Erosividade e padrões de precipitação pluvial para Aragarças – GO

Abstract

Rain is the climatic factor that has greater influence on the erosion in the tropical regions due to its characteristics, intensity, duration and frequency. Knowing the erosive potential of rainfall and its distribution throughout the year allows the planning of management practices that aim to reduce water erosion and soil losses. In this work, it is proposed to define for the locality under influence of the rainfall station (code: 83368) in the municipality of Aragarças - GO, the R factor of the USLE, the rainfall patterns and the months that have the greatest erosive potential. A rainfall series from the period from 2002 to 2007 and a rainfall series from 1990 to 2014 were used. The data were converted to the digital format and, at the end of this phase, systematized and submitted to Chuveros software for the determination of erosivity indices (EI30 and KE> 25) and advanced, intermediate and delayed precipitation patterns. In the studied period, the average annual rainfall of the study site was 1,571.6 mm, with 91% of the rainfall concentrated from October to March. The mean annual values of EI30 and KE> 25 were 7,384.2 MJ mm ha-1 h-1 year-1e and 127.9 MJ ha-1ano-1, respectively. The advanced hydrological pattern was the highest frequency, followed by the intermediate and delayed patterns.