ALTERAÇÕES NO USO E OCUPAÇÃO DO SOLO E OS IMPACTOS NAS VAZÕES DE BACIAS HIDROGRÁFICAS AGRÍCOLAS AFLUENTES AO RESERVATÓRIO DO DESCOBERTO (DF/GO)

Changes in land use and occupation ans impacts on flows of agricultural tributaries watersheds of the Descoberto's reservoir in Brazil

Abstract

Geoprocessing techniques for mapping land use are a crucial instrument for understanding the evolution of occupation and water behavior of watersheds. This study aimed to analyze the changes in land use in affluent watersheds of the Descoberto reservoir, the main source of human supply in the Federal District- Brazil, correlating use with the impacts of changes in the watersheds' outflows streams. Scenarios for the years 1964, 1980, 2009, and 2019 were built with the support of aerophotogrammetric and satellite images in GIS software for Capão Comprido and Rodeador watersheds. Land use and occupation evolution in both watersheds showed similar results in all scenarios, which indicates the homogeneity of use in the upstream Descoberto reservoir region. There was a trend of decreasing areas of native vegetation and growth of agricultural use in the first three periods and the stability of this coverage between the years 2009 and 2019. There was an increase in infrastructure areas that are indicative of irregular parceling land and urbanization. The integrated analysis results showed a high impact, since 1964, on tributary quantitative water availability.

Keywords: Land use and occupation. GIS. Scenarios.