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Landscape changes in avulsive river systems: Case study of Taquari River on Brazilian Pantanal wetlands

Texto completo
Louzada, Romullo O. [1] ; Bergier, Ivan [2, 1] ; Assine, Mario L. [3]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Fed Mato Grosso do Sul, Programa Posgrad Recursos Nat, Campo Grande, MS - Brazil
[2] Embrapa Pantanal, Corumba, MS - Brazil
[3] UNESP Univ Estadual Paulista, Inst Geociencias & Ciencias Exatas, Rio Claro, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Science of The Total Environment; v. 723, JUN 25 2020.
Citações Web of Science: 0

The Pantanal is an important active sedimentary basin in central South America where highly diverse flora and fauna are sustained by seasonal floods. Intense land use in the catchment areas enhanced sediment load and destabilized avulsive river systems in the plains. A well-known avulsion in the Taquari River during the 1980-90s, called ``Ze da Costa{''}, has shifted the river mouth and drastically changed the nearby landscapes, making them difficult to map because of the hard access and the large variations in spectral and spatial attributes of raster data like Landsat images. Therefore, we developed a useful method to map and explore landscape changes in ``Ze da Costa{''} avulsion that combines geotagged field pictures, randomly selected high-resolution orbital truths, normalized difference vegetation index, digital elevation models, linear spectral mixture models and Landsat historical imagery in pixel-based and object-oriented supervised classifications. We found that bands in green, red, and near-infrared spectra provide better mapping results with object-oriented algorithms for deriving and studying temporal dry/wet ratio dynamics. The temporal analyses of the dry/wet ratio showed that avulsions in the Taquari River have the potential to change permanently the ``Ze da Costa{''} area into a dry landscape, making it susceptible for land use (deforestation and fire), except areas seasonally inundated by the floods of the Paraguay River. Overall, our method might be also useful for long-term studies of land use and climate change in avulsive rivers in wetlands around the world. (C) 2020 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 14/06889-2 - Mudanças paleo-hidrológicas, cronologia de eventos e dinâmica sedimentar no quaternário da Bacia do Pantanal
Beneficiário:Mario Luis Assine
Linha de fomento: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular