TENDANCES, RUPTURES ET VARIABILITÉ HYDROCLIMATIQUES DANS L'ÉTAT DU PARANA -BRÉSIL

Abstract : The objective is to analyse the hydroclimatic variability in Parana State-Brazil. We used data from flows stations of Waters Paraná Institute from 1947 to 2011, for four rivers: Tibagi, Ivaí, Piquiri Iguaçu. The flows data were subjected to trend tests (Mann Kendall), homogeneity (change test-Pettitt) and linear regression. Significant positive trends were observed in all four rivers. This increased flow account the value 10% to Tibagi (p = 0.033), 26% to Ivaí (p value = 0.000) 8% to Piquiri (p value = 0.03) and 7% to Iguazu river (p-value = 0.002). This observation shows the significant increase in rates over time related to trends in rainfall over the state in the last thirty years. Statistical changes were observed in Tibagi, Iguacu and Ivaí with de data temporal point in 1969, 1970 and 1968 respectively. Withal they are not linked with rainfall changes observed in the state. The analysis made it possible to identify changes in rates of different signs, when they are subjected to the changes test. A possible hypothetical explanation is it shows a part of hydroclimatic complexity, that cannot be associated with rainfall dynamics in the region.
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Lindberg Nascimento Junior, João Lima Sant'Anna, Vincent Dubreuil. TENDANCES, RUPTURES ET VARIABILITÉ HYDROCLIMATIQUES DANS L'ÉTAT DU PARANA -BRÉSIL. XXVIIIe Colloque de l’Association Internationale de Climatologie, Jul 2015, Liège, Belgique. pp.567-572. ⟨halshs-01176809⟩

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