Seasonal intensity-duration-frequency relationships for Pelotas, Rio Grande do Sul, Brazil

Abstract

Although several studies have evaluated the intensity-duration-frequency relationships of extreme rainfall events, these relationships under different seasonal conditions remain relatively unknown. Thus, this study aimed to determine whether the intensity-duration-frequency relationships obtained seasonally from the rainfall records in the winter and summer represent the maximum rainfall events for the city of Pelotas, Rio Grande do Sul state, Brazil. Pluviographic data from 1982 to 2015 were used to create two seasonal series: one for the summer from December 21 to March 20 and the other for the winter from June 21 to September 22. These seasonal relationships were compared with the annual pluviographic data. The intensity, duration, and frequency relationships obtained from the summer rain data adequately represented the maximum rainfall in Pelotas, Rio Grande do Sul state, Brazil. The maximum intensity values of rainfall obtained from the relationship of intensity, duration, and frequency for the winter did not adequately encapsulate the occurrence of rain with greater intensities.

Assessing intensity-duration-frequency equations and spatialization techniques across the Grande River Basin in the state of Bahia, Brazil

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“…Rainfall parameters that fit the literature recommendations are necessary when analyzing the frequencies of precipitation heights, stipulating them according to their return time (Tr). The return time (inverse of the frequency) is necessary to decide the degree of protection given to the population or, in other words, the risk to which the population is subject (Passos et al, 2021;Manke et al, 2022).…”

Light Rain Characterization in Piracicaba, São Paulo State, Brazil

“…Rainfall parameters that fit the literature recommendations are necessary when analyzing the frequencies of precipitation heights, stipulating them according to their return time (Tr). The return time (inverse of the frequency) is necessary to decide the degree of protection given to the population or, in other words, the risk to which the population is subject (Passos et al, 2021;Manke et al, 2022).…”