Distribuição, probabilidade de ocorrência e período de retorno dos índices de erosividade EI30 e KE>25 em Seropédica - RJ
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Data
2010-04
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Resumo
This work was carried out in order to study the distribution, the occurrence
probability and the return period of the rainfall erosivity in Seropédica city, Rio de Janeiro State,
Brazil. It was considered a continuous rain gauges series for the period from 1973 to 2002, and by
using specific adjustment models for the region, it was determined the annual and monthly erosivity
indexes EI 30 and KE>25. With the obtained results, it was possible to conclude that: a) the annual
erosivity indexes values EI 30 and KE>25 were 5,960.4 MJ mm ha -1 h -1 and 99.2 MJ ha -1 ,
respectively, which was expected to occur at least once every 1.97 year, with an occurrence
probability of 50.82%; and b) annual values EI 30 of 5,995; 7,262; 7,684; 7,895 8,022 and
8,064 MJ mm ha -1 h -1 and annual values KE>25 of 99.8; 122.7; 130.3; 134.1; 136.4 and
137.1 MJ ha -1 are expected at least once every 2; 5; 10; 20; 50 and 100 years, respectively.
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Erosividade da chuva, Função de probabilidade, Erosão hídrica, Rainfall erosivity, Soil erosion, Probability function
Citação
CARVALHO, Daniel F. de; MACHADO, Roriz L.; EVANGELISTA, Adão W. P.; KHOURY JÚNIOR, Joseph K.; SILVA, Leonardo D. B. da. Distribuição, probabilidade de ocorrência e período de retorno dos índices de erosividade EI30 e KE>25 em Seropédica - RJ. Engenharia Agrícola, Jaboticabal, v. 30, n. 2, p. 245-252, mar./abr. 2010.