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1D modeling of aquifer vulnerability and soil corrosivity within the sedimentary terrain in Southern Nigeria, using resistivity method

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Eyankware M. O., Umayah S. O.
World News of Natural Sciences
|
2022
|
vol. 41
33-50
EN
Groundwater vulnerability/soil corrosivity was carried out within the study area, with the sole aim of classifying groundwater and soil corrosivity into various classes with the aid of the resistivity method. For this study the Vertical Electrical Sounding (VES) method was used, Schlumberger electrode configuration was used with maximum electrode spacing (AB/2) of 200 m in sixteen (16) different locations for data acquisition. Geoelectric parameters (layer resistivity and thickness) were determined from the interpreted data. Findings from Geoelectric Layer susceptibility indexing (GLSI) revealed that the northern, southern, and northeast of the study area value range of 70 to 160, 70 to 150, and 120 to 160 are considered to be highly vulnerable, vulnerable, and highly vulnerable respectively. The estimated result obtained from longitudinal unit conductance (S) showed that groundwater is considered to be slightly prone to contamination from the surface. Deduction from corrosivity revealed that VESs location showed no trace of corrosivity except for VES 15. According to findings from VES 15, underground metallic installations should be buried at a depth away from the aforementioned VES point.
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Aquifer evaluation in southern parts of Nigeria from geo-electrical derived parameters

100%
Umayah S. O., Eyankware M. O.
World News of Natural Sciences
|
2022
|
vol. 42
28-43
EN
For the management of groundwater resources, understanding aquifer parameters is critical. The Vertical electrical sounding (VES) is considered one of the most common methods in groundwater exploration/aquifer vulnerability assessment. For the study, 15 VES survey was conducted using the Schlumberger configuration with a maximum electrode spacing of 200 m. The data were acquired using ABEM SAS 4000 Terrameter and processed using the WINRESIST program. The data collected were analyzed and interpreted in both qualitative and quantitative terms. Results obtained from the study area revealed that geoelectric layers range from 3 to 4, while the major kind of curve type that domain the study area is the H curve. The evaluation of aquifer protective capacity/groundwater potentials was based on the following parameters: Reflection Coefficient (Rc), Resistivity Contrast (Fc), Longitudinal Conductance (S), and Average Transverse Resistance (T). Result obtained from the study revealed that Rc, Fc, S, and T ranges from -0.70 to 0.95 with an average value of 0.10, 0.17 to 35.79 with an average value of 0.57, 822.26 to 32009.8 with an average value of 13908.8, and 0.001 Ω/m2 to 0.25 Ω/m2 with an average value of 0.063 Ω/m2 respectively. Deductions from Rc and Fc suggest that the study area showed good prospects for groundwater potential. Findings from S suggest that the study is vulnerable to surface contamination due to anthropogenic activities.
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