Rainfall patterns and critical values associated with landslides in Povoação County (São Miguel Island, Azores): relationships with the North Atlantic Oscillation
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10451/36688 |
Resumo: | São Miguel Island (Azores) has been affected by hundreds of destructive landslide episodes in the last five centuries, triggeredeither by earthquakes, volcanic eruptions or rainfall episodes, which were responsible for many deaths and very importanteconomic losses.Among the instability causes, meteorological factors are of primary importance on Povoação County, namely the highrecurrence rate of calamitous rainfall triggering landslides. The most recent catastrophic episode took place on the 31st October 1997 when almost 1000 soil slips and debris flows were triggered, and 29 people died in the Ribeira Quente village.The role of rainfall on regional landslide activity was analysed applying cumulative rainfall methods. The method comprisesthe reconstruction of both absolute and calibrated antecedent rainfalls associated with each major landslide event. Thecritical rainfall combination (amount-duration) responsible for each landslide event was assessed and a rainfall criticalthreshold for landslide occurrence was calculated. Rainfall-triggered landslides in the study area are ruled by the functionID144Ð06D 0Ð5551, and they are related both to short duration precipitation events (1 – 3 days) with high average intensity(between 78 and 144 mm/day) and long-lasting rainfall episodes (1 – 5 months) with a lower intensity (between 9 and22 mm/day).The impact of the North Atlantic Oscillation (NAO) on the regional precipitation regime was evaluated. It is shown thatthe monthly precipitation of S ̃ao Miguel is largely modulated by the NAO mode presenting a significant negative correlationwith the NAO index. This result arises from the NAO control on the travelling latitude of most storm tracks that cross theNorthern Atlantic Ocean. |
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Rainfall patterns and critical values associated with landslides in Povoação County (São Miguel Island, Azores): relationships with the North Atlantic Oscillationlandslidesrainfall patternsNorth Atlantic OscilationSão MiguelAzoresSão Miguel Island (Azores) has been affected by hundreds of destructive landslide episodes in the last five centuries, triggeredeither by earthquakes, volcanic eruptions or rainfall episodes, which were responsible for many deaths and very importanteconomic losses.Among the instability causes, meteorological factors are of primary importance on Povoação County, namely the highrecurrence rate of calamitous rainfall triggering landslides. The most recent catastrophic episode took place on the 31st October 1997 when almost 1000 soil slips and debris flows were triggered, and 29 people died in the Ribeira Quente village.The role of rainfall on regional landslide activity was analysed applying cumulative rainfall methods. The method comprisesthe reconstruction of both absolute and calibrated antecedent rainfalls associated with each major landslide event. Thecritical rainfall combination (amount-duration) responsible for each landslide event was assessed and a rainfall criticalthreshold for landslide occurrence was calculated. Rainfall-triggered landslides in the study area are ruled by the functionID144Ð06D 0Ð5551, and they are related both to short duration precipitation events (1 – 3 days) with high average intensity(between 78 and 144 mm/day) and long-lasting rainfall episodes (1 – 5 months) with a lower intensity (between 9 and22 mm/day).The impact of the North Atlantic Oscillation (NAO) on the regional precipitation regime was evaluated. It is shown thatthe monthly precipitation of S ̃ao Miguel is largely modulated by the NAO mode presenting a significant negative correlationwith the NAO index. This result arises from the NAO control on the travelling latitude of most storm tracks that cross theNorthern Atlantic Ocean.WileyRepositório da Universidade de LisboaMarques, RuiZêzere, JoséTrigo, RicardoGaspar, JoãoTrigo, Isabel2019-01-25T11:05:58Z20082008-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10451/36688engMarques, R., Zêzere, J., Trigo, R., Gaspar, J., & Trigo, I. (2008). Rainfall patterns and critical values associated with landslides in Povoação County (São Miguel Island, Azores): Relationships with the North Atlantic Oscillation. Hydrological Processes. https://doi.org/10.1002/hyp.68791099-108510.1002/hyp.6879info: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:RCAAP2023-11-08T16:33:25Zoai:repositorio.ul.pt:10451/36688Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:50:53.638517Repositório 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 |
