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Callède, J., Ronchail, J., Guyot, J.L., and De Oliveira, E. (2008) Amazonian deforestation: its influence on the Amazon discharge at Óbidos (Brasil). Rev. Sci. Eau 21 (1) : 59-72. [article in French]

Original title: Déboisement amazonien : son influence sur le débit de l'amazone à Óbidos (Brésil).

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This survey completes our earlier work on the evolution of the Amazon discharge at Óbidos from 1903 to 1999. In the Amazon basin above Óbidos (4,680·103 km²), 341·103 km² were deforested between 1976 and 2003. The impact of this deforestation on the mean annual discharge was estimated using a water balance approach from 1940 to 2003. The evolution of the runoff coefficient indicates that there was a 5% increase in the mean annual discharge over the 22 years from 1981 to 2003. The number of strong floods was five time higher during this period than it was before. On the other hand, it seems that there is no influence of the deforestation on the low flows. Key-words: South America, Amazon catchments, Óbidos, rainfall, discharge, water balance, deforestation.

Corresponding author

Ronchail, J. : LOCEAN/IPSL et Département de Géographie de l’Université Paris VII, 4, place Jussieu, 75005 Paris, France 2 IRD, Casilla 18, 1209 Lima

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Update: 2008-07-03
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