2024-07-222024-07-222024-06-21LIMA, Paula Gilyane da Silva. Caracterização granulométrica e subsídios para estudos de distribuição da matéria orgânica sedimentar de estuários amazônicos dominados por maré. Orientador: Nils Edvin Asp Neto. Coorientadora: Ariane Maria Marques da Silva. 2024. 38 f. Trabalho de Curso (Graduação em Ciências Naturais) – Faculdade de Ciências Naturais. Instituto de Estudos Costeiros, Campus Universitário de Bragança, Universidade Federal do Pará, Bragança-PA, 2024. Disponível em: https://bdm.ufpa.br/jspui/handle/prefix/7062. Acesso em: .https://bdm.ufpa.br/jspui/handle/prefix/7062Amazon estuaries are important in scientific, socio-environmental and ecological aspects, due to their unique characteristics, such as the macrotidal regime and strong tidal currents. Although estuaries act as efficient sediment traps, local rivers transport relatively small amounts of suspended sediment. Sediment transport processes in these estuaries are influenced especially by physical factors, such as river-ocean hydrodynamics. This work investigated the sedimentological aspects of three Amazonian estuaries: Mocajuba, Caeté and Gurupi, and also in the continental inner shelf area adjacent to these estuaries. Bottom surface sediment samples were collected throughout the study area. Subsequently, the samples were weighed, washed with water and treated with hydrogen peroxide to eliminate salts and quantify organic matter. The results revealed a predominance of sandy sediments in the samples collected on the Amazon Continental Shelf, being classified as well sorted. The samples collected in estuaries predominantly showed silty sediments. The distribution of sediments in the estuaries reflected the interaction between environmental factors, such as adjacent mangrove areas, in addition to the contribution of fine sediments from the Amazon River plume. Estuarine sediments were classified as poorly sorted, and this highlighted the complexity of transport and deposition processes. The asymmetric distribution of sediments in the samples provided additional understanding of the granulometric distribution, indicating the predominance of fine or coarse sediments in response to the dynamics of sediment transport and local conditions. Organic matter analysis provided insights into granulometry, especially related to muddy sediments. The results highlighted the importance of particle size and organic matter analysis in understanding sedimentary processes in Amazonian estuaries, providing crucial information for future studies on erosion, deposition and environmental impacts.Acesso Abertozona costeira amazônicadinâmica sedimentarsedimentologiaAmazon coastal zonesedimentary dynamicssedimentologyCNPQ::CIENCIAS EXATAS E DA TERRA::OCEANOGRAFIA::OCEANOGRAFIA GEOLOGICATrabalho de Curso - Graduação - Monografia