Data/hora: 07/06/2024 01:08:53

Biblioteca(s): | Embrapa Gado de Corte.
Data corrente: | 11/12/1998
Data da última atualização: | 15/01/2014
Autoria: | SOUZA, O. C. de.
Título: | Modern geomorphic processes along the Taquari river in the pantanal: a model for development of a humid tropical alluvial fam.
Ano de publicação: | 1998
Fonte/Imprenta: | Santa Barbara : University of California, 1998.
Páginas: | 135p.
Idioma: | Inglês
Notas: | CNPGC.
Conteúdo: | Wetland management within the alluvial fan for the  Taquari River in the Pantanal of Brazil requires understanding the channel-feomorphology. The alluvial fan of Taquari has an area of about 50,000km2, Analyses of hydrologic, geomorphic, grain size distribution, and remote sensing data allowed the development of a conceptual model that accounts for the identification of two distinct sections of the alluvial fan of the Taquari River, a meandering section and an anastromosing section. The meandering section is located in the region of the fan head. Temporal variability of discharge in this  reach is due to seasonality of precipitation. Channel and active floodplain are entrenched within walls of older terrace deposits. There is a predominance of coarse material (>0,063 mm) in the river, river margins, and  fllodplain. The anastromosing section begins at the intersection point of the fan approximately 100 km down the fan head. The unconfined character of the  floodplain in the distral region of the fan is due to lower bank heights and progressive descrease of floodplain elevation in relation to river water level. Decreasing downstrean discharge is due to overbank flow. The decrease in suspended sediment concentration downstrean reveals  that  almost all the sediment load is deposited along the distal region of the alluvial fan. Decreasing grain size within sediments of  the river, margins, and floodplain indicates that fine material is deposited in the fllodplain, while coarse material remains within the channels. Spectral mixture analysis of Landsat TM imagery, usiing sediment-laden water, clear water and vegetation revealed changes in the hydrological  behavior of the Taquari River as enlarging floodplain area in the distral fan.
Palavras-Chave: | Alluvial fan; Brasil; Leque aluvial; Model; Modelo; Rio Taquari; Taquari River.
Thesagro: | Geomorfologia; Hidrologia; Sensoriamento Remoto.
Thesaurus Nal: | Brazil; geomorphology; hydrology; Pantanal; remote sensing.
Categoria do assunto: | --
Registro original: | Embrapa Gado de Corte (CNPGC)
Exemplares: | CNPGC - (5998-1) - ADD - TS - PP - T920/98 - SOU - T920/98 - DIS