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.

Erosivity and rainfall patterns for Pirenópolis, Goiás, Brazil

“…The average annual KE>25 index observed for Pirenópolis (GO), was 130.2 MJ ha -1 year -1 (Table 1). Being higher than that found by Castro et al (2021) for the city of Goiá s (GO), with an average annual value of 110.3 MJ ha -1 year -1 and lower than that found by Andrade et al (2020a) for Aragarç as (GO), with an average annual value of 163.1 MJ ha -1 year -1 .…”

“…The erosive rains (27.7%) represented 77.3% of the total rainfall during the 6-year period of the series. In a study conducted by Andrade et al (2020a) in the city of Aragarç as (GO) during the period from 2002 to 2007, they obtained similar values in relation to erosive and nonerosive rainfall, corresponding to a total of 731 individual rainfall, of these 223 (31%) were erosive and 508 (69%) nonerosive, setting an average of 37 erosion and 85 nonerosive rains per year.…”