O presente trabalho tem, como objetivo, analisar o processo de sedimentação atual no Canal do Ararapira, Sistema Estuarino Lagunar de Cananéia-Iguape (SP), através das características composicionais e granulométricas dos sedimentos de fundo e distribuição da matéria orgânica sedimentar e carbonatos, relacionando estes parâmetros à configuração geral do canal e aos processos oceanográficos que ali atuam. Foram realizadas análises granulométricas, conteúdo de carbonato e matéria orgânica sedimentar (C, N, S) em 60 amostras de sedimentos coletadas em um cruzeiro oceanográfico realizado no mês de julho de 2004. Dentre o total de 60 amostras, foram selecionadas 16 para realização da análise da fração arenosa. A análise espacial da distribuição dos sedimentos e da matéria orgânica sedimentar, apontou para a predominância de sedimentos arenosos com baixos teores orgânicos ao longo de praticamente toda extensão do canal exceto em determinados pontos localizados no centro-norte do canal onde há presença de sedimentos finos associados a baixios e desembocaduras de gamboas e pequenos cursos d\'água continentais e insulares. Constatou-se a predominância da influência continental ao longo de todo o canal com pequenas concentrações de carbonatos. Os teores elementares da matéria orgânica sedimentar possuem, normalmente, comportamento e distribuição que estão diretamente relacionados aos tipos de sedimentos e à topografia de fundo, bem como à circulação. Observou-se uma relação direta entre os sedimentos mais finos e um maior conteúdo de matéria orgânica. / The aim of this study is the analysis of modern sedimentary process taking place in the Ararapira Channel, at Cananéia-Iguape lagoonal estuarine system (SP). The employed parameters for this were the composition and grain size characteristics of the bottom sediments , the distribution of the carbonates , organic matter, and relates these parameters to the general configuration of the channel and to the oceanographic process that takes place over there. The grain size analysis, the carbonate content, and the sediment organic matter (C, N, S) were conducted over 60 sediment samples collected during an oceanographic cruise that took place in July 2004. Among the total of the 60 samples, 16 were selected for the coarse fraction analysis. The spatial analysis of the distribution of sediments and sedimentary organic matter showed that sandy sediments, with low organic content, are predominant practically all along the whole of the channel extension, except in points located in the central-northern portion of the channel, where there are thin sediment associated to shoals or small continental and insular river courses. The C, N, S and carbonates contents observed with the coarse fraction analysis, allow identifying the predominance of continental influence all along the channel, with lower carbonate concentrations. The sediment organic matter contents have, usually, behavior and distribution which are directly related to the type of sediment ,to the bottom topography, as well as to the circulation. It was possible to observe a direct relationship between the thin sediment and a larger content of the organic matter.

O presente trabalho tem, como objetivo, analisar o processo de sedimentação atual no Canal do Ararapira, Sistema Estuarino Lagunar de Cananéia-Iguape (SP), através das características composicionais e granulométricas dos sedimentos de fundo e distribuição da matéria orgânica sedimentar e carbonatos, relacionando estes parâmetros à configuração geral do canal e aos processos oceanográficos que ali atuam. Foram realizadas análises granulométricas, conteúdo de carbonato e matéria orgânica sedimentar (C, N, S) em 60 amostras de sedimentos coletadas em um cruzeiro oceanográfico realizado no mês de julho de 2004. Dentre o total de 60 amostras, foram selecionadas 16 para realização da análise da fração arenosa. A análise espacial da distribuição dos sedimentos e da matéria orgânica sedimentar, apontou para a predominância de sedimentos arenosos com baixos teores orgânicos ao longo de praticamente toda extensão do canal exceto em determinados pontos localizados no centro-norte do canal onde há presença de sedimentos finos associados a baixios e desembocaduras de gamboas e pequenos cursos d\'água continentais e insulares. Constatou-se a predominância da influência continental ao longo de todo o canal com pequenas concentrações de carbonatos. Os teores elementares da matéria orgânica sedimentar possuem, normalmente, comportamento e distribuição que estão diretamente relacionados aos tipos de sedimentos e à topografia de fundo, bem como à circulação. Observou-se uma relação direta entre os sedimentos mais finos e um maior conteúdo de matéria orgânica. / The aim of this study is the analysis of modern sedimentary process taking place in the Ararapira Channel, at Cananéia-Iguape lagoonal estuarine system (SP). The employed parameters for this were the composition and grain size characteristics of the bottom sediments , the distribution of the carbonates , organic matter, and relates these parameters to the general configuration of the channel and to the oceanographic process that takes place over there. The grain size analysis, the carbonate content, and the sediment organic matter (C, N, S) were conducted over 60 sediment samples collected during an oceanographic cruise that took place in July 2004. Among the total of the 60 samples, 16 were selected for the coarse fraction analysis. The spatial analysis of the distribution of sediments and sedimentary organic matter showed that sandy sediments, with low organic content, are predominant practically all along the whole of the channel extension, except in points located in the central-northern portion of the channel, where there are thin sediment associated to shoals or small continental and insular river courses. The C, N, S and carbonates contents observed with the coarse fraction analysis, allow identifying the predominance of continental influence all along the channel, with lower carbonate concentrations. The sediment organic matter contents have, usually, behavior and distribution which are directly related to the type of sediment ,to the bottom topography, as well as to the circulation. It was possible to observe a direct relationship between the thin sediment and a larger content of the organic matter.

Four different trials of stratified three-layered fine paper, of sulphate pulp, were performed to investigate if stratified fine fraction or fibres from birch can improve the properties of a paper compared to a reference sheet. All trials had five different scenarios and each scenario was calendered with different linear load. All sheets had a grammage of 80 g/m2.In the first trial, the paper contained birch, pine and filler of calciumcarbonate (marble), and was manufactured with the pilot paper machine XPM and the stratified headbox Formator at RCF (Stora Enso Research Center in Falun). The furnish consisted of 75% birch and 25% pine.The second trial contained coated sheets with paper from trial one as the base paper. The coating slip contained calciumcarbonate and clay and the amount was approximately 10-12 g/m2.The third trial, also with birch and pine but without filler, was performed at STFI (Skogsindustrins Tekniska Forskningsinstitut in Stockholm) with the laboratory scaled paper machine StratEx and the stratified headbox AQ-vanes. The furnish consisted of 75% birch and 25% pine, except for one scenario which contained of 75% pine and 25% birch.The last trial contained fractionated pulp of birch and pine and was performed at STFI. 50% was fine fraction and 50% was coarse fraction.This test does not show any clear benefits of making stratified sheets of birch and pine when it comes to properties such as bending stiffness, tensile index and surface smoothness. The retention can be improved with birch in the surface plies. It is possible that the formation can be improved with birch in the surface plies and pine in the middle ply. It is also possible that fine fraction in the surface plies and coarse fraction in the middle ply can improve both surface smoothness and bending stiffness. The results in this test are shown with confidence intervals which points out the difficulties of analysing sheets manufactured with a pilot paper machine or a laboratory scaled paper machine.