Chemical and mechanical erosion in the Niger and Amazon basins: climatic and paleoclimatic evolution of tropical landscapes

The annual hydrograph separation of the upper Niger basin at Bamako, determined from the TDS and TSS concentration variations in the river waters during the dry period 1990-1992, has been extrapolated to climatic cycles from arid to perhumid. A dilution factor (F=rainfall/runoff) is introduced, so t...

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Published inComptes rendus de l'Académie des sciences. Série II. Fascicule a, Sciences de la terre et des planètes Vol. 326; no. 9; pp. 625 - 632
Main Authors Boeglin, Jean-Loup, Roquin, Claude, Mortatti, Jefferson, Tardy, Yves
Format Journal Article
LanguageEnglish
Published 01.05.1998
Subjects
Niger River, Africa
Amazon River, South America
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Summary:The annual hydrograph separation of the upper Niger basin at Bamako, determined from the TDS and TSS concentration variations in the river waters during the dry period 1990-1992, has been extrapolated to climatic cycles from arid to perhumid. A dilution factor (F=rainfall/runoff) is introduced, so that the extrapolation from the Niger basin data corresponds to the weathering parameters which characterize, in very humid environments, three tributaries of the Amazon. The erosion rates of tropical landscapes submitted for 150 Myr are finally reconstituted to major paleoclimatic oscillations.
Bibliography:ObjectType-Article-2
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ISSN:1251-8050
DOI:10.1016/S1251-8050(98)80253-X