Caracterização ambiental e análise morfométrica da Bacia Hidrográfica do rio Itaueira, Piauí, Brasil

Abstract

The study aimed to perform geoenvironmental characterization, particularly morphometric, of the Itaueira River Basin, state of Piauí, from geometric variables, drainage network and relief, as a possibility to know the environmental dynamics of the basin. For this purpose it used the Digital Elevation Model (DEM) to calculate the morphometric parameters related to the geometric characteristics, drainage network and relief. Thus, the study indicated that the basin area studied is 10122.4 km2 and a perimeter of 757.03 km2 . In turn, the basin has an elongated profile and low predisposition to abrupt flooding, as its compactness coefficient is 2.1068, form factor 0.12 and circularity index of 0.222. The total length of the watercourses is 735.2 km, drainage density 0.073 km/km², hydrographic density 0.0014 and 3rd order river channels. The altitude and average slope found were 371.7 m and 4.81%, respectively, while its roughness index was 44.238.