Intensity-duration-frequency relationships of rainfall through the technique of disaggregation of daily rainfall
AUTOR(ES)
Dorneles, Viviane R.
FONTE
Rev. bras. eng. agríc. ambient.
DATA DE PUBLICAÇÃO
10/07/2019
RESUMO
RESUMO A relação intensidade-duração-frequência de ocorrência de precipitação é uma técnica que pode subsidiar estudos hidrológicos em modelos de transformação chuva-vazão, muitas vezes, utilizada no dimensionamento de obras hidráulicas. Objetivou-se verificar se há diferença significativa entre as relações, cujos valores de intensidades máximas anuais foram obtidos a partir da desagregação da chuva máxima diária e registros pluviográficos, nas durações de 5, 10, 15, 20, 30, 60, 120, 360, 720 e 1440 min e para os períodos de retorno de 2, 5, 10, 20, 25, 50 e 100 anos, na localidade de Pelotas/RS, Brasil (31° 46’ 34’’ S; 52° 21’ 34’’ O, altitude de 13,2 m). Pelo teste t de Student, constatou-se que não há diferença significativa entre os valores de intensidades máximas obtidos a partir de registros pluviográficos e àqueles mediante a desagregação de dados pluviométricos diários.ABSTRACT Rainfall intensity-duration-frequency (IDF) relationships are a tool that can be used in modeling the transformation of rainfall to runoff, required for the design of hydraulic works. The objective of this study was to verify if there is a significant difference between the intensity-duration-frequency relationships generated using pluviographic records and those determined from pluviometric data. Maximum annual rainfall intensity values were obtained from the disaggregation of maximum daily rainfall and rainfall records in the durations of 5, 10, 15, 20, 30, 60, 120, 360, 720 and 1440 min and for the return periods of 2, 5, 10, 20, 25, 50 and 100 years, in the locality of Pelotas, Rio Grande do Sul state, Brazil (31° 46’ 34’’ S; 52° 21’ 34’’ W, altitude of 13.2 m). By Student’s t-test, it was verified that there is no significant difference between the values of maximum rainfall intensity obtained from pluviographic records and those determined from pluviometric data.
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