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The River Amazon at Obidos (Brazil): Statistical studies of the discharges and water balance

Callede, J ; Guyot, J L ; Ronchail, J ; Molinier, M ; De Oliveira, E

Hydrological sciences journal, 2002-04, Vol.47 (2), p.321-333 [Periódico revisado por pares]

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  • Título:
    The River Amazon at Obidos (Brazil): Statistical studies of the discharges and water balance
  • Autor: Callede, J ; Guyot, J L ; Ronchail, J ; Molinier, M ; De Oliveira, E
  • Assuntos: Brazil, Obidos, Amazon R ; Freshwater
  • É parte de: Hydrological sciences journal, 2002-04, Vol.47 (2), p.321-333
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    content type line 23
    ObjectType-Feature-2
  • Descrição: New discharge measurements carried out within the "Hidrologia e geoquimica na Bacia Amazonica" (HiBAm) Project at Obidos have improved the knowledge about the hydrological characteristics of the Amazon at this station, which controls the highest discharges in the world. A new correction method determines the daily discharge with an accuracy of plus or minus 3.0%. The reconstruction of the missing data, using observations from Manaus, makes it possible to build a chronology for almost one century. With this sample starting in 1902, the interannual average discharge of the Amazon at Obidos is 163 000 m super(3) s super(-1), with an extremely weak irregularity coefficient (K3 = 1.28). The decennial low water (78 000 m super(3) s super(-1)) is similar to the centenary flood of the River Congo at Brazzaville. The decennial flood is estimated to be 260 000 m super(3) s super(-1). Water balance studies indicate an outflow deficit of 1193 mm, which can be identified with actual evapotranspiration. In conclusion, the Amazon is confirmed to be the most powerful and regular river of the planet.Original Abstract: Effectuees dans le cadre du Projet Hidrologia e geoquimica na Bacia Amazonica (HiBAm), les nouvelles mesures de debit a Obidos ont ameliore la connaissance des caracteristiques hydrologiques de l'Amazone a cette station qui controle les plus forts debits du monde. Une nouvelle methode de correction determine les debits journaliers avec une precision de plus or minus 3.0%. La reconstitution des periodes manquantes, avec les observations faites a Manaus, permet de disposer d'une chronologie de pres d'un siecle. Avec cet echantillon commencant en 1902, le modele interannuel de l'Amazone a Obidos est de 163 000 m super(3) s super(-1), avec un coefficient d'irregularite extremement faible (K3 = 1.28). L'etiage decennal (78 000 m super(3) s super(-1)) est de meme grandeur que la crue centenaire du Congo a Brazzaville. La crue decennale est estimee a 260 000 m super(3) s super(-1). Le Bilan hydrologique indique un deficit d'ecoulement de 1193 mm, qui peut etre assimile a l'evapotranspiration reelle. En conclusion, l'Amazone est bien le fleuve le plus puissant et le plus regulier de la planete.
  • Idioma: Francês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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