Rainfall patterns and critical values associated with landslides in Povoação County (São Miguel Island, Azores): relationships with the North Atlantic Oscillation |
title |
Rainfall patterns and critical values associated with landslides in Povoação County (São Miguel Island, Azores): relationships with the North Atlantic Oscillation |
spellingShingle |
Rainfall patterns and critical values associated with landslides in Povoação County (São Miguel Island, Azores): relationships with the North Atlantic Oscillation Marques, Rui landslides rainfall patterns North Atlantic Oscilation São Miguel Azores |
title_short |
Rainfall patterns and critical values associated with landslides in Povoação County (São Miguel Island, Azores): relationships with the North Atlantic Oscillation |
title_full |
Rainfall patterns and critical values associated with landslides in Povoação County (São Miguel Island, Azores): relationships with the North Atlantic Oscillation |
title_fullStr |
Rainfall patterns and critical values associated with landslides in Povoação County (São Miguel Island, Azores): relationships with the North Atlantic Oscillation |
title_full_unstemmed |
Rainfall patterns and critical values associated with landslides in Povoação County (São Miguel Island, Azores): relationships with the North Atlantic Oscillation |
title_sort |
Rainfall patterns and critical values associated with landslides in Povoação County (São Miguel Island, Azores): relationships with the North Atlantic Oscillation |
author |
Marques, Rui |
author_facet |
Marques, Rui Zêzere, José Trigo, Ricardo Gaspar, João Trigo, Isabel |
author_role |
author |
author2 |
Zêzere, José Trigo, Ricardo Gaspar, João Trigo, Isabel |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Repositório da Universidade de Lisboa |
dc.contributor.author.fl_str_mv |
Marques, Rui Zêzere, José Trigo, Ricardo Gaspar, João Trigo, Isabel |
dc.subject.por.fl_str_mv |
landslides rainfall patterns North Atlantic Oscilation São Miguel Azores |
topic |
landslides rainfall patterns North Atlantic Oscilation São Miguel Azores |
description |
São Miguel Island (Azores) has been affected by hundreds of destructive landslide episodes in the last five centuries, triggeredeither by earthquakes, volcanic eruptions or rainfall episodes, which were responsible for many deaths and very importanteconomic losses.Among the instability causes, meteorological factors are of primary importance on Povoação County, namely the highrecurrence rate of calamitous rainfall triggering landslides. The most recent catastrophic episode took place on the 31st October 1997 when almost 1000 soil slips and debris flows were triggered, and 29 people died in the Ribeira Quente village.The role of rainfall on regional landslide activity was analysed applying cumulative rainfall methods. The method comprisesthe reconstruction of both absolute and calibrated antecedent rainfalls associated with each major landslide event. Thecritical rainfall combination (amount-duration) responsible for each landslide event was assessed and a rainfall criticalthreshold for landslide occurrence was calculated. Rainfall-triggered landslides in the study area are ruled by the functionID144Ð06D 0Ð5551, and they are related both to short duration precipitation events (1 – 3 days) with high average intensity(between 78 and 144 mm/day) and long-lasting rainfall episodes (1 – 5 months) with a lower intensity (between 9 and22 mm/day).The impact of the North Atlantic Oscillation (NAO) on the regional precipitation regime was evaluated. It is shown thatthe monthly precipitation of S ̃ao Miguel is largely modulated by the NAO mode presenting a significant negative correlationwith the NAO index. This result arises from the NAO control on the travelling latitude of most storm tracks that cross theNorthern Atlantic Ocean. |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008 2008-01-01T00:00:00Z 2019-01-25T11:05:58Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10451/36688 |
url |
http://hdl.handle.net/10451/36688 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Marques, R., Zêzere, J., Trigo, R., Gaspar, J., & Trigo, I. (2008). Rainfall patterns and critical values associated with landslides in Povoação County (São Miguel Island, Azores): Relationships with the North Atlantic Oscillation. Hydrological Processes. https://doi.org/10.1002/hyp.6879 1099-1085 10.1002/hyp.6879 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Wiley |
publisher.none.fl_str_mv |
Wiley |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799134443693146112 |