Dissertações em Geofísica (Mestrado) - CPGF/IG
URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/4993
O Mestrado Acadêmico pertente a o Programa de Pós-Graduação em Geofísica (CPGF) do Instituto de Geociências (IG) da Universidade Federal do Pará (UFPA).
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Navegando Dissertações em Geofísica (Mestrado) - CPGF/IG por Orientadores "LUIZ, José Gouvêa"
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Item Acesso aberto (Open Access) Análise de feições geológicas na região de Tartarugalzinho, Amapá, através de métodos geofísicos(Universidade Federal do Pará, 2009) MARTINS, Saulo Siqueira; PINHEIRO, Roberto Vizeu Lima; http://lattes.cnpq.br/3251836412904734; LUIZ, José Gouvêa; http://lattes.cnpq.br/8676530374310847Two geophysical methods were applied to detect geologic structures on the oriental edge of the Guianas Shield. The gravimetric method was applied mainly to find faulting on the basement, associated to shear belts that have orientation NW-SE. It was found faulting on the basement as well as an indication that the crust suffered a thinning in some region of the edge. The GPR electromagnetic method was applied to find geologic discontinuities on the sediments and to check if they are reflex of structural faults on the basement and/or reactivation of some of them. The GPR showed places where discontinues and some paleostructures can be observed. The study was also applied to understand how the basement discontinuities can influence on the formation of Tertiary sedimentary basins and on the formation of shallow paleostructures.Item Acesso aberto (Open Access) Aplicação dos métodos geofísicos elétrico e eletromagnético na determinação de unidades sedimentares costeiras tropicais em Bragança, Nordeste do Pará(Universidade Federal do Pará, 2002-02-25) SILVA, Regina Célia dos Santos; LUIZ, José Gouvêa; http://lattes.cnpq.br/8676530374310847This thesis shows the application of geophysical methodology on several deposition environments of the Planície Costeira Bragantina (Bragantina Coastal Plain), which are being studied in the Mangrove Dynamics and Management (MADAM) Project. The aim of the work was to test geophysics on coastal deposition environment to help the geological understanding of the recent stratigraphic evolution of the Bragantina Coastal Plain. Geophysical measurements were carried out on several morpho-stratigraphic geological units using: (a) the conventional dc resistivity method, through Schlumberger vertical sounding, and (b) the slingram horizontal loop electromagnetic method, with measurements taken for eight frequencies. Vertical electric soundings allowed to know the resistivity distribution in subsurface. The resistivity models could be correlated to geology, but the results were not satisfactory for the depth of investigation as a result of the environment high condutivity. The electromagmetic method was easier and quicker to apply than the resistivity method. Electromagnetic data were analized in profiles and in electromagnetic soudings. The data allowed to stablish geological contacts and geophysical signatures for the coastal deposits of the area.Item Acesso aberto (Open Access) Caracterização geoelétrica da área de curtume localizado no Distrito Industrial de Icoaraci, Belém-Pará(Universidade Federal do Pará, 2005-11-28) NUNES, Lana Patrícia Martins; LUIZ, José Gouvêa; http://lattes.cnpq.br/8676530374310847A study covering the shallow subsurface was developed in order to investigate the possibility of underground contamination by liquids used in the treatment of animal skin. The study was carried out inside the area of the Couro do Norte industry, located in the Icoaraci Industrial District (Belém – Pará). During the study they were made measures for the determination of the flow of water of the first aquifer and applied geophysical methodology with the purpose of detecting the possible contamination of the underground for pollutant liberated by the tanning. The geophysical methodology applied was: resistivity (imaging and vertical electric soundings), spontaneous potential, electromagnetic (Slingram) and ground penetrating radar (GPR). Analyses of electromagnetic data lead to the identification of conductive zones (Contamination) and resistive zones (sandy material). Spontaneous potential gave information on the direction of local underground flow of water. Vertical electric soundings allowed to know the resistivity distribution in subsurface. The resistivity sounding models could be correlated to the electrical images obtained in electrical profiling. Through the GPR data was possible to identify the presence of lateritic blocks, metal piping and zones with high attenuation (shadow zones) that indicate the presence of contamination.Item Acesso aberto (Open Access) Estimativas de umidade no solo usando GPR(Universidade Federal do Pará, 2011) MESQUITA, Marcelo Jorge Luz; LUIZ, José Gouvêa; http://lattes.cnpq.br/8676530374310847This work aims to analyze the effectiveness of GPR (Ground Penetrating Radar) as a measure of moisture in comparison to the established system TDR (Time Domain Reflectometry) and introduce changes in the calibration equations that allow estimation of the moisture from the wave velocity of the GPR. This work presents the methodologies