JOAO DE OLIVEIRA
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Artigo IPEN-doc 10668 Determinacao de isotopos naturais de Ra em amostras costeiras da regiao de Itamaraca (PE)2005 - SILVEIRA, P.B.; VALENTIM, E.; LIMA, R.A.; MEDEIROS, C.; OLIVEIRA, J.Artigo IPEN-doc 10674 Estudo da degradacao de BTX em agua do mar usando radiacao gama de cobalto-602005 - ALMEIDA, K.C.S.; OIKAWA, H.; OLIVEIRA, J.; DUARTE, C.L.Artigo IPEN-doc 10703 Determinacao do tempo de mistura de massas d'agua costeiras na Plataforma do Estado de Sao Paulo, utilizando-se isotopos naturais de Ra como tracadores2005 - OLIVEIRA, J.; BRAGA, E.S.; FURTADO, V.V.; CHARETTE, M.Artigo IPEN-doc 10705 Estudo da variacao sazonal das concentracoes de sup(222)Rn em amostras de agua do mar nas enseadas de Ubatuba, para a estimativa da descarga de aguas subterraneas2005 - OLIVEIRA, J.; LOPES, P.C.; BRAGA, E.S.; CHIOZZINI, V.G.Artigo IPEN-doc 17486 Aguas subterrâneas na avaliação de riscos ambientais e de saúde em Cananéia, Iguape e Ilha Comprida (SP)2011 - JESUS, S.C. de; OLIVEIRA, J.; BRAGA, E.S.Artigo IPEN-doc 14038 Isotope techniques for assessment of submarine groundwater discharge and coastal dynamics in Ubatuba coastal areas, Brazil2006 - OLIVEIRA, J.; ELISIO, A.C.R.; TEIXEIRA, W.E.; PERES, A.C.; BURNETT, W.C.; POVINEC, P.P.; SOMAYAJULU, B.L.K.; BRAGA, E.S.; FURTADO, V.V.Artigo IPEN-doc 11772 Quantifyning submarine groundwater discharge in the coastal zone via multiple methods2006 - BURNETT, W.C.; AGGARWAL, P.K.; AURELI, A.; BOKUNIEWICZ, H.; CABLE, J.E.; CHARETTE, M.A.; KONTAR, E.; KRUPA, S.; KULKARNI, K.M.; LOVELESS, A.; MOORE, W.S.; OBERDORFER, J.A.; OLIVEIRA, J.; OZYURT, N.; POVINEC, P.; PRIVITERA, A.M.G.; RAJAR, R.; RAMESSUR, R.T.; SCHOLTEN, J.; STIEGLITZ, T.; TANIGUCHI, M.; TURNER, J.V.Artigo IPEN-doc 11731 Degradation of petroleum hydrocarbons in seawater by ionizing radiation2006 - ALMEIDA, K.C.S.; OIKAWA, H.; OLIVEIRA, J.; DUARTE, C.L.Artigo IPEN-doc 11736 Seasonal variations of 222Rn and SGD fluxes to Ubatuba embayments, São Paulo2006 - OLIVEIRA, J.; COSTA, P.; BRAGA, E.S.We describe here an application of excess 222Rn to estimate submarine groundwater discharge in a series of small embayments of Ubatuba, São Paulo State, Brazil. Excess 222Rn inventories obtained in 11 vertical profiles varied from (3.3±1.1)·103 to (19±5)·103 dpm·m-2. The estimated total fluxes required to support the inventories varied from (0.6±0.2)·103 to (3.4±0.9)·103 dpm·m-2·d-1. Considering these results, the submarine groundwater discharge advective rates necessary to balance the sub-pycnocline fluxes calculated in Ubatuba embayments ranged from 0.06 to 1.9 cm·d-1. During the period of this investigation (from March/03 to May/2004), the highest 222Rn in excess inventories were observed late in the summer season (March). Taking into account all vertical profiles established, the relative variability was 67%. Although, if we consider only the fluxes determined in both Flamengo and Fortaleza embayments, the relative variation was 21%.