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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Paleochannels on Taquari river megafan, Pantanal, Brazil: their mapping and geomorphological meaning

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Hiran Zani [1] ; Mario Luis Assine [2]
Total Authors: 2
[1] Instituto Nacional de Pesquisas Espaciais. Programa de Pós-graduação em Sensoriamento Remoto - Brasil
[2] Universidade Estadual Paulista. Instituto de Geociências e Ciências Exatas - Brasil
Total Affiliations: 2
Document type: Journal article
Source: BRAZILIAN JOURNAL OF GEOLOGY; v. 41, n. 1, p. 37-43, 2011-01-00.

Abstract: 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. (AU)

FAPESP's process: 06/02381-8 - Construction and abandonment of depositional lobes in sedimentary evolution of Taquari river megafan, Pantanal Mato-Grossense
Grantee:Hiran Zani
Support type: Scholarships in Brazil - Master