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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Applying SRTM digital elevation model to unravel Quaternary drainage in forested areas of Northeastern Amazonia

Texto completo
Mantelli, Luiz Rogerio [1] ; Rossetti, Dilce de Fatima [1] ; Albuquerque, Paulo Gurgel [1] ; Valeriano, Marcio de Morisson [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Inst Nacl Pesquisas Espaciais, BR-12245970 Sao Jose Dos Campos, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Computers & Geosciences; v. 35, n. 12, p. 2331-2337, DEC 2009.
Citações Web of Science: 18

There has been an increasing number of articles stressing the advantage of applying remote sensing products of synthetic aperture radar (SAR) and interferometric synthetic aperture radar (InSAR) for rapidly enhancing the volume of geological data in Amazonian areas, where forest cover is dense and high, clouds are abundant and accessibility is limited. The majority of these studies has emphasized geomorphology as a tool for both discussing tectonic reactivations during the Cenozoic and reconstructing Quaternary paleolandscapes. This work applies Digital Elevation Model (DEM) derived from the Shuttle Radar Topography Mission (SRTM) for delineating past morphological features under dense rainforest in an Amazonian lowland area. Previous use of this tool in southwestern Marajo Island (northern Brazil) helped to delineate, with exceptional precision, a paleochannel network hidden under the rainforest, which would be barely detected with other available remote sensing products. Fieldwork revealed that these paleochannels are related to palimpsest drainage systems developed mostly during the last 40,000 (14)C yr B.P. Measured altitudes acquired during topographic surveys attested that paleochannel areas are slightly higher than adjacent floodplains. This fact determined the successful application of SRTM-DEM for mapping paleochannels in Marajo Island. Integration of SRTM data with sedimentological information collected during fieldwork suggests paleoflows derived from continental areas located to south of the study area. This paleodrainage was active when the island was still connected to mainland. With island detachment due to reactivation of tectonic faults, the channels became abandoned and were progressively forested. The results obtained in the present study indicate that SRTM-DEM has high potential for unraveling similar morphological features from many other Amazonian areas with low topography and a dense forest cover. (C) 2009 Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 04/15518-6 - Integração de dados biológicos e geológicos no Baixo Tocantins-Ilha do Marajó: chave na análise da biodiversidade
Beneficiário:Dilce de Fátima Rossetti
Linha de fomento: Auxílio à Pesquisa - Regular