ANÁLISE MORFOMÉTRICA E NEOTECTÔNICA DA BACIA HIDROGRÁFICA DO RIO VERMELHO – SUDESTE DO PARÁ

Morphometric and neotectonic characterization of the Vermelho River hydrographic basin - Southeast Pará

Abstract

This work presents the morphometric analysis and the application of geomorphic indices in order to evaluate the neotectonic influence on Rio Vermelho Hydrographic Basin (BHRV), located in the southeastern of Pará state. From the Digital Elevation Model (MDE) analysis, the geometric characteristics fo relief and drainage network of the basin were defined, and then, used the indexes: Declivity-Extension Ratio (RDE), Asymmetry Factor (FA), Integral Hypsometric (IH) and Sinuosity of Front Mountain (SMF) in twenty-seven sub-basins. These four indices were combined to produce the Relative Tectonic Activity Index (IAT), divided into four classes, according to the coefficient of intensity tectonic activity. As result, approximately 44% of BHRV corresponded to class 1 (very high tectonic activity), 37% corresponded to class 2 (high tectonic activity) and only 18% corresponded to class 3 (which indicates moderate tectonic intensity). No sub-basin presented class 4, which indicates that BHRV has high neotectonic activity.