Análise de séries temporais da Q7 em duas estações fluviométricas da bacia hidrográfica do Rio Araguari, em Minas Gerais

Abstract

The grows of the population and consequently the demand for natural resources promote constant concern, how far do environmental limits go? Therefore, it becomes necessary to create management and monitoring mechanisms that are able to ensure the supply of the needs of current and future generations, human and animal. One of these mechanisms is the granting of water use, which, in the state of Minas Gerais, is based on the value of Q7,10, minimum flow of seven days in duration and ten years of recurrence. In this sense, the present work sought to make a comparison between the evolution of land use and occupation through digital image processing of the drainage areas of two fluviometric monitoring stations, and the analysis of their respective historical flow series through the minimum average of seven days, applying the Durbin-Watson aucorrelation and Mann-Kendall stationarity tests. The analyzed stations are located in the Araguari River Basin. The dry period of each year was considered, starting in the 70's until the present day. As a result, it was possible to identify a downward trend in the Q7 lines annually only for the month of September, in which there was a 53.5% drop in the value between the years 1974 and 2018, evidenced by the regression line, which has an angular coefficient equal to -0.0268, as well as in the ground cover by dense vegetation, which reached a loss of 67.5% for the area of one of the analyzed stations.