Aplicações de técnicas geofísicas na parte emersa da Baía de Guanabara: uma revisão bibliográfica
Autor(a) principal: | |
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Data de Publicação: | 2003 |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Anuário do Instituto de Geociências (Online) |
Texto Completo: | https://revistas.ufrj.br/index.php/aigeo/article/view/6253 |
Resumo: | This paper presents the application of the geophysical techniques on two investigations around of Baía de Guanabara, Rio de Janeiro. The first one was carried out in the area of the Petroflex, a petrochemical industry, located at Campos Elíseos area in the bank of the bay and the second one at Ilha do Fundão, one of the island slocated in Guanabara bay. According to Anjos et al.. (2001) the research at Petroflex area was part of the company Social Project: "Conheça seu Manguezal" (Knowing your mangrove). For this research the geophysical survey was applied within the industrial park in order to identify solid waste contamination (rubber, plastic and metal barrels). The Ground Penetrating Radar (GPR) technique was used with the RAMAC/MALA equipment. The study area consists of clay and sands deposited in marine conditions, which are frequently contaminated by salt water. In general, the GPR results obtained in both media, clay material and sediments saturated with salt water are not satisfactory. However the results obtained in the Petroflex area were good. The stratigraphic sequence in the area is the following, from top to bottom: The first bed is a clay landfill, the second bed is formed by dark marine clay, and the third bed is composed of fine-grained sand with marine shells. The surveys originated sections with average depths of 14 m and average velocity of 70 m/µs. The results showed two physical discontinuities within the second bed (marine clay), which possibly represent a Pleistocene platform exposition, described in the literature as Guanabariana Regression. It was also possible to identify anomalies within the first bed (clay landfill) represented by signal attenuation, and the others identify waste deposits, where the presence of buried drums was verified. Such work has demonstrated the success of GPR applicability even to clay soil contaminated by salt water. The Ilha do Fundão where the second investigation took place, according to Rocha et al. (1998) is the result of an artificial embankment of a former small archipelago, built in the early 1950's. The aim of this work was to identify, by means of a geoelectric survey, the cores of the original islands. Normally, structures near the seacoast cannot be detected through geoelectric measurements. This is due to the presence of salt water in sediments. However, in the Ilha do Fundão case, the high electric conductivity sediments have a lens shaped with small thickness and correspond to the embankments. This circumstance allows the detection of deep layers and resistive nuclei. Results were obtained from vertical electric soundings using Schlumberger configuration with a maximum aperture (ab/2) of 100 m. The original data was published in Rocha et al. (1998). |
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Aplicações de técnicas geofísicas na parte emersa da Baía de Guanabara: uma revisão bibliográficaThis paper presents the application of the geophysical techniques on two investigations around of Baía de Guanabara, Rio de Janeiro. The first one was carried out in the area of the Petroflex, a petrochemical industry, located at Campos Elíseos area in the bank of the bay and the second one at Ilha do Fundão, one of the island slocated in Guanabara bay. According to Anjos et al.. (2001) the research at Petroflex area was part of the company Social Project: "Conheça seu Manguezal" (Knowing your mangrove). For this research the geophysical survey was applied within the industrial park in order to identify solid waste contamination (rubber, plastic and metal barrels). The Ground Penetrating Radar (GPR) technique was used with the RAMAC/MALA equipment. The study area consists of clay and sands deposited in marine conditions, which are frequently contaminated by salt water. In general, the GPR results obtained in both media, clay material and sediments saturated with salt water are not satisfactory. However the results obtained in the Petroflex area were good. The stratigraphic sequence in the area is the following, from top to bottom: The first bed is a clay landfill, the second bed is formed by dark marine clay, and the third bed is composed of fine-grained sand with marine shells. The surveys originated sections with average depths of 14 m and average velocity of 70 m/µs. The results showed two physical discontinuities within the second bed (marine clay), which possibly represent a Pleistocene platform exposition, described in the literature as Guanabariana Regression. It was also possible to identify anomalies within the first bed (clay landfill) represented by signal attenuation, and the others identify waste deposits, where the presence of buried drums was verified. Such work has demonstrated the success of GPR applicability even to clay soil contaminated by salt water. The Ilha do Fundão where the