Groundwater exploration using Electrical Resistivity Imaging (ERI) at Kemahang, Tanah Merah, Kelantan

Abstract

The electrical resistivity imaging (ERI) method was conducted at Kemahang, Tanah Merah, Kelantan. This study intends to explore the potential for groundwater resources in the study area. The greatest way for locating groundwater is ERI, a technique that doesn't alter the composition or functionality of the soil. ERI survey is concerned with the resistivity (ωm) value of subsurface rocks. The Pole-Dipole array was used for this study, and a total of two survey lines were used. Each survey line was 200 m long, with 2.5 m between electrodes. ABEM Terrameter LS Toolbox is used to record all the data, and RES2DINV software is used to process it. All the data are processed in two-dimensional (2D) resistivity profiles will give a better understanding of the geological environment and enable the detection of groundwater. The findings indicate fluctuating resistivity with a range of 1-4000 ωm and an inquiry depth of roughly 45 m. High resistivity zones of 4000 ωm indicate values for granitic rock, whereas low resistivity zones of 10-800 ωm reveal values for the area's fractured aquifer, which is viewed as a potential water carrying zone (bedrock). Bedrock is found to be around 50 m below the indicated fractured aquifer layer, which is located at a depth of about 25 m. By measuring the depth of the fractured zone for probable zones with low resistivity values, this study provides an idea of the potential groundwater resources.