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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Agora exibindo 1 - 3 de 3

Acesso aberto (Open Access)
Caracterização hidrodinâmica do Furo da Laura (Rio Guajará-mirim), Amazônia Oriental
(Universidade Federal do Pará, 2014-12-01) FERNANDES, Aldo Rafael Pascoal; ROLLNIC, Marcelo; http://lattes.cnpq.br/6585442266149471
Preserve our coastal and estuarine environments are of great importance to local and regional development, as these environments are located most cities and serve as a cradle for several specimens, despite these environments gather information and know their characteristic and seasonal patterns are important aspects. In this context, Laura hole (Rio Guajará-Mirim), transitional estuarine environment and important role in the economic and social framework for coastal communities, cities and surroundings, serves as one of the main routes of fishing inputs to the state. The Hole Laura is a water body adjacent to Marajó Bay, has two connections to the same and is under their direct influence, is located at coordinates UTM 22M, 796169-830035 W and S 9880864-9916228 through it were held three oceanographic, dry season (October 2013), the rainy season (February 2014) and dry (August 2014), this important stream with use of equipment for measurement of geophysical parameters in the region bathymetry, hydrodynamic, tide variation and salinity. There was in possession of these parameters the hydrodynamic behavior, classification and tidal range, phase difference between ebb and flood, salinity trend in the stream in response to the Marajó Bay, besides the identification of morphological features characteristics and seasonal analysis these changes in the collection of sections 1 and 2 pre-established, as well as mapping and preparation of a bathymetric map of the study area.
Acesso aberto (Open Access)
Métodos de processamento de sísmica rasa em fundos submersos no baixo curso do rio Amazonas
(Universidade Federal do Pará, 2014-12-02) WATANABE, Fábio Kiyoshi; PINHEIRO, Roberto Vizeu Lima; http://lattes.cnpq.br/3251836412904734; ROLLNIC, Marcelo; http://lattes.cnpq.br/6585442266149471
The study area is located on northeast region of Pará state, it includes the Pará river, Tocantins river’s outfall and Marajó bay. The study is restricted to Amazon estuarine complex, characterized by coastal lowland regions which have been formed during the Holocene marine transgression which flooded vales of rivers. This work aims to improve the knowledge about the shallow seismic methods in the Amazon, specifically on tributary rivers, applying the X-STAR 3200-XS system. The work’s focus is to enable ways to process the information from this geophysical acquisition system, little used in the region, applying methods of treatment in seismic profiles where it’s possible to perceive the horizontal continuity’s distribution and a better morphological identification, besides that is also important locate the depth of acoustic basement. This work intents to present a methodological proposal to investigate the sedimentary unconsolidated covers deposited in submerged areas of different amazonian environments. From these data a processing flow in the region will be made to explain some aspects, related mainly to its limiters, besides more suitable criteria to a better data acquisition.
Acesso aberto (Open Access)
Utilização da sísmica de reflexão rasa no estudo da morfodinâmica de rios na região amazônica
(Universidade Federal do Pará, 2014-09-29) FURTADO, Camila da Cunha; VIZEU, Roberto; ROLLNIC, Marcelo; http://lattes.cnpq.br/6585442266149471
The main idea of this research is identify and characterize morphodynamic phenomena present on the lay of the Pará river and foz of the Tocantins river, this area comprises from the Bocas bay unto east portion of the Marajó island. It is a region where exists scarcity of information and data about constitution and morphology of the lay, there is necessity to search new knowledge. Sediment samples from the bottom of the river were collected with the assistance of a Van Veen sampler, 181 (one hundred eighty-one) samples submitted to macroscopic analysis aiming to identify the type of material which composes the bottom. With the data of hydrodynamic modeled assistance was possible to connect the patterns of bottom forms with the sort of sediment which composes the lay and the prevailing hydrodynamic in the local. Based on the seismic data, was possible to identify and map the sonographic patterns in 15 types of echoes, classified in four categories. The less frequent echo types are the ones which present very irregular lays and little or no acoustic signal penetration. Specially the C1 type characterized by diffraction hyperbolas presence and the D1 type which treat responses arising from large deposits of sediments, found just in two forms of acoustic. The most significant bottom forms were identified on the stretch where the Canaticu river flows to Pará river where the principal canal width decreases from 8km to 4km in upper depth to 20m. The adhibition geophysical methods (acoustics), by the use of the Sub-Bottom profiler SB-0512, enable the knowing of the bottom forms, as well as its dimensions that those submerged forms show over the studied region. The way how this region’s lay sets itself and the dimensions that those corps reach can affect the sailing on some river’s stretch, as well as it can affect future civilian building. Therefore, this work opens ways to future more appropriate investigations on the issues mentioned above.

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Navegando Dissertações em Geofísica (Mestrado) - CPGF/IG por CNPq "CNPQ::CIENCIAS EXATAS E DA TERRA::OCEANOGRAFIA::OCEANOGRAFIA GEOLOGICA::GEOFISICA MARINHA"