Time distribution of heavy rainfall events in Urussanga, Santa Catarina State, Brazil

Abstract

ABSTRACT.A knowledge of rainfall time distribution is important for several types of hydrological studies related to surface runoff. This study aims to determine the time distribution pattern of heavy rain events in Urussanga, Santa Catarina State, Brazil. It employed recording rainfall charts from the meteorological station of Urussanga (latitude: 28.31° S, longitude: 49.19° W, altitude: 49 m) from 1980 to 2007. Rain events were classified into four types according to the duration quartile in which the greatest amount of precipitation occurred. It is found that type I rain events are more frequent, followed by type II, and these occur predominantly during the summer, while type III and IV rain events are distributed throughout the year. In the summer, rain events that last for less than 12 hours are more frequent, whereas during the rest of the year, rain events that last for more than 18 hours are most common.

Sub-hourly rainfall patterns by hyetograph type under distinct climate conditions in Northeast of Brazil: a comparative inference of their key properties

“…up to 64%, 54% and 49% in AEB, CEB, and GEB, respectively. This is in accordance with Back (2011), which showed that in Brazil the rainfall events tend to concentrate their rainfall depths mainly in the first and second quartiles. The presence of R-events after the reclassification in GEB typifies the slight and uniform rainfall event commonly found in shallow convective clouds, which occur more frequently over the ocean and coastal areas from March to August in tropical Northeast region of Brazil (BRINGI et al, 2003;DILMI et al, 2016;PALHARINI;VILA, 2017;TEIXEIRA, 2008).…”

“…Changes in rainfall distribution affect the highest fraction positively and the lowest fraction of individual storms negatively, especially under higher temperatures (WASKO; SHARMA, 2015). Also, Back (2011) showed that rainfall events concentred in the first and second hyetograph quartiles are more frequent along summer season in the tropical wet regions of Brazil. As a result, a unimodal (triangular) hyetograph type influences the time-to-peak and shape of runoff hydrographs (BALL, 1994); meanwhile, a rectangular hyetograph affects the infiltration and runoff generation processes (DUNKERLEY, 2012).…”

Sub-daily rainfall events in an arid environment with marked climate variability: Variation among wet and dry years at Fowlers Gap, New South Wales, Australia

“…Further procedural details can be found in Huff (1967) and Bonta (2004). Huff quartiles are widely used in the analysis of rainfall event profiles (Azli and Rao, 2010;Back, 2011;Bonnin et al, 2006;Bonta and Shahalam, 2003;Powell et al, 2007;Sharafati and Zahabiyoun, 2013;Vandenberghe et al, 2010).…”

Caracterização das chuvas erosivas em Urussanga, SC, com relação ao padrão de distribuição temporal

“…Essa constatação deve-se em parte ao fato de no verão predominarem as chuvas intensas do tipo convectivo, que são caraterizadas pela curta duração, enquanto no inverno prevalecerem as do tipo frontais, distinguidas pela longa duração. Resultados semelhantes foram obtidos por Back (2011).…”