Based on studies of the United Nations Population Fund (UNPA), 82% of South America populations live in urban areas as of 2007, with a rate of growth about 1,7% a year. In Brazil, 70% of the population lives in the area originally covered by the Atlantic Forest (Mata Atlântica). The urban sprawl has been degrading the original ecosystem, and the current impact on the environment will not be easily reversed. Therefore, the goal of this paper is to analysize the changes in precipitation patterns over the past 5 decades and their possible associations to the gradient of urbanization in Eastern of São Paulo State, Brazil. We used precipitation time series of from Agência Nacional das Águas (ANA) and NOAA Analysis (National Oceanic and Atmospheric Administration), and satellite images from LANDSAT. The low frequency effects are filtered in the rainfall time series. The data was grouped in 10-year subsets and then, the annual distribution was analyzed comparing each decade in order to evaluate the changes in precipitation over the last 50 years. The results show a change in the annual distribution along the time.
Redes Sociais