Abstract
The Raigón aquifer system (SAR) is a hydrogeological system in a sedimentary environment, which is located in the department of San José, Uruguay. Its role is fundamental in supplying water for urban, industrial and agricultural uses and it is the most exploited aquifer in the country. The main objective of this study is to characterize the contact between the Libertad Fm. and Raigón Fm. using two geophysical methods. Therefore, we have carried out a series of profiles of electrical resistivity tomography (ERT) and seismic measurements (refraction) in four geographical areas of the SAR where precise lithological columns are available with different thicknesses of the Libertad Fm. The comparison between the geological information and the geophysical models obtained has allowed both methods to be calibrated. In the last stage of this study, a fifth site was selected in order to determine the characteristics of the land to place new monitoring piezometers. Both geophysical calibrated techniques have proven to be consistent and complementary in the study of the SAR. It was possible to associate ranges of resistivity and the velocity of seismic waves to each of the lithologies of the Libertad Fm with different thicknesses, establishing their contact with the Raigón Fm.
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