Geo-investigation on groundwater control in some parts of Ogun state using data from Shuttle Radar Topography Mission and vertical electrical soundings

Abstract

Groundwater is a vital natural resource that plays a significant function in sustainability of living things on earth. Its exploration requires special skill for optimum exploitation. Shuttle Radar Topography Mission (SRTM)and Vertical Electrical Sounding (VES) were used to detectthe stratigraphy and subsurface structures controlling the groundwater system around Iju -Ota, Ogun State, Southwestern Nigeria. Nineteen (19) VES points were carried out where there were dense concentrations of lineaments and interconnected to establish the connection of the observed lineaments with groundwater occurrence in the study area using Schlumberger array, with electrode spacing of AB/2 varying from 180 to 320 m. The analysis of SRTM data revealedthe dominating structural NE-SW and NW-SE trends, which control aquifer structure. The geoelectrical parameters from the VES results were used to map the stratigraphic sequences in the study area. Six (6) units that comprisethe topsoil, lateritic clay, clayey sand, mudstone, sand (main aquifer), and shale or clay were identified in the study area. The aquiferous unit around Iju -Ota axis ranged from 30 to 80 m. Theextracted from the hill shaded SRTM data and the result of VES revealed that the thickness of the aquifer is as a result of interconnectivity of the lineaments observed in the SRTM data suggesting that the groundwater occurrence in the study area is chiefly controlled by these fractures.

Aeromagnetic mapping of fault architecture along Lagos–Ore axis, southwestern Nigeria

“…The results of this study are in agreement with the works of [93] and [94] who reported that the maximum depth to the aquiferous units within Atan-Ota axis, a brittle deformation zone, varied from 80 to 130 m.…”

Pilot groundwater radon mapping and the assessment of health risk from heavy metals in drinking water of southwest, Nigeria

“…The prevailing sedimentary formation in the study area is the Benin Formation which is considered permeable as it consists of an alternation of sands and clay. Generally, the occurrence, accumulation, and movement of groundwater in the study area are primarily controlled by geology (Joel et al, 2020).…”

Global Optimization Very Fast Simulated Annealing Inversion for the Interpretation of Groundwater Potential

“…Steiner try to applied resistivity methods combined with seismic methods to investigate pollutants in groundwater (Steiner et al, 2022). Besides that, the resistivity method can also be used to identify groundwater potential (Joel et al, 2020), especially in areas that are still hard to get clean water supply or areas that require agricultural irrigation (Alarifi et al, 2022;Chikabvumbwa et al, 2021;Zaher et al, 2021). The difference in resistivity values due to the presence of salt minerals such as sodium chloride in the aquifer can also be used to analyze the phenomenon of seawater intrusion using this method (Ammar et al, 2021;Wilopo et al, 2018).…”