for collecting and processing the GPR data, aimed at determining the moisture. One of the methods was applied in Cuiarana (Salinópolis - PA) with 400 MHz antenna and compared with data from TDR. The relative permittivity obtained by means of the velocities of the waves of GPR were used to infer the values of moisture from Topp and Roth's equations and thus to compare them to the values obtained with TDR. The data were statistically correlated and analyzed, enabling the establishment of a new calibration equation as a function of relative permittivity and other in terms of the speed of the GPR wave. The study successfully showed the feasibility and limitations of estimating water content with GPR.Item Acesso aberto (Open Access) Estudo da contaminação por hidrocarbonetos em postos de serviços de Abaetetuba-PA utilizando georadar(Universidade Federal do Pará, 2007) ALMEIDA, Fabíola Magalhães de; LUIZ, José Gouvêa; http://lattes.cnpq.br/8676530374310847The work presents the results of a geophysical survey using the Ground Penetrating Radar (GPR) method to detect possible zones of contamination caused by derivatives of hydrocarbons in service stations of the urban region of the city of Abaetetuba, in the state of Pará. The methodology was applied in service stations because they are the main potential source of soil and ground water contamination by fuel in the cities. Basic concepts about oil and contamination and its interaction with the ground are presented, together with the basic principles that allow the understanding of the GPR method as applied to the addressed problem. During the work, the depth to the water table was measured to construct an underground flow map. The geophysical interpretation was assisted by the knowledge of the local underground water flow that gives indication on the direction of contamination movement. The correlation of the GPR data with the underground flow and the information about the stations history allowed to classify them as suspected of producing contamination and possibly contaminated.Item Acesso aberto (Open Access) Estudo geofísico para a caracterização geológica e hidrogeológica da subsuperfície rasa em área de deposição de rejeitos sólidos no município de Barcarena-PA(Universidade Federal do Pará, 2002) NEVES, Ana Paula Vilas Boas; LUIZ, José Gouvêa; http://lattes.cnpq.br/8676530374310847This geophysical study was carried out in the ALBRAS Solid Refuse Deposition Area located in Barcarena, State of Pará. The results allowed to characterize the subsurface, giving information on the geological layers and hidrogeological parameters like direction and velocity of underground flow. Three geophysical methods were used in the study: Spontaneous potential, dc-resistivity, and electromagnetic (slingram). During the study, an experiment of infiltration of salty water in the ground was performed and monitored through electrical imaging. Spontaneous potential gave information on the direction of local underground flow of water. Electrical imaging allowed to estimate the velocity and the direction of underground flow along the imaging profile. The models obtained from the inversion of vertical electrical sounding apparent resistivity data showed a good correlation with gamma ray logging run in wells in the studied area. The interpreted resitivity and thickness of the models provided detailing for the shallow lithological units. Analysis of electromagnetic data on profiles, soundings, and contouring maps lead to the identification of conductive zones (clayed material) and resistive zones (sandy material). Besides, a good correlation among 14080 Hz electromagnetic contouring map and spontaneous potential map was observed.Item Acesso aberto (Open Access) Geofísica aplicada à Arqueologia: investigação no Sítio Histórico Engenho Murutucu, em Belém, Pará(Universidade Federal do Pará, 2007-08-21) MELO, Marina da Silveira e; LUIZ, José Gouvêa; http://lattes.cnpq.br/8676530374310847This research sought through geophysical methodology the indication of possible locations of buried remains of occupation and foundations of the old construction of a slave quarter in the Engenho Murutucu, a historical site that has importance and relevance for the history of Pará. Following a magnetic map constructed with data from a previous research, 26 GPR profiles were carried out in the area using a 400 MHz antenna. The investigated depth in the GPR profiles was around 1,75 m. The analysis and correlation of the magnetic and GPR data allowed to reach the purpose of the research. The resulting geophysical indications will guide the future archaeological interventions in the site.Item Acesso aberto (Open Access) GPR aplicado à arqueologia nas áreas do porto da Cargill (Santarém/PA) e no Palacete Faciola (Belém/PA)(Universidade Federal do Pará, 2012) SOUZA, Danusa Mayara de; LUIZ, José Gouvêa; http://lattes.cnpq.br/8676530374310847This study was conducted in two areas. The first, located at the backyard of the Palacete Faciola, Belém/PA and, the second, named 4A, in the Archaeological Site PA-ST-42, located at the Port of Santarém/PA. The geophysical survey described in this work was undertaken in order to assist in archaeological prospecting, indicating places for future excavations in order to detect structures and/or artifacts