second investigation took place, according to Rocha et al. (1998) is the result of an artificial embankment of a former small archipelago, built in the early 1950's. The aim of this work was to identify, by means of a geoelectric survey, the cores of the original islands. Normally, structures near the seacoast cannot be detected through geoelectric measurements. This is due to the presence of salt water in sediments. However, in the Ilha do Fundão case, the high electric conductivity sediments have a lens shaped with small thickness and correspond to the embankments. This circumstance allows the detection of deep layers and resistive nuclei. Results were obtained from vertical electric soundings using Schlumberger configuration with a maximum aperture (ab/2) of 100 m. The original data was published in Rocha et al. (1998).Este trabalho apresenta a aplicação de técnicas geofísicas em duas investigações realizadas no entorno da baía de Guanabara, Rio de Janeiro. A primeira foi executada na área da Petroflex, uma indústria petroquímica situada na região de Campos Elíseos às margens da baía e a segunda na Ilha do Fundão localizada dentro da mesma. Segundo Anjos et al..(2001) a pesquisa na Petroflex foi parte de um projeto social desta companhia chamado: "Conheça seu Manguezal". Para este estudo a pesquisa geofísica foi realizada dentro do parque industrial a fim de identificar contaminação de lixo sólido (borracha, plástico e latão metálico). Foi usada a técnica do Ground Penetrating Radar (GPR) com o equipamento RAMAC/MALA. Na área de estudo são encontradas argila e areia, depositadas em condições marinhas as quais são freqüentemente contaminadas por água salgada. Em geral, os resultados obtidos com o GPR para argilas e sedimentos saturados em água não são satisfatórios. Entretanto, na área da Petroflex os resultados foram bons. A seqüência estratigráfica na área é a seguinte, do topo para a base: A camada mais superior é um depósito de argila, a segunda camada é formada de argila marinha escura e a terceira camada é composta de areia de grãos finos com conchas marinhas . A interpretação das linhas de GPR com profundidade média de 14 m e velocidade média de 70m/µs, mostrou duas descontinuidades físicas dentro da segunda camada (argila marinha) a qual possivelmente representa a exposição da plataforma no Pleistoceno, descrita na literatura como Regression Guanabariana. Foi possível identificar também anomalias dentro da primeira camada (depósito de argila), representada por um sinal atenuado e outras identificadas como tambores com resíduos sólidos. Este trabalho mostrou um exemplo de sucesso da aplicação do GPR em locais argilosos com presença de água salgada. A Ilha do Fundão, local da segunda investigação, segundo Rocha et al.. (1998) foi formada por um aterro artificial em um arquipélago formado por pequenas ilhas construído nos anos de 1950. O objetivo da investigação foi identificar por meio de uma pesquisa geoelétrica os núcleos originais das ilhas. Normalmente, estruturas próximas de regiões costeiras não podem ser detectadas devido à presença de água salgada nos sedimentos. Entretanto no caso da Ilha do Fundão os sedimentos eletricamente condutivos têm uma forma lenticular de pouca espessura correspondendo ao aterro. Essa geometria permitiu a detecção dos núcleos resistivos os quais são as ilha originais do arquipélago. Tais conclusões foram baseadas nos resultados da sondagem elétrica usando a configuração de Schlumberger com a abertura máxima (ab/2) de 100 ms. Os dados originais foram publicadosem Rocha et al.(1998).Universidade Federal do Rio de JaneiroRocha, Paula Lucia Ferrucio da2003-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://revistas.ufrj.br/index.php/aigeo/article/view/625310.11137/2003_0_117-126Anuário do Instituto de Geociências; Vol 26 (2003); 117-126Anuário do Instituto de Geociências; Vol 26 (2003); 117-1261982-39080101-9759reponame:Anuário do Instituto de Geociências (Online)instname:Universidade Federal do Rio de Janeiro (UFRJ)instacron:UFRJporhttps://revistas.ufrj.br/index.php/aigeo/article/view/6253/4850Copyright (c) 2003 Anuário do Instituto de Geociênciashttp://creativecommons.org/licenses/by/4.0info:eu-repo/semantics/openAccess2021-08-20T10:58:57Zoai:www.revistas.ufrj.br:article/6253Revistahttps://revistas.ufrj.br/index.php/aigeo/indexPUBhttps://revistas.ufrj.br/index.php/aigeo/oaianuario@igeo.ufrj.br||1982-39080101-9759opendoar:2021-08-20T10:58:57Anuário do Instituto de Geociências (Online) - Universidade Federal do Rio de Janeiro (UFRJ)false |
dc.title.none.fl_str_mv |
Aplicações de técnicas geofísicas na parte emersa da Baía de Guanabara: uma revisão bibliográfica |
title |
Aplicações de técnicas geofísicas na parte emersa da Baía de Guanabara: uma revisão bibliográfica |
spellingShingle |
Aplicações de técnicas geofísicas na parte emersa da Baía de Guanabara: uma revisão bibliográfica Rocha, Paula Lucia Ferrucio da |
title_short |
Aplicações de técnicas geofísicas na parte emersa da Baía de Guanabara: uma revisão bibliográfica |
title_full |
Aplicações de técnicas geofísicas na parte emersa da Baía de Guanabara: uma revisão bibliográfica |
title_fullStr |
Aplicações de técnicas geofísicas na parte emersa da Baía de Guanabara: uma revisão bibliográfica |
