Índices geomórficos para análise do quadro morfoestrutural e morfotectônico da bacia hidrográfica do rio Bagagem, sudeste do Tocantins

Abstract

The morphological characterization of a watershed is of great importance for understanding its behavior in the context of landscape dynamics. Through morphometry, it is possible to get parameters that indicate the behavior of this geographic area, such as the geological control of drainage and its reflection on hydrological dynamics. The presente article aimed to characterize the fluvial geomorphology of the Bagagem river basin in order to understand the morphogenesis and morphodynamics of its landscape. In this way, geoprocessing was used with the elaboration of maps of fluvial hierarchy, slope and hypsometry. The following morphometric parameters were calculted: relief ratio, hydrographic density, drainage density, maintenance coefficient, channel gradient, sinuosity index, circularity index, transverse topographic symmetry factor and drainage basin asymmetry factor. The results showed that the basin develops over sedimentary rocks and quaternary covers, presenting a dendritic drainage pattern. The basin has a low slope and indicates the elongated shape, where the rainfall contributions occur unconcentrated along the drainage network, not contributing to floods. As it is located in an intraplate environment, in the crystalline terrains of cratonic edges, it is influenced by neotectonic movements that affect the faults of the Tocantins Orogenic System.