Journal
RBRH-REVISTA BRASILEIRA DE RECURSOS HIDRICOS
Volume 25, Issue -, Pages -Publisher
ASSOC BRASILEIRA RECURSOS HIDRICOS-ABRH
DOI: 10.1590/2318-0331.252020180182
Keywords
Droughts; Hydrological droughts; Archimedean copulas; Gaussian copula; Theory of runs; Frequency analysis
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Funding
- Sao Paulo Research - FAPESP [02/02365-1]
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This study presents a method based on Archimedean and Gaussian copulas to simulate the occurrence of hydrological droughts. The droughts were characterized by theory of runs for four threshold levels and six univariate probability distributions were evaluated to represent the probabilistic behavior of their severities and durations. The Akaike Information Criterion was used to select the better univariate probabilistic models, while their hypotheses of goodness-of-fit to the historical data were evaluated by Kolmogorov-Smimov test. Based on the univariate probability distributions of severities and durations, Archimedean and Gaussian copulas were used in the bivariate analysis of the drought events. The proposed method proves to be a useful tool to simulate the occurrence of drought events, preserving the laws of probability of the severities and durations and the dependency between both.
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