CARACTERIZAÇÃO MORFOMÉTRICA DA BACIA HIDROGRÁFICA DO RIO DO POMBO - TRÊS LAGOAS-MS

Abstract

This study presents some morphometric indices of the Pombo river basin in the municipality of Três Lagoas-MS, its sources are located in the municipality of Água Clara and its mouth in the Verde river, and its limits with the municipality of Três Lagoas. This work aimed to present a morphometric characterization of the Pombo river basin, to this end, the Digital Elevation Model (DEM) was initially generated, which made it possible to obtain some morphometric parameters for the study of drift dynamics and geomorphology of the basin. It was identified that the area of the river basin is 2,074.94 km² and the perimeter is 242,378.34 km², with its shape being between oval and elongated, according to Horton's classification (1945), Kc 1.48, Kf 0 , 56 and Ic 0.44, the altitude varied between 278 and 529 m, with a predominantly gentle, undulating to flat slope. Having a variation, that is, the highest area between 446 and 529 meters of altitude, in the upper reaches of the Pombo river basin, on both banks, but with a predominance on the left bank. In the middle course, an elevation of 380 m is offered, located on the left bank, where the Pombo waterfall is located in the municipal park area. The hydrography is made up of 5th order river channels, with a variation density of 2.90 km/km², and roughness of 722.1, considered a high value, where the higher the index, the greater the probability of degradation of the surface. basin. The relief ratio of the Ribeirão do Pombo Basin is 276.6, the low index is the result of the low altimetric amplitude (249 m), that is, a low average slope characterizing the relief as smooth flat, thus being a ratio of relief indicates the general declivity or total slope of the watershed surface. Due to geomorphology, the need to further study the denaging and geomorphological dynamics of the Pombo river basin increases even further. Keywords: Morphometry, MDE, slope, density, circularity