Evaluation of irregular occupation of slope

case study

Abstract

The human occupation of slope risk areas alters the natural balance of this geographic accident, thus causing vulnerability due to the susceptibility of landslides, through natural and anthropic factors. In view of this, this work aims to analyze the impacts arising from irregular occupation in a risk area in the neighborhood of Bultrins, in the municipality of Olinda/PE, performing a temporal analysis of this occupation and aiming to identify the variation of soil typologies. The data collection occurred by obtaining orthophoto maps of the years 1974 and 1984 and satellite images of the years 2003, 2013, 2017 and 2020. For the temporal analysis of the study region, the ArcGIS PRO 2.6 software was used, in which the georeferencing was performed and an evaluation of the parameters of occupation of the site, identifying urban spots, vegetation suppression and exposed soil. Based on the results, it was possible to verify that between the years 1974 and 2020 there was a reduction of -58.66% of vegetation cover, as well as an increase of +72.92% of the urban spot area and a decrease of -14.25% of the exposed soil. Therefore, the study highlights the irregular and disorderly occupation of the hillside and provides important information to the public authorities for decision making, which may minimize the risk of the area.