Equações de intensidade-duração-frequência de chuvas para o estado do Piauí
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Data
2014-09
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Resumo
This work aimed to adjust and compare the parameters (K, a, b and c) of the intensity-duration-frequency
equations of the maximum rainfall taken from 133 rainfall stations located in the state of Piauí in Brazil, which are
available from the database of the National Water Agency - ANA. The stations were initially chosen by analysis of the
consistency of the data series, and then from these, 105 rainfall stations were then selected. The maximum rains for one
day were separated into durations of 5, 10, 15, 20, 25, 30, 60, 360, 480, 600 , 720 and 1440 minutes and the maximum
rainfall estimated using probabilistic models for each duration and each return period of 5, 10, 25, 50 and 100 years.
The parameters (K, a, b and c) were then adjusted by means of both linear and nonlinear regression. The adjustment
of the parameters of the intensity-duration- frequency equation for maximum precipitation, carried out using nonlinear
regression, had R 2 (0.99) higher than the values adjusted using linear regression (0.98).
Descrição
Palavras-chave
Hidrologia, Chuvas-frequência da intensidade, Precipitação, Hydrology, Heavy rains, Return period
Citação
CAMPOS, Alcinei Ribeiro; SANTOS, Glenio Guimarães; SILVA, João Batista Lopes; IRENE FILHO, João; LOURA, Domingos de Sousa. Equações de intensidade-duração-frequência de chuvas para o estado do Piauí. Revista Ciência Agronômica, Fortaleza, v. 45, n. 3, p. 488-498, jul./set. 2014.