Persistent Scatterers Interferometry detects and measures ground subsidence in Lisbon

Detalhes bibliográficos
Autor(a) principal: Heleno, S.
Data de Publicação: 2011
Outros Autores: Oliveira, L. G. S., Henriques, M. J., Falcão, A. P., Lima, J. N., Cooksley, G., Ferretti, A., Fonseca, A. M., Lobo Ferreira, J. P. C., Fonseca, J.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://repositorio.lnec.pt:8080/jspui/handle/123456789/1002124
Resumo: Results from the application of Persistent Scatterers Interferometry in Lisbon Metropolitan Area revealed two previously unknown subsiding urban areas: one (Laranjeiras) is located in the center of Lisbon; another (Vialonga) is to be found toward the North, in an industrial region crossed by Lisbon's main highway and railway lines. The two subsiding sectors are bordered by sharp velocity gradients, and the subsidence pattern appears partially delimited by mapped geologic faults. Surface geology and urbanization alone are unable to explain the phenomena. In the Vialonga area, the historical record of water pore pressure shows a clear decline of the levels (up to 65 m in 27 years), providing evidence of over-exploitation of groundwater resources. Limited information from wells drilled inside and outside the subsidence area points to a spatial correlation between the subsidence and the water pressure levels, and suggests that faults could be acting as hydraulic barriers in the aquifer system. The surface subsidence detected is probably caused by compaction of a clay-rich Oligocene-aged aquitard, led by over-exploitation of adjacent aquifers. The same Oligocene aquitard layer is present in the Laranjeiras area, immediately bellow a multi-layered sand–clay–limestone Miocene aquifer, but further work is needed to diagnose the possibility of over-exploitation of groundwater here. In this work we were able to independently confirm the PSI results, by comparing autonomous PSI results processed for the same geographical areas, and by comparing PSI with leveling and continuous GPS derived subsidence velocities, whose close match provided further ground validation of the space-borne PSI technique. © 2011 Elsevier Inc. All rights reserved
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spelling Persistent Scatterers Interferometry detects and measures ground subsidence in LisbonPersistent scatterers interferometry detects and measuresGround subsidence in lisbonResults from the application of Persistent Scatterers Interferometry in Lisbon Metropolitan Area revealed two previously unknown subsiding urban areas: one (Laranjeiras) is located in the center of Lisbon; another (Vialonga) is to be found toward the North, in an industrial region crossed by Lisbon's main highway and railway lines. The two subsiding sectors are bordered by sharp velocity gradients, and the subsidence pattern appears partially delimited by mapped geologic faults. Surface geology and urbanization alone are unable to explain the phenomena. In the Vialonga area, the historical record of water pore pressure shows a clear decline of the levels (up to 65 m in 27 years), providing evidence of over-exploitation of groundwater resources. Limited information from wells drilled inside and outside the subsidence area points to a spatial correlation between the subsidence and the water pressure levels, and suggests that faults could be acting as hydraulic barriers in the aquifer system. The surface subsidence detected is probably caused by compaction of a clay-rich Oligocene-aged aquitard, led by over-exploitation of adjacent aquifers. The same Oligocene aquitard layer is present in the Laranjeiras area, immediately bellow a multi-layered sand–clay–limestone Miocene aquifer, but further work is needed to diagnose the possibility of over-exploitation of groundwater here. In this work we were able to independently confirm the PSI results, by comparing autonomous PSI results processed for the same geographical areas, and by comparing PSI with leveling and continuous GPS derived subsidence velocities, whose close match provided further ground validation of the space-borne PSI technique. © 2011 Elsevier Inc. All rights reservedElsevier2011-06-09T08:38:18Z2014-10-10T16:12:45Z2017-04-13T12:01:52Z2011-05-10T00:00:00Z2011-05-10info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://repositorio.lnec.pt:8080/jspui/handle/123456789/1002124engHeleno, S.Oliveira, L. G. S.Henriques, M. J.Falcão, A. P.Lima, J. N.Cooksley, G.Ferretti, A.Fonseca, A. M.Lobo Ferreira, J. P. C.Fonseca, J.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-13T03:06:49Zoai:localhost:123456789/1002124Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:40:07.551996Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Persistent Scatterers Interferometry detects and measures ground subsidence in Lisbon
title Persistent Scatterers Interferometry detects and measures ground subsidence in Lisbon
spellingShingle Persistent Scatterers Interferometry detects and measures ground subsidence in Lisbon
Heleno, S.
