Uso da geofísica na detecção e caracterização de um aquífero fraturado – Caçapava do Sul/RS

Abstract

The exploration of underground water has recently gained importance due to the high demand of an ever growing industry and population over the past few years and the unavailability for consume of the said resource from rivers, lakes and aquifers as a result of human activity. Difficulties to supply the local population with water and losses of agricultural production are common. The geophysics applied to the exploration of underground water constitutes an acknowledged method of indirect investigation widely used for detection, analysis and characterization of potentially favorable areas for superficial and underground water prospection. This study has the objective to perform a preliminary diagnosis of the characteristics of a fractured aquifer in the municipality of Caçapava do Sul, RS through the geophysical method of DC resistivity, using constant separation traversing (CST). The results were presented in 3 sections of electric path and allowed the detection of the rocky top (granite) covered by thick layer of soil in the area. Fracture, alteration zones (saprolyte) of the rock are presented in interpreted sections (geoelectric models) from the observed resistive/conductive contrasts. The study represents an important tool in noninvasive indirect investigation in a site covered by soil layer. It also offers an important geotechnical characterization of the site as subsidies for future studies.