Abstract
The purpose of this study is to discuss the ideas and procedures underlying the Azimuthal square array electrical resistivity approach for the aquifer investigation in the Thattaparai region of Thoothukudi, Tamil Nadu. The physical properties of rocks and hydrochemical variations of groundwater were used to study rock-water interaction. The study region was covered with black and red soil, gravel, kankar, and hard rock composed of weathered gneiss and charnockite. Nine profiles were surveyed for electrical resistivity (DC) using an azimuthal square array. The surveys were conducted with the aid of the CRM-500 Aquameter, electrodes, and wire spools with accessories. The water-bearing zone occurs at depths of 10m, 30m, and 50m, with an apparent resistivity range of 100–120 Ohm.m in the hard rock region, as determined by the electrical resistivity research. This is an effective method for agricultural aquifer exploration. The hydrochemical approach is used to determine the interaction between rock and water, and the geochemical concentration of ions in groundwater has been determined using different factors. The chemical composition of groundwater reflects the interaction between rock and water and chemical processes. Therefore, groundwater geochemistry assists in determining the rock–water interaction and chemical processes of the various water types present
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