title_full_unstemmed |
Aplicações de técnicas geofísicas na parte emersa da Baía de Guanabara: uma revisão bibliográfica |
title_sort |
Aplicações de técnicas geofísicas na parte emersa da Baía de Guanabara: uma revisão bibliográfica |
author |
Rocha, Paula Lucia Ferrucio da |
author_facet |
Rocha, Paula Lucia Ferrucio da |
author_role |
author |
dc.contributor.none.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
Rocha, Paula Lucia Ferrucio da |
dc.subject.none.fl_str_mv |
|
description |
This paper presents the application of the geophysical techniques on two investigations around of Baía de Guanabara, Rio de Janeiro. The first one was carried out in the area of the Petroflex, a petrochemical industry, located at Campos Elíseos area in the bank of the bay and the second one at Ilha do Fundão, one of the island slocated in Guanabara bay. According to Anjos et al.. (2001) the research at Petroflex area was part of the company Social Project: "Conheça seu Manguezal" (Knowing your mangrove). For this research the geophysical survey was applied within the industrial park in order to identify solid waste contamination (rubber, plastic and metal barrels). The Ground Penetrating Radar (GPR) technique was used with the RAMAC/MALA equipment. The study area consists of clay and sands deposited in marine conditions, which are frequently contaminated by salt water. In general, the GPR results obtained in both media, clay material and sediments saturated with salt water are not satisfactory. However the results obtained in the Petroflex area were good. The stratigraphic sequence in the area is the following, from top to bottom: The first bed is a clay landfill, the second bed is formed by dark marine clay, and the third bed is composed of fine-grained sand with marine shells. The surveys originated sections with average depths of 14 m and average velocity of 70 m/µs. The results showed two physical discontinuities within the second bed (marine clay), which possibly represent a Pleistocene platform exposition, described in the literature as Guanabariana Regression. It was also possible to identify anomalies within the first bed (clay landfill) represented by signal attenuation, and the others identify waste deposits, where the presence of buried drums was verified. Such work has demonstrated the success of GPR applicability even to clay soil contaminated by salt water. The Ilha do Fundão where the second investigation took place, according to Rocha et al. (1998) is the result of an artificial embankment of a former small archipelago, built in the early 1950's. The aim of this work was to identify, by means of a geoelectric survey, the cores of the original islands. Normally, structures near the seacoast cannot be detected through geoelectric measurements. This is due to the presence of salt water in sediments. However, in the Ilha do Fundão case, the high electric conductivity sediments have a lens shaped with small thickness and correspond to the embankments. This circumstance allows the detection of deep layers and resistive nuclei. Results were obtained from vertical electric soundings using Schlumberger configuration with a maximum aperture (ab/2) of 100 m. The original data was published in Rocha et al. (1998). |
publishDate |
2003 |
dc.date.none.fl_str_mv |
2003-01-01 |
dc.type.none.fl_str_mv |
|
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
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article |
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publishedVersion |
dc.identifier.uri.fl_str_mv |
https://revistas.ufrj.br/index.php/aigeo/article/view/6253 10.11137/2003_0_117-126 |
url |
https://revistas.ufrj.br/index.php/aigeo/article/view/6253 |
identifier_str_mv |
10.11137/2003_0_117-126 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://revistas.ufrj.br/index.php/aigeo/article/view/6253/4850 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2003 Anuário do Instituto de Geociências http://creativecommons.org/licenses/by/4.0 info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2003 Anuário do Instituto de Geociências http://creativecommons.org/licenses/by/4.0 |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal do Rio de Janeiro |
publisher.none.fl_str_mv |
Universidade Federal do Rio de Janeiro |
dc.source.none.fl_str_mv |
Anuário do Instituto de Geociências; Vol 26 (2003); 117-126 Anuário do Instituto de Geociências; Vol 26 (2003); 117-126 1982-3908 0101-9759 reponame:Anuário do Instituto de Geociências (Online) instname:Universidade Federal do Rio de Janeiro (UFRJ) instacron:UFRJ |
instname_str |
Universidade Federal do Rio de Janeiro (UFRJ) |
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UFRJ |
institution |
UFRJ |
reponame_str |
Anuário do Instituto de Geociências (Online) |
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Anuário do Instituto de Geociências (Online) |
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Anuário do Instituto de Geociências (Online) - Universidade Federal do Rio de Janeiro (UFRJ) |
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anuario@igeo.ufrj.br|| |
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1797053539100393472 |