buried on the sites. The radargrams acquired in both areas showed several anomalous features. Until the finish of this work any excavation had been undertaken in Palacete Faciola. In 4A area, however, two trenches were opened revealing various archaeological fragments.Item Acesso aberto (Open Access) Identificação de ambientes de sedimentação na Área Metropolitana de Belém a partir de perfis de poço(Universidade Federal do Pará, 2003-06-30) NASCIMENTO, Márcia Helena D'Oliveira; LUIZ, José Gouvêa; http://lattes.cnpq.br/8676530374310847This thesis presents a study based on patterns related to the shape of logging curves obtained in groundwater wells drilled in Belém metropolitan area. The objective of the study was to recognize Cenozoic sedimentation sequences and their sedimentation environment. Single point resistance, spontaneous potential and gamma ray logging from 21 wells were analyzed, covering maximum depth of 300 m. The study allowed to recognize two main units: one of them, characterized by large amount of clays and thin sand layers, occurring between surface and 160 m depth, while the other, below 160 m, presents thick sandy layers. These units were associated to the sedimentary sequences of Lower Cenozoic described by Rossetti (2000) that correlate to Pirabas and Barreiras Formations, and to Post-Barreiras and Holocenic sediments. For the upper unit, the shape of the logging curves show patterns that can be associated to transgression and regression, while for the lower unit the shape of the curves suggest a center of channel sedimentation. The study shows that the methodology used to recognize sedimentation environment can be considered satisfactory if no a priori geological information is available.Item Acesso aberto (Open Access) Implantação do campo de testes da UFPA para medidas geofísicas(Universidade Federal do Pará, 2013) ALVES, Jerry Williamis Lima; LUIZ, José Gouvêa; http://lattes.cnpq.br/8676530374310847We describe the results obtained during the implementation of the Federal University of Pará test site for geophysical measurements. The work was done in three stages. In the first stage, preliminary studies were accomplished to know the physical background of the area. In the second, artifacts were buried to simulate geophysical anomalies in the measurements. In the third one, new measures were performed to detect anomalies caused by the buried artifacts. Only a part of the artifacts that are scheduled for burial was buried in the site. The buried artifacts are metal pipes, metal drums, and plastic drums. The measures implemented in the first and third stages involved the methods of Electrical Resistivity, Ground Penetrating Radar (GPR), Electromagnetic and Magnetic. The measurements performed in the third stage showed the presence of artifacts in the actual position where they were buried, which turns the area suitable to serve as a training site for geophysical experimental practices.Item Acesso aberto (Open Access) Metodologia geofísica aplicada à pesquisa de salvamento arqueológico nos sítios Bittencourt, Jambuaçu e Jaburu, Estado do Pará(Universidade Federal do Pará, 2006-05-02) ARAGÃO, Rigler da Costa; LUIZ, José Gouvêa; http://lattes.cnpq.br/8676530374310847We present the results obtained in the application of geophysical methods to help the archaeological rescue of remains in the three following sites in Pará, northern of Brazil: Bittencourt, located in Abaetetuba; Jambuaçu, located in Moju; and Jaburu, located in Almeirim. Magnetometry, scintillometry and ground penetrating radar (GPR) were used in the study. Magnetic measurements were taken as the main tool to indicate places for excavation. GPR was used to confirm the anomalies detected with the magnetic method and provided a restriction to the magnetic anomalies caused by non-archaeological artifacts. Scintillometry was used as an attempt to map the archaeological black earth (ABE) or Terra Preta Arqueológica (TPA) soil through the detection of natural gamma ray emitted by the ground. The excavations carried out on the indications of magnetometry and GPR yielded the recovery of ceramics, faience, lithics, and iron artifacts. The scintillometric data showed that exist a good correlation between low radiation and large thickness of ABE (TPA). The used geophysical methodology proved to be efficient and quick with no destructive impact to the sites.Item Acesso aberto (Open Access) Prospecção de água subterrânea no município de Piçarra-PA usando VLF e resistividade(Universidade Federal do Pará, 2011) SOUSA, Gilvana Bezerra de; LUIZ, José Gouvêa; http://lattes.cnpq.br/8676530374310847This research was carried through in Piçarra city, located in the southeast of Pará state. The study had as main focus the mapping of lineaments associated with the basement fractures and the subsoil nature through geophysics, using the Very Low Frequency (VLF) electromagnetic and resistivity methods. The integrated analysis of geophysical data allowed the recognition of two hydrogeological domains in the area: Fractured zones and sediment thickness above the basement rocks, aiming to guide the location of groundwater captation wells. The study provided indications of the most promising locations for groundwater captation and the best sites to build water wells for the city supply.