2011
DOI: 10.25249/0375-7536.2011414566576
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Fluxo de sedimentos em suspensão nos rios da Amazônia

Abstract: Resumo A Bacia Amazônica se estende por mais de 6 10 6 km 2 , e aporta ao Oceano Atlântico um volume d'água da ordem de 6.600 10 9 m 3 .ano -1. Cerca de 50% da bacia corresponde aos terrenos pré-cambrianos dos escudos (Guianas e do Brasil Central), 12% à cadeia andina e o restante corresponde à planície fl uvial amazônica. Resultado da erosão dos Andes os sedimentos são transportados até o Oceano Atlântico através dos rios, principalmente. Estudos relativos a este tipo de estudo na Bacia Amazônica são raros, m… Show more

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Cited by 60 publications
(60 citation statements)
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References 20 publications
(19 reference statements)
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“…Another factor specifically related to dams is that sedimentation [10] will reduce the storage capacity of the reservoir, and diminish the capacity of the power plants to generate electricity. Finally, global climate change is predicted to diminish the average flow of the rivers in the southeast of the Amazon region (the location of most of the proposed dams) and will increase the variability of the flows [11].…”
Section: The Economics Of Irreversible Investmentsmentioning
confidence: 99%
“…Another factor specifically related to dams is that sedimentation [10] will reduce the storage capacity of the reservoir, and diminish the capacity of the power plants to generate electricity. Finally, global climate change is predicted to diminish the average flow of the rivers in the southeast of the Amazon region (the location of most of the proposed dams) and will increase the variability of the flows [11].…”
Section: The Economics Of Irreversible Investmentsmentioning
confidence: 99%
“…A estação hidrométrica de Óbidos situada no estado do Pará é considerada como sendo o ponto de referência mais a jusante que recebe as descargas dos rios Madeira, Solimões e Negro, além de que essa estação não sofre as influências da maré do Oceano Atlântico (Filizola et al, 2002) Figura 2 -Pontos de coleta elencados no sistema Madeira/Amazonas Os pontos de coleta foram georreferenciados e listados na Tabela 1. Os parâmetros pH, condutividade elétrica e turbidez foram mensurados in situ.…”
Section: Metodologiaunclassified
“…Entretanto, verifica-se um decréscimo acentuado nos valores de turbidez e STS rio abaixo. Entre os fatores que podem explicar a queda abrupta destes valores destaca-se a alta sinuosidade deste rio e contínua deposição da carga material em suspensão ao longo da planície de inundação (Queiroz et al, 2011;McClain & Naiman, 2008). Uma segunda hipótese que pode influenciar significativamente no decréscimo do material em suspensão rio abaixo é o fator de diluição.…”
Section: Metodologiaunclassified
“…The Andean mountains take up around 12% of the Amazonian land. Most of the sediment transported by the region's rivers originates from these mountains as a result of rapid erosion processes (Sioli, 1950(Sioli, , 1964Gibbs, 1967;Meade et al, 1985;Guyot et al, 1994;Filizola, 1999;Wittmann et al, 2011). The most important rivers, in terms of contributing sediment to the main river, are the Rio Solimoes (draining the Peruvian Andes and forming the main tributary of the Amazon in Brazil upstream of the Rio Negro confluence) and the Madeira River that drains in part the Andes, and in part the cratonic Brazilian Shields.…”
Section: The Amazon Basinmentioning
confidence: 99%
“…The Amazon Shelf SEDiment Study (AmasSeds) group, working with a 190 CTD Probe profiles at the continental shelf, indicated a total flux between 550 and 1,000 10 6 t yr -1 from the Amazon River into the ocean (Nittrouer et al, 1986a and. In the scope of the HiBAm (Hydrology and Geochemistry of the Amazon Basin) Project until 2001 when it was completed and after that until today with the ORE/HYBAM (Environmental Research Observatory on Amazon Basin Hydrology, Geochemistry and Geodynamics) Program, Guyot et al (1996), Filizola (1999, Filizola (2003), Filizola and Guyot (2004), Guyot et al (2005) and calculated the contributions from tributaries to the main stream during several cruises (HiBAm and ORE/HYBAM data) and using data from the Brazilian National Data set (from Brazilian Agência Nacional de Águas). They tested different kinds of sampling, data sources and calculation procedures.…”
mentioning
confidence: 99%