Mapeamento e caracterização da suscetibilidade a deslizamentos no setor norte do município de Blumenau (SC): procedimentos metodológicos

Mapping and characterization of landslide susceptibility in the northern sector of the municipality of Blumenau (SC): methodological procedures

Abstract

Landslide stability models, by relying on mathematical formulations that often do not accurately represent the complex dynamics of gravitational mass movements, do not always yield satisfactory results—especially when applied to large areas. To ensure their proper use, validation processes of these models are necessary. This article proposes a methodology for determining landslide susceptibility classes in the northern sector of the municipality of Blumenau, SC. The methodology consists of applying deterministic mathematical models (SHALSTAB and Factor of Safety) based on two types of geotechnical units (pedogeological and geomorpho-pedogeological), resulting in four simulations. The most efficient simulation is identified through validation curves, using a landslide scar map of the study area. These curves not only support the selection of the most effective model but also assist in defining high, medium, and low susceptibility classes—a key step in creating a final susceptibility map with only three classes. In the study area, the simulation using the Factor of Safety applied to geomorpho-pedogeological units showed the best validation results, allowing its reclassification into three susceptibility classes.