Mapping of Geological-Geotechnical Risk of Mass Movement in an Urban Area in Rio Piracicaba, MG, Brazil

The objective of this study is to create a geological-geotechnical risk map of mass movement for an urban perimeter of Rio Piracicaba city, state of Minas Gerais, MG, Brazil, by applying the methodology proposed by the Brazilian Ministry of Cities. Four neighborhoods were evaluated through works conducted in the field and with the aid of a GIS fed with aerial images obtained from an Unmanned Aerial Vehicle (UAV). In these neighborhoods, 29 points were categorized as risk-points, and 14 risk areas were delimited and hierarchized. Despite being considered a subjective evaluation, the methodology used is a simple and efficient qualitative method, which can contribute significantly to the preliminary identification of areas under risk of mass movements, indicating the nature of the predisposing factors. The areas classified as high-risk present significant physical and environmental problems, mainly due to non-compliance with current legislation regarding urban planning and land use. The outcomes of these surveys are valuable tools that will facilitate the planning and management of land use and occupation in the municipality.