Persistent scatterers interferometry detects and measures
Ground subsidence in lisbon
title_short Persistent Scatterers Interferometry detects and measures ground subsidence in Lisbon
title_full Persistent Scatterers Interferometry detects and measures ground subsidence in Lisbon
title_fullStr Persistent Scatterers Interferometry detects and measures ground subsidence in Lisbon
title_full_unstemmed Persistent Scatterers Interferometry detects and measures ground subsidence in Lisbon
title_sort Persistent Scatterers Interferometry detects and measures ground subsidence in Lisbon
author Heleno, S.
author_facet Heleno, S.
Oliveira, L. G. S.
Henriques, M. J.
Falcão, A. P.
Lima, J. N.
Cooksley, G.
Ferretti, A.
Fonseca, A. M.
Lobo Ferreira, J. P. C.
Fonseca, J.
author_role author
author2 Oliveira, L. G. S.
Henriques, M. J.
Falcão, A. P.
Lima, J. N.
Cooksley, G.
Ferretti, A.
Fonseca, A. M.
Lobo Ferreira, J. P. C.
Fonseca, J.
author2_role author
author
author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Heleno, S.
Oliveira, L. G. S.
Henriques, M. J.
Falcão, A. P.
Lima, J. N.
Cooksley, G.
Ferretti, A.
Fonseca, A. M.
Lobo Ferreira, J. P. C.
Fonseca, J.
dc.subject.por.fl_str_mv Persistent scatterers interferometry detects and measures
Ground subsidence in lisbon
topic Persistent scatterers interferometry detects and measures
Ground subsidence in lisbon
description Results from the application of Persistent Scatterers Interferometry in Lisbon Metropolitan Area revealed two previously unknown subsiding urban areas: one (Laranjeiras) is located in the center of Lisbon; another (Vialonga) is to be found toward the North, in an industrial region crossed by Lisbon's main highway and railway lines. The two subsiding sectors are bordered by sharp velocity gradients, and the subsidence pattern appears partially delimited by mapped geologic faults. Surface geology and urbanization alone are unable to explain the phenomena. In the Vialonga area, the historical record of water pore pressure shows a clear decline of the levels (up to 65 m in 27 years), providing evidence of over-exploitation of groundwater resources. Limited information from wells drilled inside and outside the subsidence area points to a spatial correlation between the subsidence and the water pressure levels, and suggests that faults could be acting as hydraulic barriers in the aquifer system. The surface subsidence detected is probably caused by compaction of a clay-rich Oligocene-aged aquitard, led by over-exploitation of adjacent aquifers. The same Oligocene aquitard layer is present in the Laranjeiras area, immediately bellow a multi-layered sand–clay–limestone Miocene aquifer, but further work is needed to diagnose the possibility of over-exploitation of groundwater here. In this work we were able to independently confirm the PSI results, by comparing autonomous PSI results processed for the same geographical areas, and by comparing PSI with leveling and continuous GPS derived subsidence velocities, whose close match provided further ground validation of the space-borne PSI technique. © 2011 Elsevier Inc. All rights reserved
publishDate 2011
dc.date.none.fl_str_mv 2011-06-09T08:38:18Z
2011-05-10T00:00:00Z
2011-05-10
2014-10-10T16:12:45Z
2017-04-13T12:01:52Z
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dc.language.iso.fl_str_mv eng
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dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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