Intensity and distribution in the space-time of the rain erosivity in Goias and Federal District states

Abstract

The ability of rainfall to promote soil disaggregation and transport depends on its intensity and distribution over time, allowing proper soil and water management practices in order to minimize their effects in and outside food production fields. The objective of this study was to verify the intensity of the spatial and temporal distribution of rainfall erosivity in Goias and Federal District states using historical series of rainfall data available at the National Institute of Meteorology (Inmet) from 1986 to 2017. Rainfall erosivity (EI) for Goias and Federal District were estimated using the modified Fournier index. Annual average for factor R were obtained by the sum of the EI in the 12 months of the year. Data were placed to descriptive analysis and classification according to their erosive capacity. The annual mean of the factor R for the study region was 8,834±5.2 MJ mm ha-1 h-1 ano-1, being classified as a strong erosive potential. However, considering the territory, its intensity in Goiás and DF varied from very strong to moderate throughout the year, indicating the need to adopt a conservationist practice that protects the soil from the kinetic energy of rainfall. It is concluded, therefore, that the intensity and distribution of the rainfall erosivity fluctuate both between the municipalities of Goiás (from 4.514±2.5 to 11.215±1.8 MJ mm ha-1 h-1 year-1), and throughout the year (from 180±1.5 to 1.519±4.4 MJ mm ha-1 h-1 month-1).

Erosivity and rainfall patterns for Pirenópolis, Goiás, Brazil

“…Andrade et al (2020b), found for the region of Formosa (GO) average annual erosivity of 8,041.6 MJ mm ha -1 h -1 year -1 for the EI30 index, being from May to September (mainly from June to August) the period with lower and consequently greater erosive potential. Anjos et al (2020) studying the intensity and space-time distribution of rainfall erosivity in the state of Goiá s and Distrito Federal (Pirenópolis, Goiâ nia, Aragarç as, Jataí , Rio Verde, Formosa, Ipameri, Posse, Goiá s, Itumbiara, Catalã o and Distrito Federal) found an average annual R factor of 8,834 MJ mm ha -1 h -1 year -1 , being classified as strong erosive potential.…”

Productivity and penalty in sugarcane from three meteorological databases in Jataí-GO

“…Some studies have already used estimated databases, obtaining positive results, especially the database known as Xavier and NASA POWER (NASA Prediction of Worldwide Energy Resources) (Dender & Sentelhas, 2018, Casaroli et al, 2019, Anjos et al, 2020a.Xav ier's database is limited to The Brazilian territory and was estimated from 3,625 rainfall stations and 735 weather stations installed on the surface of the territory, with the averages corresponding to high resolution grides (0.5 o × 0.5 o ). Nasa POWER data, on the other hand, is based on solar radiation derived from satellite observations and meteorological data from the Goddard Earth Observing System assimilation model, with 1st × 1st grides, available from 1983 to the present day, for any region of the planet Earth.…”