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Engenharia Agrícola

versão impressa ISSN 0100-6916

Resumo

CARVALHO, Daniel F de et al. Erosivity indexes EI30 and KE>25 at Seropedica, Rio de Janeiro State, Brazil: distribution, occurrence probability and return period. Eng. Agríc. [online]. 2010, vol.30, n.2, pp.245-252. ISSN 0100-6916.  http://dx.doi.org/10.1590/S0100-69162010000200006.

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 EI30 and KE>25. With the obtained results, it was possible to conclude that: a) the annual erosivity indexes values EI30 and KE>25 were 5,960.4 MJ mm ha-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 EI30 of 5,995; 7,262; 7,684; 7,895 8,022 and8,064 MJ mm ha-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.

Palavras-chave : rainfall erosivity; soil erosion; probability function.

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