Data/hora: 14/06/2024 00:14:03

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 13/02/2020
Data da última atualização: | 17/04/2020
Autoria: | LOUZADA, R. O.; BERGIER, I.; ASSINE, M. L.
Afiliação: | RÔMULLO O. LOUZADA, Universidade Federal de Mato Grosso do Sul; IVAN BERGIER TAVARES DE LIMA, CPAP; MARIO L. ASSINE, Universidade Estadual Paulista, Rio Claro.
Título: | Landscape changes in avulsive river systems: case study of Taquari River on Brazilian Pantanal wetlands.
Ano de publicação: | 2020
Fonte/Imprenta: | Science of the Total Environment, v. 723, 138067, p. 1-12, 2020.
DOI: | https://doi.org/10.1016/j.scitotenv.2020.138067
Idioma: | Inglês
Conteúdo: | 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 'Zé 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 'Zé 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 'Zé 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.
Thesagro: | Inundação; Mudança Climática; Rio; Sensoriamento Remoto.
Thesaurus Nal: | Climate change; Landscape ecology; Remote sensing; River water; Temporal variation.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (60520-1) - UPC - AP - DD -  -  -  - DIS