BS degree in Geology at UFBA (1987), MS degree in Geophysics at UFPA (1991), PhD degree in Geophysics at UNESP (1999), and Post-PhD in Geophysics at Western Michigan University-USA (2005). Since 1998 is Professor of the Department of Geophysics at USP, Brazil. Interest areas: Applied Geophysics to studies geological, geotechnical, environmental, hydrogeological, mining, urban planning, and archaeology. Themes: GPR, TDEM and Electrical Resistivity. Supervisors: Walter Malagutti and William Sauck
Monitoring pipelines integrity and leakages detection deserve huge attention in the frame of effe... more Monitoring pipelines integrity and leakages detection deserve huge attention in the frame of effective management of hydraulic structures as well as for planning maintenance actions with the final aim to not waste water resources. These diagnostic activities demand for state of art technologies able to survey subsurface infrastructures quickly, accurately and in a non-invasive way. In this frame, the use of ground penetrating radar (GPR) systems are worth to be considered due to their capability of exploiting radio frequencies and microwave signals to achieve space-time maps, known as radargrams, providing images which account for the underground features [1]. However, since the raw-radargrams gathered during GPR measurement campaigns are usually not easy to be interpreted, the usability of the results depends on the users expertise [1]. Moreover, the complexity of the scenario under test may significantly impact the prompt detection of leakages and accurate monitoring of their time...
8th International Congress of the Brazilian Geophysical Society, 2003
The GPR method was applied on a typical slope associated with linear erosion. The study area is l... more The GPR method was applied on a typical slope associated with linear erosion. The study area is locatedon Araguaia River upper part where are several big gully caused by the worst management of soil. Two GPR profiles were carried out with 100 and 50MHz antennas aiming to image subsurface structures. The results showed a thickness sand soil, a strong reflector associated with transition sand soil to sandstone, the top of water table and several primary structures. These structures associated with the top of water table in lower boundary of slope make this region to be more susceptible to linear erosions.
5th International Congress of the Brazilian Geophysical Society, 1997
O presente estudo, cujos resultados preliminares săo apresentados neste trabalho, consiste na uti... more O presente estudo, cujos resultados preliminares săo apresentados neste trabalho, consiste na utilizacăo integrada de tecnicas geofisicas para subsidiar a avaliacăo do impacto ambiental, em subsuperficie, causado pelo aterro sanitario da cidade de Rio Claro-SP. Este aterro, localiza-se ao lado da rodovia Fausto Santomauro (SP 127) que interliga os rnunicipios de Rio Claro e Piracicaba, na altura do Km 2, possuindo uma area total de 44.242,16 m2.
<p&amp... more <p>A Soil Pipe System (SPS) were identified in Candói region, located in the Paraná state, southern Brazil. This region is constituted of intensive agriculture and cattle raising. SPS correspond to a structure associated to an erosive processes stage in downhill slope that tend to increase over time. The growth of the SPS results in instability to the terrain and the possibility of collapse, in this case the collapse can be accelerated by external factors, such as the overload of agricultural machinery and animals that circulate around the site, may leading to the machinery loss, animal’s death or even risk to worker safety. Frequently, the SPS are identified by surface methods that don’t provide parameters such as shape, distribution and depth. In this research, Electrical Resistivity Tomography (ERT) and Ground Penetrating Radar (GPR) were used to obtain a 3D characterization of the SPS identified in a farm in Candói region to estimate the soil cover over the structure, the subsurface channels distribution and identify potential collapse risk portions. Seven ERT profiles using dipole-dipole array and twenty-one GPR profiles of 200 MHz antenna were acquired, covering an area of 900 m². The results were combined in a block diagram, which enabled: i) identify the subsurface channels distribution and direction, ii) estimate the average soil cover thickness, with 1.5 m over the whole structure. The possible connection between subsurface secondary and primary channels has also been suggested in results interpretation through of identification of a channel parallel to acquisition profiles direction. It was verified that in structure portions closer to the river next to the slope, the SPS ceiling has larger dimensions than the walls, suggesting areas with increased vertical tension, which was classified as potential collapse risk areas.</p>
This paper provides a comparative study between microwave tomography and synthetic time-reversal ... more This paper provides a comparative study between microwave tomography and synthetic time-reversal imaging techniques as applied to ground penetrating radar (GPR) surveys. The comparison is carried out by processing experimental data collected at a controlled test site, with various types of buried targets at given subsurface depths and representative soil conditions. It is shown that the two techniques allow us to obtain complementary information about position, depth and size of the targets from a single GPR survey.
