Geophysical survey in the Alto Rio Turvo Basin, Sao Paulo. Correlation between geoelectric and hydrodynamic data

Abstract

Vertical electrical soundings (VES) were measured at Rio Turvo Basin, State of Sao Paulo, close to Monte Alto, Pirangi. Geologically, this area is formed of sediments of the Bauru Group (Adamantina and Marilia Formations). This clayey - sand aquifer has hundreds of producing wells. From these, 90 are quite well described (DAEE-IG/USP) and VES were measured at these. In 30 of the wells, aquifer hydrodynamic parameters were determined. Resistivities and thickness of the saturated layers were correlated with hydrodynamic parameters at these points, revealing a correlation between 0.70 and 0.82 using the linear regression method. Significance analysis, using Student t' test, at the 5% level, indicated that the correlations are consistent and that the probability of the correlation of the geoelectrical parameters to the hydrodynamic parameters, is 95%. -English summary