Geomorphological Evolution of River Forms in Humid and Semi -arid Tropical Environments

Author(s)

Valezio, Everton Vinicius ; Lima, Kleber Carvalho ; Perez Filho, Archimedes ; DosSantos, GB ; Felippe, MF ; Neto, RM

• Document type: Journal article
• Source: GEOMORPHOLOGY OF BRAZIL: COMPLEXITY, INTERSCALE AND LANDSCAPE; v. N/A, p. 15-pg., 2022-01-01.

Abstract

Fluvial channels are directly affected by changes triggered by natural and anthropic phenomena, adapting to new conditions in different temporal -spatial rhythms. In order to demonstrate how certain techniques can support the interpretation of the geomorphological evolution of tropical river systems, we selected two rivers in different climatic conditions: Jacare-Guacu (SP) in humid tropical regimes, and Itapicuru (BA) in semi -arid regime. By means of aerial photographs, orbital images, aerophotogrammetry by remotely piloted vehicle, description of the deposits, and absolute dating by Optically Stimulated Luminescence (OSL), it was verified that, even in distinct systems, the processes of formation of fluvial terraces were active in more humid conditions, however, in different periods, more current for Itapicuru and older for Jacare-Guacu, demonstrated by the morphology of the paleochannels and by the absolute dating. Thus, it is believed that the techniques used for the interpretation of the geomorphological evolution of river systems can improve the studies of landscape evolutionary models in line with considerations of the sensitivity of river systems to absorb, resist, or recover from disturbances in their own temporalities. (AU)

• FAPESP's process: 16/24390-0 - Geomorphological evolution of lower river terraces and abandoned meanders of an alluvial segment of the Jacaré-Guaçu river (São Paulo, Brazil)
• Grantee: Éverton Vinícius Valezio
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 12/00145-6 - Landscape evolution and geocronology of Depressão Periférica and Planalto Ocidental Paulista relief
• Grantee: Archimedes Perez Filho
• Support Opportunities: Regular Research Grants