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Brazilian Archives of Biology and Technology

Print version ISSN 1516-8913

Abstract

CARDOSO, Célio Orli; BERTOL, Idelgardis; SOCCOL, Olívio José  and  SAMPAIO, Carlos Augusto de Paiva. Generation of intensity duration frequency curves and intensity temporal variability pattern of intense rainfall for Lages/SC. Braz. arch. biol. technol. [online]. 2014, vol.57, n.2, pp.274-283.  Epub Nov 19, 2013. ISSN 1516-8913.  http://dx.doi.org/10.1590/S1516-89132013005000014.

The objective of this work was to analyze the frequency distribution and intensity temporal variability of intense rainfall for Lages/SC from diary pluviograph data. Data on annual series of maximum rainfalls from rain gauges of the CAV-UDESC Weather Station in Lages/SC were used from 2000 to 2009. Gumbel statistic distribution was applied in order to obtain the rainfall height and intensity in the following return periods: 2, 5, 10, 15 and 20 years. Results showed intensity-duration-frequency curves (I-D-F) for those return periods, as well as I-D-F equations: i=2050.Tr0,20.(t+30)-0,89, where i was the intensity, Tr was the rainfall return periods and t was the rainfall duration. For the intensity of temporal variability pattern along of the rainfall duration time, the convective, or advanced pattern was the predominant, with larger precipitate rainfalls in the first half of the duration. The same pattern presented larger occurrences in the spring and summer stations.

Keywords : maximum rainfall; I-D-F curves; Gumbel distribution; intensity rainfall.

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