Tomografia de resistividade elétrica e sísmica de refração na avaliação de encostas: o caso da Encosta do Mirante, Guarujá-São Paulo

Electrical resistivity tomography and seismic refraction in slope assessment: the case of Mirante Slope, Guarujá-São Paulo

Abstract

The occurrence of landslides in mountainous regions due to rainfall has motivated intense discussions about the search for mechanisms to monitor hydrological processes at a detailed scale. Geophysics emerges as an alternative methodology in overcoming this challenge, given its practicality in obtaining data, resolution capacity, cost/benefit ratio, besides using non-invasive methods. Thus, the aim of the research is to explore the potential of the combined use of the Refraction Seismic method with Electrical Resistivity Tomography in the evaluation of slopes associated with landslides, especially from different climatic contexts. For this purpose, a characterization of the regolith was carried out using both methods in two different climatological scenarios, dry and rainy periods. In this opportunity, the aspects related to the correlations between the tomography information to understand the water-regolith dynamics will also be presented. Considering the benefits from the combination of both methods, it is believed that the increase of geophysical information in geotechnical monitoring can contribute decisively to the understanding of slope instability mechanisms.