The high variability in the hydrological regime of the Eastern Hydrological Region (EHR) of Northeast Brazil often results in floods and droughts, leading to serious socioeconomic issues. Therefore, this work aimed to investigate connections between spatiotemporal hydrological variability of the EHR and large-scale climate phenomena. Multivariate statistical techniques were applied to relate climate indices with hydrological variables within two representative river basins in the EHR. The results indicated a multi-annual relationship between the state of the sea surface temperature of the Atlantic and Pacific oceans and anomalous hydrological variability in the basins. In addition, the northern Tropical Atlantic conditions were shown to play an important role in modulating the long-term variability of the hydrological response of the basins, whilst only extreme ENSO anomalies seemed to affect the rainy season. This knowledge is an important step towards long-term prediction of hydrological conditions and contributes to the improvement of water resources planning and management in the EHR.
O objetivo deste artigo foi investigar a utilização de técnicas geoestatísticas no estudo da variabilidade espacial de dados pluviométricos para estado de Alagoas, mediante análise da dependência espacial, variograma, técnica de krigagem ordinária e da validação cruzada. Foi utilizado o total anual médio da precipitação de 63 estações pluviométricas no período de 1965 a 1980. A utilização da geoestatística mostrou que as características estruturais da precipitação estão correlacionadas e apresentaram forte dependência espacial. A distribuição espacial da precipitação apresentou variabilidade espacial, com totais pluviométricos que variaram de 500 mm/ano na região do sertão e 2.000 mm/ano no litoral.
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