ESTIAGENS EXTREMAS AFETAM A AGRICULTURA NO ESTADO DO PARANÁ, BRASIL
DOI:
https://doi.org/10.15809/irriga.2021v1n2p297-307Abstract
The drought is a meteorological phenomenon that causes relevant impacts for the agricultural sector, being considered the main frustrator of crops. The objective of this work was to quantify the risks of extreme drought in different macroregions in the state of Paraná in the four seasons of the year. Daily rainfall data from 30 weather stations were used from 1976 to 2015. For each year, the number of days without rainfall for the summer, autumn, winter, and spring quarters was determined. The droughts were identified using the Gumbel probability density function, with the α and β parameters obtained by the Lieblein method at 20% probability. It was concluded that the state of Paraná is subject to drought periods longer than 60 days, at any time of the year. The northern and northwestern regions are subject to increased risks of extreme drought, followed by the central, western and coastal regions. Spring and summer are the seasons with the lowest risk of drought, while autumn and winter are the most risky.
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