Geoelectrohydraulic investigation of the surficial aquifer units and corrosivity in parts of Uyo L. G. A., Akwa Ibom State, Southern Nigeria

Abstract

This study was carried out employing vertical electrical sounding (VES) with Schlumberger electrode configuration. The objectives were to investigate the distribution of the geohydraulic parameters and the corrosivity of the aquifer layer within the study area. The sand-tocoarse grain sands aquifer have resistivity ranging from 8.1 to 2204 Xm, while the thickness ranged from 7.4 to 55.3 m. These parameters were used in computing the geohydraulic parameters. Hydraulic conductivity was estimated using the Heigold equation, and its values ranged from 1.42 to 54.90 m/day. Estimated hydraulic conductivity values were employed in determining the aquifer transmissivity which ranged from 11.28 to 812.00 m 2 /day, fractional porosities ranged from 0.0351 to 0.0598. The longitudinarl conductance also varies from 0.01 to 1.83 X -1 . The contour plots generated from the SURFER software package show the variation of these parameters. The ranges of these estimated parameters indicate variation in grain sizes, magnitude of pore sizes and facies changes. The corrosivity rating indicates that most of the VES points were practically non-corrosive.

Vulnerability assessment of hydrogeologic units in parts of Enugu North, Southeastern Nigeria, using integrated electrical resistivity methods

“…(56) . ( Figures 7 and 8) shows the variation of resistivities with depths in the geoelectric section along transect AB https://www.indjst.org/ and CD ( Figure 2) which cuts across VES 18,17,16,15,14,and 36 and VES 38,42,7,8,9,13 respectively. The earth materials that dominates the subsurface are fine-medium grain sand, coarse grain sand, dark grey shale, fine grain sand, medium-coarse grain sand, the fine grain sand and the coarse grain sand harbors most of the aquifer layers.…”

“…The contamination of the aquifer depends on factors like the depth to the aquifer, concentration of contaminants, and permeability of subsurface layers, geological setting and the direction of groundwater flow (11)(12)(13) . In determining the quality of groundwater, the geochemical or biogeochemical mineral composition of aquifer rocks and groundwater flow are considered.…”

Geophysical assessment of aquifer vulnerability and management: a case study of University of Nigeria, Nsukka, Enugu State

“…The quality of groundwater can be affected by the percolation of surface pollutants from dumpsites, sewage and run-off/flood. Once entered into the groundwater table, they affect the potability of groundwater (Hossain et al 2014;Ibuot et al 2017). The percolation of these pollutants is enhanced due to highly permeable covering layers of subsurface and ease fluid flow through the subsurface since the flow is through a combination of intergranular pores, fissures and interconnected fractures.…”

Estimating geohydrodynamic parameters and their implications on aquifer repositories: a case study of university of Nigeria, Nsukka, Enugu State

“…Since hydraulic conductivity is controlled by the intergranular porosity and fracturing, the low values of K in the southern parts may be attributed to poor communication channels in the pore spaces and the variation in grain size. According to literatures, the movement of groundwater contaminants is controlled by hydraulic conductivity (Chandra 2008;Obianwu et al 2011;Ibanga & George 2016;Ibuot et al 2017;Obiora et al 2018).…”