Application Of Electromagnetic Method And Electrical Resistivity Sounding In Hydrogeological Studies, A Case Study Of Vandeikya Area, Central Nigeria

摘要

Abstract: VLF-EM profiles and Schlumberger depth soundings were carried out in Vandeikya area of Central Benue Trough of Nigeria. The area is underlain by both sedimentary and Basement complex rocks.Groundwater potential and aquifer characteristics of the area were analized using Dar Zarrouk parameters. The geoelectric data acquired were interpreted using partial curve matching, IX1D, Surfer, Grapher and Win-Resist software programmes. The qualitative interpretation of VLF-EM results identifies areas of hydro-geologic importance and forms basis for Schlumberger depth soundings. The study shows that most aquifers in the area lie between the second and the third layer with resistivity varying from 29.5-232.7Ωm. The thicknesses of aquifers in the area vary between 7.3-38.0m. Overburden thicknesses in the area vary between 0.9-6.7m. The study shows that aquifers in the area are prolific with the exception of VES 8 and VES 10 with poor hydrogeologic significance. Dar Zarrouk parameter of longitudinal conductance revealed that transmissivity within the area ranges from 0.49-13.99m2/day.However hydraulic conductivity in the area ranges from 0.0671-1.7124. Correlation coefficient between the modeled transmissivity and hydraulic conductivity gave R2 value of 0.8249 which signifies a perfect correlation.