Mestrado em Oceanografia Ambiental
URI Permanente para esta coleção
Nível: Mestrado Acadêmico
Ano de início: 2007
Conceito atual na CAPES: 4
Ato normativo: Homologado pelo CNE(Portaria MEC Nº 609 de 14/03/2019) Publicação no DOU em 18/03/2019 Seç. 1, Pág. 63. Parecer CNE/CES nº 487/2018, Processo no 23001.000335/2018-51).
Periodicidade de seleção: Anual
Área(s) de concentração: Sistemas Costeiros e Marinhos
Url do curso: https://oceanografia.ufes.br/pt-br/pos-graduacao/PPGOA/detalhes-do-curso?id=1468
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Navegando Mestrado em Oceanografia Ambiental por Autor "Ayres Neto, Arthur"
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- ItemAnálise da resposta acústica em sedimentos marinhos(Universidade Federal do Espírito Santo, 2014-04-13) Menandro, Pedro Smith; Quaresma, Valéria da Silva; Bastos, Alex Cardoso; Ghisolfi, Renato David; Ayres Neto, ArthurSubmarine geoacoustics helps in understanding the behavior of propagation and attenuation of sound in sediment, providing an information set which assists the major data interpretation approaches. The detection of muddy deposit through high resolution acoustic records is generally easy, usually appearing as free reflection layers. However, this acoustic response depends on the frequency used and other characteristics of the deposit, even of the water column. The dynamics of these muddy layers may have influence in many areas, from engineering and harbor maintenance, to biology and studies of impact on benthic biota. The development of a rapid and efficient mapping method for these deposits seems to be a demand for knowledge advance of the processes involved in the transport, deposition and suspension. Thus, this study has two main approaches divided into two independent studies: i) investigate how the acoustic signal response from different sources changes with the frequency and sediment physical properties (grain size and density), and ii) associate variations observed in the acoustic records with sediment mobility over a tidal cycle. The dataset consists of high-frequency geophysical records ( 3.5, 33 and 210 kHz ) , sediment physical properties, in situ density , hydrodynamics and distribution of suspended particulate matter, which were collected at the North Channel of Amazon River . The first chapter showed that different survey methods at the same area can provide different results. Furthermore, the frequency and density were important properties to understand the relationship between surface sediment and acoustic features. The second chapter was an attempt to evaluate sediment dynamics through acoustic system, and showed that the changes in the processes of sediment transport were recognized by the ADCP and OBS allowing to distinguish the acoustic echo sounder records and to interpret sedimentary dynamic processes.
- ItemEcocaráteres e processos sedimentares na plataforma continental adjacente à desembocadura do Rio Doce (ES)(Universidade Federal do Espírito Santo, 2014-03-13) Boni, Geandré Carlos; Quaresma, Valéria da Silva; Ayres Neto, Arthur; Barroso, Gilberto FonsecaThe continental shelf close to the Doce river mouth, environment relatively preserved and possibly subject to future changes and/or anthropogenic interventions, was studied about yours echo-characters and sedimentary processes associated. High resolution data from sub-bottom profiling (3.5 KHz) were collected along 400 Km. Particle size and content of Calcium Carbonate were obtained of superficial sediments samples, and the results submitted to clustering and ACP statistical analyses. Good correlation was observed between the five sedimentary clusters and echo-characters. The echo-character A1 (penetration absent) were been restricted to deepest regions (35-80 m.) indicating marine sedimentary domains, associated to biogenic sedimentation (sandy to muddy-gravely-sandy bottom). A transitional/marine region (25-35 & 55-80 m.), with mixed sedimentary processes (sandy bottom), was indicated by the echo-character A2 (indistinct reflectors). The echo-character B (many distinct, parallel to each other and to the seabed reflectors) were been associated to higher levels of sediments consolidation (gravelly-muddy sandy bottom), reflecting riverine/coastal domains related to extremely environmental conditions (high river discharge with strong and constant N/NE trade winds). The echo-characters C1 and C2 (semitransparent layers with different resolutions) were distributed by the same sedimentary domain (but between 10 and 30 m.), in sandy-muddy to muddy-sandy deposits. Regular terrigenous sedimentation (constant supply and lower sediments consolidation) was associated to the echo-character C2 (shallowest and closest to the river mouth). The echo-character C1 indicated irregular terrigenous sedimentation and higher sediments consolidations, being associated to the action of cold fronts, for example.
- ItemHeterogeneidade de fundo de rodolitos expressa em dados de backscatter(Universidade Federal do Espírito Santo, 2019-03-25) Rocha, Gabriella Aleixo; Bastos, Alex Cardoso; Vital, Helenice; Ayres Neto, ArthurThis study aims at showing the potential of acoustic backscatter mosaic obtained from Multibeam Sonar System (MBSS) to map the cover variation of calcareous algaes nodules along rhodolith beds. Many studies have previously acoustically identified rhodolith beds. However, to verify quantitatively the rhodolith density using MBSS backscatter is a new approach. High-resolution MBSS data were acquired on April 2018, in the Marine Protection Area (MPA) Costas das Algas, located in the Espírito Santo continental shelf. Three areas were selected based on preterit data, totalizing 73km² of data acquisition. The MBSS data were processed on Caris Hips and Sips 9.1.7 software, and three georeferenced backscatter mosaics were created. On June 2018, 80 videos of the seafloor were collected in the areas. These videos were analyzed on the Coral Point Count with Excel Extension Software and used to provide the seafloor type and the percentage of different substrates in each station. The data were segmented into classes based on backscatter intensity variation and ground truth information. As a final result, we identified three classes related to rhodolith in different density: low rhodolith coverage (inferior to 25% of rhodolith), moderate rhodolith coverage (between 25% and 35% of rhodolith), and high rhodolith coverage (greater than 35%). Classes associated with unconsolidated sediment, bioconcretions and red algae genus peyssonelias were also identified. The methodology used in this work is an efficacious tool to map benthic habitats and to detail nodules distribution across a rhodolith bed. It can be used to improve spatial management of marine systems, to monitor and protect vulnerable marine ecosystems.