ESTUDO DA BACIA DO RIBEIRÃO JOÃO LEITE (GO, BRASIL): UMA ANÁLISE MORFOMÉTRICA E DAS AÇÕES HUMANAS

Abstract

This research consists of the application of geoprocessing and remote sensing techniques for the analysis of the Ribeirão João Leite watershed, located in the Brasília-Goiânia axis, which has an approximate area of 761 km². In this study, the environmental impacts in the Riberião João Leite watershed are recognized and susceptibility and potentiality to laminar erosion are identified through the application of techniques of geotechnology, morphometric techniques and field work. The methodology consists of generating a Digital Terrain Model (DTM), using Alos-fbs Palsar radar images with a spatial resolution of 12.5 meters, which allowed the modeling of the relief of the watershed and generating information plans with terrain slopes, and a land cover and land use map, using OLI sensor images, aboard the Landsat 8 platform, which by means of spectral fusion allows a panchromatic band with resolution of 15 meters. For digital image classification, the Maximum Likelihood Classification algorithm was used, resulting in a high level of detail mapping. were used the work carried out by Oliveira (1996), who elaborated the soil mapping of Ribeirão João Leite watershed in the 1:50.000 scale. The soil classes, as well as their characteristics, were used in the present study as reference for the refinement of the final version of the soil map. Among the models used to simulate laminar erosion, the methodology proposed by Salomão (1992) was used. It was also determined the conservation practices, integral of this model, the erodibility of the soils and the set of ramp length and degree of slope. With the maps of the natural and anthropic elements, it was possible to provide elements for future works that seek guidelines of land use and occupation practices, making it possible to identify the impacts of anthropic interference on BHRJL.