IEDA IRMA LAMAS CUNHA
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Artigo IPEN-doc 22663 A model of recent sedimentation in the Cananeia–Iguape estuary, Brazil2006 - SAITO, R.T.; FIGUEIRA, R.C.L.; TESSLER, M.G.; CUNHA, I.I.L.Coastal systems, in particular estuaries, are the first depositional environment to receive sediments transported by rivers to the coastal ocean. As a consequence of the geochemical processes involved, a part of the sediment may be deposited in the estuary and the remainder flows into the ocean, being transported and deposited under the influence of tides and maritime currents. This study was carried out in the Cananeia–Iguape estuary on the southern coast of São Paulo state, Brazil. The vertical distribution of 210Pb and 137Cs in sediments has been used as a tool for estimating the sedimentation rates in the coastal environment. Concentrations of 210Pb and 137Cs, as well as heavy metals (lead, zinc, copper) were determined in four sediment cores collected in the Cananeia–Iguape estuary. The estimated sedimentation rates were from 5.3 mm yr−1 to 12.7 mm yr−1. The highest sedimentation rate obtained for Valo Grande corresponds with an accelerated expansion of the sand and clay banks of the Mar Pequeno channel, a growth of the mangrove areas, and a decrease in the depth of the main channel of navigation, a fact that has been affecting the navigation in the area very seriously. The data obtained for the metals showed a sedimentary dynamics in agreement with that obtained in the studies of sedimentation rates, thus contributing to the understanding of the hydrodynamic mechanisms of the system.Resumo IPEN-doc 05096 Uso do tracador radioativo de sup(210)Pb para determinar taxas de sedimentacao1997 - SAITO, R.T.; CUNHA, I.I.L.; TESSLER, M.G.Artigo IPEN-doc 10804 sup(210)Pb and sup(137)Cs levels in marine sediment samples from the southeastern coast of Brazil, South Atlantic area2004 - FIGUEIRA, R.C.L.; TESSLER, M.G.; MAHIQUES, M.M.; ZANINI, K.; SAITO, R.T.; CUNHA, I.I.L.Artigo IPEN-doc 08787 Niveis de sup(210)Pb e sup(210)Po em aguas dos canais do Sistema Costeiro Cananeia-Iguape (Sao Paulo, Brasil)2002 - SAITO, R.T.; FIGUEIRA, R.C.L.; TESSLER, M.G.; CUNHA, I.I.L.Artigo IPEN-doc 08786 Ingestao de sup(210)Pb e sup(210)Po pelo consumo de peixes no Sistema Cananeia-Iguape, Sao Paulo, Brasil2002 - SAITO, R.T.; FIGUEIRA, R.C.L.; TESSLER, M.G.; CUNHA, I.I.L.Artigo IPEN-doc 08300 Sup(210)Pb and sup(137)Cs geochronologies in the Cananeia-Iguape Estuary (Sao Paulo, Brazil)2000 - SAITO, R.T.; FIGUEIRA, R.C.L.; TESSLER, M.G.; CUNHA, I.I.L.Artigo IPEN-doc 06320 Application of radiochemical methods and dispersion model in the study of environmental pollution in Brazil1997 - CUNHA, I.I.L.; FIGUEIRA, R.C.L.; SAITO, R.T.Artigo IPEN-doc 03893 Studies of natural and artificial radioactivity in brazilian marine samples1996 - CUNHA, I.I.L.; FIGUEIRA, R.C.L.; SAITO, R.T.Resumo IPEN-doc 14581 Sedimentation rate in the brazilian south coast Cananeia-Iguape Estuary1998 - SAITO, ROBERTO T.; CUNHA, IEDA I.L.; FIGUEIRA, R.C.L.Artigo IPEN-doc 14202 Radiation migration through clay liners at waste disposal sites2001 - BOSCOV, M.E.G.; CUNHA, IEDA I.L.; SAITO, ROBERTO T.