INTEGRATED GEOPHYSICAL METHODS IN MAPPING SANDFILLED CHANNEL AT MTU CAMPUS, SOUTHWESTERN NIGERIA

📄 Project Abstract

Integrated geophysical survey has been used in mapping a sandfilled channel within Mountain Top University. The width of the sandfilled region has been mapped with the aid of historical satellite images but the thickness and depth are unknown. Therefore, Ground Penetrating Radar (GPR), and Electrical Resistivity Tomography (ERT) methods were integrated to delineate the thickness and depth of the sandfilled/river channel, characterise the infill materials and deduce its engineering implications. Nine traverses each about 60 m long were established at inter-traverse spacing of 10 m across the strike of the river channel. 2D ERT data were acquired with ABEM LS and 1m electrode spacing using dipole-dipole array. The resistivity data were inverted using smooth-model inversion with 2D EarthImager. The parallel 2D ERT lines were further combined and inverted with 3D EarthImager to generate an 3D inverted resistivity cube of the subsurface. The GPR data were acquired with Mala ProEx and 160MHz...