INVESTIGATING SOIL PEOPERTIES IN OWANOBA COMMUNITY, EDO STATE, NIGERIA USING 2-D ELECTRICAL RESISTIVITY TOMOGRAPHY (ERT)

ABSTRACT

This study focuses on the characterization of subsurface soil and determination of soil strength using 2D Electrical Resistivity Tomography (ERT) in Owanoba community, Edo State, Nigeria. The purpose is to map subsurface soil resistivity variations with depth, analyze the correlation between resistivity variations and lateral distance, and interpret resistivity variations in terms of soil properties such as lithology, moisture, and porosity. The research utilizes surface electrical resistivity measurements translated into electrical properties of subsurface soil. By integrating ERT and geotechnical data, the study aims to understand the relationship between soil strength and electrical resistivity, considering parameters like grain size distribution, degree of saturation, porosity, and cementation. The 2D ERT profile reveals variations in subsurface electrical resistivity attributed to distinct geoelectric layers. Analysis of the correlation between resistivity variations and lateral distance suggests changes in soil properties across the traverse. Interpretation of resistivity variations indicates the presence of loose sand in the uppermost layer and limited groundwater storage capacity throughout the profile, making the area less suitable for groundwater development.