Data/hora: 16/06/2024 17:16:35

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 15/07/1999
Data da última atualização: | 28/03/2017
Autoria: | HAMILTON, S. K.
Afiliação: | W.K. Kellog Biological Station and Departaments of Zoology and Geological Sciences, Michigan State University.
Título: | Potential effects of a major navigation project (Paraguay - Parana) on inundation in the Pantanal floodplains.
Ano de publicação: | 1999
Fonte/Imprenta: | Research and Management, v.15, n.4, p.289-298, 1999.
Idioma: | Inglês
Conteúdo: | The Pantanal wetland of Brazil, a vast complex of seasonally inundated floodplains along the Paraguay River, is renowned for its outstanding biological resources. A proposed navigation project known as the Paraguay-Parana. Waterway (or Hidrovia) would deepen the Paraguay River channel to facilitate year-round navigation throught the Pantanal. The possibility of decrease in river levels (stage) has aroused concerns in relation to  the potential environmental impacts, however the poor understanding of the hydrological relationships between rivers and floodplains has hampered evaluation of these impacts. The present study evaluates the potential impact of river modification on adjacent floodplains by examining the relationship between the Paraguay River stage and the extent of floodplain inundation. Satellite observations of flooded area (from passive microwave emission; mobthly data for 1979-1987) are plotted against river stage from several stations throught the region to show the stage-inundation relationships for eight subregions along the Paraguay River. Scenarios in which the Paraguay River stage is decreased from the 20th and 80th percentile values reveal large potential impacts on inundation. For stage decreases of 0.10 and 0.25 m, the total flooded area is reduced by 1430 and 3830 km2 at low-water, and by 2410 and 5790 km2 at high-water, respectively. The floodplains of the two northrnmost subregions appear to be most susceptible to reductions in flooding, losing more than half flooded area with a 0.25-m decrease in the low-water stage. The ecological impacts of these reductions in flooded area may be particularly severe at low water, when the few areas that typically remain flooded throughout the dry serve as important refuges for aquatic animals. These results underscore the need for understanding of the hydrology of the integrated river floodplain systems in the Pantanal before river channel modification are carried out.
Palavras-Chave: | Area alagada; Brasil; Hidrovia Paraguai-Parana; Inundation; Navigation.
Thesagro: | Inundação; Navegação.
Thesaurus Nal: | Brazil; Pantanal; wetlands.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (40669-1) - ADD - SP - PP - SP16003 -  - 16003 - DIS