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Evolution of the River Amazon's discharge at Obidos from 1903 to 1999

Callede, J ; Guyot, J L ; Ronchail, J ; L'Hote, Y ; Niel, H ; de Oliveira, E

Hydrological sciences journal, 2004-02, Vol.49 (1), p.85-97 [Periódico revisado por pares]

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  • Título:
    Evolution of the River Amazon's discharge at Obidos from 1903 to 1999
  • Autor: Callede, J ; Guyot, J L ; Ronchail, J ; L'Hote, Y ; Niel, H ; de Oliveira, E
  • É parte de: Hydrological sciences journal, 2004-02, Vol.49 (1), p.85-97
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    content type line 23
    ObjectType-Feature-2
  • Descrição: The time series of 97 annual values, observed or reconstituted, of runoff of the River Amazon at Obidos shows a slight increase of 9% in the mean annual discharges from 1903 to 1999, and of 10% for the floods. All the rupture tests indicate a break in 1970, for the mean annual discharges as well as for the floods. The evolution of the coefficients of variation indicates a reduction in the interannual variability of the mean discharges and floods, from 1927 to 1970. The comparison between the evolution of the mean annual discharges and the average annual rainfall of the basin, from 1945 to 1998, exhibits a good correlation between precipitation and runoff. Finally, the analysis of the evolution of the mean annual discharge and the average annual rainfall, expressed as a percentage of the deviation from the 1945-1998 averages, demonstrates an increase in the flow in relation to the rainfall, which could be the consequence of the Amazonian deforestation.Original Abstract: La serie chronologique de 97 valeurs annuelles, observees ou reconstituees, des debits de l'Amazone a Obidos montre une legere augmentation des modules (9%) de 1903 a 1999 et des crues (10%). Tant pour les modules que pour les crues, tous les tests de rupture indiquent une cassure en 1970. L'evolution des coefficients de variation montre une diminution de la dispersion interannuelle des modules et des crues, de 1927 a 1970. La comparaison de l'evolution des modules avec la pluviometrie moyenne annuelle du bassin, de 1945 a 1998, indique une bonne correlation pluie-debit. Enfin l'analyse de l'evolution des modules et des pluviometries moyennes annuelles, en pourcentage de l'ecart a leurs valeurs moyennes 1945-1998, met en evidence une augmentation de l'ecoulement par rapport a la pluie tombee, qui pourrait etre la consequence de la deforestation amazonienne.
  • Idioma: Francês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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