Paleocanais no megaleque do rio Taquari: mapeamento e signifcado geomorfológico

Carregando...
Imagem de Miniatura

Data

2011-03-01

Título da Revista

ISSN da Revista

Título de Volume

Editor

Resumo

This paper presents the results of the frst systematic mapping of the paleochannel network on the Taquari megafan (Pantanal, Brazil). We used remote sensing data collected by the ASTER sensor, which captures images with 15 m square pixels. A total of 34 scenes, acquired from 2001-2006, were used in the analysis. These data were processed using a decorrelation stretch technique in order to obtain a better visual identifcation of the paleochannels. The mapping procedure began with the overlay of a 1:50.000 IBGE articulation, in order to systematize the extraction of features and to reduce the subjectivity inherent to visual analysis methods. We mapped a total of 33,205 km of paleochannels. The density of these features is related to the relative ages of distinct geomorphological compartments, known as depositional lobes. The mapped features preserve avulsion events that occurred on the megafan. The results suggest that low-magnitude avulsions occur more frequently than larger events.

Descrição

Palavras-chave

Avulsion, Fuvial geomorphology, Pantanal wetland, Remote sensing

Como citar

Revista Brasileira de Geociencias, v. 41, n. 1, p. 37-43, 2011.