Influência do uso e ocupação do solo sobre a vazão do alto da bacia do Rio Verde Grande - MG

Abstract

The Rio Verde Grande watershed is characterized by low water availability and high climatic variability with the highest rainfall levels concentrated in the headwaters of the basin, which causes constant conflicts by the water re-source, which is not enough to meet the population water supply. In order to do so, it is necessary may to be able to reconcile the water demand and water supply, requiring studies that guide the proper management of this resource. In this context, the objective of this work was to evaluate the interference of the land use dynamics in the streamflow of upper watershed of the Rio Verde Grande (AVG). The thematic maps of the land use of the AVG were made using digital orbital image processing for the years 1994, 2004 and 2014, with the purpose of temporal analysis of the land use of watershed. From the thematic maps, the areas of each land use in the proposed periods were obtained and a comparison was made with the hydrological behavior of a streamflow series corresponding to the AVG stretch. The mean flow rates for long period, mean maximum flow, average minimum flow, Q90% and Q95%, as well as the precipitation data for the period studied were analyzed. Based on the results obtained, little influence of soil use and occupation in the AVG basin has been observed, as well as the behavior of the river streamflows in its main channel, being these closely related to precipitation.