Determinação da curva de intensidade, duração e frequência de precipitação do município de Vianópolis – Goiás utilizando o software GAM-IDF

Abstract

Precipitation is considered to be one of the most important meteorological variables during the climatic study of a region, and the knowledge of maximum precipitation is of extreme importance for the design of hydraulic works, flood and erosion control. The study of maximum rainfall can be done through the intensity, duration and frequency relationships. This work aims to determine the IDF relationship for the city of Vianópolis - GO, through the GAM-IDF software, as a way to provide greater security for the design of future works. For this study, historical rainfall data spanning 40 years, from 1973 to 2012, were used. The adjustment of the data was done through the Gumbel statistical distribution, considering return periods of 2, 5, 10, 20, 50 and 100 years. The goodness of fit of the probability distribution was verified using the Anderson-Darling test with a significance level of 5%. The GAM-IDF software adjusted the parameters (a = 748,546; b = 0,168; c = 9,214; and d = 0,706) of the equation and evaluated this fit using the Nash-Sutcliffe coefficient, resulting in 0,9969. Therefore, this study contributed to the determination of the equation for intense precipitation, allowing its use for the design of hydraulic projects in the municipality.