A utilização de métodos geofísicos em prospecções arqueológicas é crescente e se deve à necessida... more A utilização de métodos geofísicos em prospecções arqueológicas é crescente e se deve à necessidade, cada vez maior, de uma investigação mais eficiente e não destrutiva. Este trabalho mostra como as prospecções geofísicas puderam auxiliar as investigações arqueológicas no Sítio Capelinha. A área prospectada é um sambaqui fluvial, muito discreto na topografia, situado em Cajati (São Paulo, Brasil). Os métodos de magnetometria e georadar (GPR) localizaram os alvos com maior potencial arqueológico, como, por exemplo, uma paleofogueira, que até o presente momento é única em todo o sítio, com pontas de flecha e restos ósseos associados e uma estrutura de escavação-preenchimento.
Near Surface Geoscience 2014 - 20th European Meeting of Environmental and Engineering Geophysics, 2014
ABSTRACT This paper shows the preliminary results of GPR and ER profiles on asphaltic sandstones.... more ABSTRACT This paper shows the preliminary results of GPR and ER profiles on asphaltic sandstones. The study area is located in the municipality of Anhembi, situated on the eastern border of the Paraná basin, central-eastern region of the São Paulo state, Brazil. The region has been the subject of studies by Petrobras (Brazilian Oil Exploration Company) due to the presence of cumulative bitumen in sandstones. The results of ER show zones of high conductivity that match with the absences of reflections in GPR profiles. Although preliminary, the results suggest the presence of bacterial action, featuring a biodegradation problem. Despite this, detailed studies are in progress to test the biodegradation hypothesis.
Monitoring pipelines integrity and leakages detection deserve huge attention in the frame of effe... more Monitoring pipelines integrity and leakages detection deserve huge attention in the frame of effective management of hydraulic structures as well as for planning maintenance actions with the final aim to not waste water resources. These diagnostic activities demand for state of art technologies able to survey subsurface infrastructures quickly, accurately and in a non-invasive way. In this frame, the use of ground penetrating radar (GPR) systems are worth to be considered due to their capability of exploiting radio frequencies and microwave signals to achieve space-time maps, known as radargrams, providing images which account for the underground features [1]. However, since the raw-radargrams gathered during GPR measurement campaigns are usually not easy to be interpreted, the usability of the results depends on the users expertise [1]. Moreover, the complexity of the scenario under test may significantly impact the prompt detection of leakages and accurate monitoring of their time...
8th International Congress of the Brazilian Geophysical Society, 2003
The GPR method was applied on a typical slope associated with linear erosion. The study area is l... more The GPR method was applied on a typical slope associated with linear erosion. The study area is locatedon Araguaia River upper part where are several big gully caused by the worst management of soil. Two GPR profiles were carried out with 100 and 50MHz antennas aiming to image subsurface structures. The results showed a thickness sand soil, a strong reflector associated with transition sand soil to sandstone, the top of water table and several primary structures. These structures associated with the top of water table in lower boundary of slope make this region to be more susceptible to linear erosions.
