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One of the main topics in the study of droughts is how to define this phenomenon qualitatively and quantitatively. Using a drought index, the Standardized Precipitation Index (SPI), an attempt was made to characterize the phenomenon quantitatively for the Upper São Francisco basin. Regional frequency analysis techniques were used with L-moments to calculate the SPI. The SPI-7 was calculated for the period from April to October, a scale that may be appropriate to characterize agricultural droughts in the region. Through regional analysis, precipitation thresholds were estimated that could characterize both dry periods and rainfall periods in the region from April to October. The use of regional analysis to calculate SPI improves the estimation which may be compromised by the small size of the samples available to calculate the index with conventional methods to estimate parameters. Key-words: Droughts, Standardized Precipitation Index, Regionalization, Index-Flood , L-Moments.

rbrh

Definição de Liminares de Secas e Cálculo do Índice de Precipitação Padronizada por Meio de Análise Regional de Frequências na Bacia do Alto São Francisco