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Dans cet article le rseau de drainage est considr comme un go-indicateur de changements environnementaux qui se sont raliss durant 23 annes dans trois micro-bassins hydrographiques de ltat de Sao Paulo (Brsil). Les caractristiques du milieu physique ont t obtenues partir dune tude des diffrentes units gomorphologiques et des formations gologiques corrlatives. Afin de mettre en vidence les modifications...