Equações de intensidade de chuvas para o Estado do Maranhão
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Data
2015-10
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Resumo
Studies of spatial and temporal distribution of rainfall are of extreme importance for security in planning and execution
of hydraulic projects and environmental conservation, so work to determine the intensity-duration-frequency curves
of rainfall are indispensable for the planning and construction of hydraulic works. Currently the state of Maranhão
provides little information related to the curves of intensity-duration-frequency of rainfall, so studies are necessary
to develop the curves for its various municipalities. In this context the objective of this work was to determine the
parameters of the intensity-duration-frequency equation for 163 rainfall stations located in the state of Maranhão.
Data were obtained from the National Water Agency database. For adjustment of intensity-duration-frequency curves
the rainfall breakdown method was used, considering the probabilistic model of Gumbel for estimating the maximum
values in different time durations and return period. Upon acquisition of these values the parameters K, a, b and c of
the intensity-duration-frequency curves were adjusted by the least squares method. The parameters K, a, b and c of the
intensity-duration-frequency curves show good adjust, with 99.7% of curves presenting r 2 greater than 0.98.
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Chuvas extremas, Período de retorno, Modelos probabilísticos, Extreme rainfall, Probabilistic models, Return period
Citação
CAMPOS, Alcinei Ribeiro; SANTOS, Glenio Guimarães; ANJOS, João Carlos Rocha dos; ZAMBONI, Diane Cristina Stefanoski; MORAES, Jaurene Moura Fé. Equações de intensidade de chuvas para o Estado do Maranhão. Engenharia na Agricultura, Viçosa, v. 23, n. 5, p. 435-447, set./out. 2015.