Análise morfométrica da sub-bacia hidrográfica do córrego Varjão da Cutia, Alegre-ES

Abstract

Morphometric analysis helps to understand the hydrological dynamics of a study unit. Thus, this study aims to understand the structure of the morphometric characteristics in the area of the Hydrographic Sub-Basin of the Varjão da Cutia Stream, which belongs to the Rio Alegre Hydrographic Basin, is located in the municipality of Alegre, Espírito Santo. It is used largely by agricultural activities and growing urbanization is taking place. For this, information obtained through the topographic chart of Alegre-ES, in the scale of 1: 50,000, sheets SF-24-AV-1, SF-24-VAV-2, SF-24-VAV-3 and SF- 24-VAV-4 (IBGE, 1997), to analyze the morphometric characteristics of the geometry, the terrain and the drainage network. The geographic information system (GIS) was adopted using the QGIS 3.10.6 software, which allowed for the spatial analysis of the vector and matrix bases. The Circularity Index (Ic) of the basin was 0.671 (km2 / km2) and the Compaction Coefficient (Kc) of 1.212 (km / Km). Among the results, it is noteworthy that the Córrego Varjão da Cutia sub-basin has a high susceptibility to flooding, having the characteristic of a circular basin, with strongly wavy relief, medium capacity to generate new channels. The study made it possible to analyze the sub-basin, showing the interference of morphometric parameters in its water dynamics. Thus, they are parameters that must be considered for projects aimed at environmental preservation. And the geoprocessing techniques for the delimitation and morphometric characterization of the sub-basin, proved to be an excellent tool for this purpose.