Modelagem da Suscetibilidade a Deslizamentos em Taludes Infinitos e sua Relação com Processos Erosivos Laminares, por Meio de Técnicas de Geoprocessamento, na Bacia de Contribuição Direta da UHE Batalha

Landslide Susceptibility Modelling on Infinite Slopes and Relation to Laminar Erosion Processes, Using Geoprocessing Techniques, in the Direct Contribution Basin of Batalha Hydroelectric Power Plant

Abstract

In areas of irregular relief, slope stability analysis techniques can be applied to estimate safety conditions. The main variables in slope stability analysis include the morphological, pedological and soil physical parameters. In this context, this study applies geoprocessing techniques at a scale of 1:25,000 to analyse the relationship between the stability of infinite slopes and the occurrence of laminar erosion processes in the Direct Contribution Basin (DCB) of the Batalha HPP reservoir. The aim of this research is to estimate a predictive model for landslides on natural slopes, based on the Preliminary Safety Factor (PSF). The methodology was based on the limit equilibrium method for infinite slopes, using techniques available in Geographic Information Systems. Scenarios with zero cohesion and neutral pressure increased the susceptibility to mass movements, reducing the Preliminary Safety Factors. Due to the proximity of the reservoir to the slopes and considering the seasonality between the dry and wet seasons, there is constant variation in the parameters of cohesion and neutral pressure, resulting in maps with dynamic characteristics in the analysis of slope stability.