatunde, Ndukwe-Agu, Ginikachukwu Charity, Ozebo, Vitali Chidi
Format: Article
Language:English
Subjects:
Alkalinity
Aquifer systems
Aquifers
Bicarbonates
Boreholes
Calcium
Coastal aquifers
Coastal plains
Development Economics
Dissolved solids
Earth and Environmental Science
Earth Sciences
Electrical conductivity
Electrical resistivity
Environmental protection
Fresh water
Freshwater
Geoelectricity
Geophysical surveys
Geophysics
Groundwater
Groundwater quality
Hydrogeochemistry
Hydrogeology
Hydrology/Water Resources
Inland water environment
Magnesium
Original Article
Oxygen content
Phosphates
Quality assessment
Saline water
Saline water intrusion
Sodium
Soundings
Suburban areas
Surveying
Sustainable Development
Total dissolved solids
Turbidity
Water analysis
Water hardness
Water Policy/Water Governance/Water Management
Water quality
Water salinity
Water sampling
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Summary:Geophysical survey involving 20 vertical electrical soundings (VES) and 4 constant separation traverses (CST) was conducted to assess the aquifer systems at Owode–Onirin in Lagos, southwest Nigeria. Hydrogeochemical analysis was also conducted on water samples from 4 handmade wells and 1 borehole. Interpreted 1-D and 2-D resistivity data yields a maximum of five geoelectric layers. Coastal plain sand from either the second or third geoelectric layers represents the aquifer unit within the study area. Although low aquifer resistivity (≤ 21 Ωm) depicts significant saline water intrusion, fresh water aquifer was delineated beneath two locations with resistivity range of 115–127 Ωm at depth range of 17.6–19.2 m. The high mean value of total dissolved solids (856 mg/L) and electrical conductivity (1712 µS/cm) corroborates high water salinity. Average concentrations of turbidity (0.122 NTU), chloride (56.00 mg/L), nitrate (18.00 mg/L), and sodium (23.00 mg/L) are below the levels of 
ISSN:2363-5037
2363-5045
DOI:10.1007/s40899-022-00807-w