5th International Congress of the Brazilian Geophysical Society, 1997
O presente estudo, cujos resultados preliminares săo apresentados neste trabalho, consiste na uti... more O presente estudo, cujos resultados preliminares săo apresentados neste trabalho, consiste na utilizacăo integrada de tecnicas geofisicas para subsidiar a avaliacăo do impacto ambiental, em subsuperficie, causado pelo aterro sanitario da cidade de Rio Claro-SP. Este aterro, localiza-se ao lado da rodovia Fausto Santomauro (SP 127) que interliga os rnunicipios de Rio Claro e Piracicaba, na altura do Km 2, possuindo uma area total de 44.242,16 m2.
<p&amp... more <p>A Soil Pipe System (SPS) were identified in Candói region, located in the Paraná state, southern Brazil. This region is constituted of intensive agriculture and cattle raising. SPS correspond to a structure associated to an erosive processes stage in downhill slope that tend to increase over time. The growth of the SPS results in instability to the terrain and the possibility of collapse, in this case the collapse can be accelerated by external factors, such as the overload of agricultural machinery and animals that circulate around the site, may leading to the machinery loss, animal’s death or even risk to worker safety. Frequently, the SPS are identified by surface methods that don’t provide parameters such as shape, distribution and depth. In this research, Electrical Resistivity Tomography (ERT) and Ground Penetrating Radar (GPR) were used to obtain a 3D characterization of the SPS identified in a farm in Candói region to estimate the soil cover over the structure, the subsurface channels distribution and identify potential collapse risk portions. Seven ERT profiles using dipole-dipole array and twenty-one GPR profiles of 200 MHz antenna were acquired, covering an area of 900 m². The results were combined in a block diagram, which enabled: i) identify the subsurface channels distribution and direction, ii) estimate the average soil cover thickness, with 1.5 m over the whole structure. The possible connection between subsurface secondary and primary channels has also been suggested in results interpretation through of identification of a channel parallel to acquisition profiles direction. It was verified that in structure portions closer to the river next to the slope, the SPS ceiling has larger dimensions than the walls, suggesting areas with increased vertical tension, which was classified as potential collapse risk areas.</p>
This paper provides a comparative study between microwave tomography and synthetic time-reversal ... more This paper provides a comparative study between microwave tomography and synthetic time-reversal imaging techniques as applied to ground penetrating radar (GPR) surveys. The comparison is carried out by processing experimental data collected at a controlled test site, with various types of buried targets at given subsurface depths and representative soil conditions. It is shown that the two techniques allow us to obtain complementary information about position, depth and size of the targets from a single GPR survey.
A utilização de métodos geofísicos em prospecções arqueológicas é crescente e se deve à necessida... more A utilização de métodos geofísicos em prospecções arqueológicas é crescente e se deve à necessidade, cada vez maior, de uma investigação mais eficiente e não destrutiva. Este trabalho mostra como as prospecções geofísicas puderam auxiliar as investigações arqueológicas no Sítio Capelinha. A área prospectada é um sambaqui fluvial, muito discreto na topografia, situado em Cajati (São Paulo, Brasil). Os métodos de magnetometria e georadar (GPR) localizaram os alvos com maior potencial arqueológico, como, por exemplo, uma paleofogueira, que até o presente momento é única em todo o sítio, com pontas de flecha e restos ósseos associados e uma estrutura de escavação-preenchimento.
Near Surface Geoscience 2014 - 20th European Meeting of Environmental and Engineering Geophysics, 2014
ABSTRACT This paper shows the preliminary results of GPR and ER profiles on asphaltic sandstones.... more ABSTRACT This paper shows the preliminary results of GPR and ER profiles on asphaltic sandstones. The study area is located in the municipality of Anhembi, situated on the eastern border of the Paraná basin, central-eastern region of the São Paulo state, Brazil. The region has been the subject of studies by Petrobras (Brazilian Oil Exploration Company) due to the presence of cumulative bitumen in sandstones. The results of ER show zones of high conductivity that match with the absences of reflections in GPR profiles. Although preliminary, the results suggest the presence of bacterial action, featuring a biodegradation problem. Despite this, detailed studies are in progress to test the biodegradation hypothesis.
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Papers by Jorge Luís Porsani