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Scientia Agricola

Print version ISSN 0103-9016

Abstract

MORTATTI, J. et al. HYDROGRAPH SEPARATION OF THE AMAZON RIVER USING 18O AS AN ISOTOPIC TRACER. Sci. agric. [online]. 1997, vol.54, n.3, pp. 167-173. ISSN 0103-9016.  http://dx.doi.org/10.1590/S0103-90161997000200009.

The 18O content of rain and river waters was used as an isotopic tracer in order to carry out the hydrograph separation of the Amazon river, during the 1973-1974 hydrological years, and to estimate the contributions of the surface runoff (event water) and baseflow (pre-event water) components to the total river flow. The average surface runoff and baseflow contributions were 30.3 and 69.7% respectively. At peak discharge, the mean contribution of the baseflow was about 57%. The results of the isotopic separation model were compared with the filter-separation autoregressive method, showing similar behavior and magnitude.

Keywords : isotopic tracers; hydrograph separation; Amazon river.

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