Estimate of intense rainfall equation parameters for rainfall stations of the Paraíba state, Brazil
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Data
2017-03
Título da Revista
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Editor
Evandro Novaes
Resumo
Rainfall is the primary water source for hydrographic
basins. Hence, the quantification and knowledge of its
temporal and spatial distribution are indispensable in
dimensioning hydraulic projects. This study aimed at
assessing the fit of a series of rainfall data to different
probability models, as well as estimating parameters of
the intensity-duration-frequency (IDF) equation for rain
stations of the Paraíba State, Brazil. The rainfall data
of each station were obtained from the Brazilian Water
Agency databanks. To estimate the maximum daily
rainfall of each station and return period (5, 10, 15, 25,
50 and 100 years), the following probability distributions
were used: Gumbel, Log-Normal II, Log-Normal III,
Pearson III and Log-Pearson III. The estimation of rainfall
in durations of 5-1,440 min was carried out by daily rainfall
disaggregation. The adjustment of the IDF equation was
performed via nonlinear multiple regression, using the
nonlinear generalized reduced gradient interaction method.
When compared to the data observed, the intense rainfall
equations for most stations showed goodness of fit with
coefficients of determination above 0.99, which supports
the methodology applied in this study.
Descrição
Palavras-chave
Hidrologia, Equação intensidade-duraçãofrequência, Pluviosidade, Hydrology, Intensity-duration-frequency equation, Rainfall
Citação
CAMPOS, Alcinei Ribeiro; SILVA, João Batista Lopes da; SANTOS, Glenio Guimarães; RATKE, Rafael Felippe; AQUINO, Itauane Oliveira de. Estimate of intense rainfall equation parameters for rainfall stations of the Paraíba state, Brazil. Pesquisa Agropecuária Tropical, Goiânia, v. 47, n. 1, p. 15-21, jan./mar. 2017. Disponível em: <https://www.revistas.ufg.br/pat/article/view/43821/22553>.