Shallow and deep landslides induced by rainfall in the Lisbon region (Portugal): assessment of relationships with the North Atlantic Oscillation
International audience The aim of this study is to assess the impact of the North Atlantic Oscillation (NAO) on both the winter precipitation and the temporal occurrence of different landslide types in Portugal. The analysis is applied to five sample areas located just north of Lisbon, the capital o...
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ftccsdartic:oai:HAL:hal-00299181v1 2023-05-15T17:29:44+02:00 Shallow and deep landslides induced by rainfall in the Lisbon region (Portugal): assessment of relationships with the North Atlantic Oscillation Zêzere, J. L. Trigo, R. M. Trigo, I. F. Centro de Estudos Geográficos CGUL Departamento de Engenharias Instituto de Meteorologia 2005-04-18 https://hal.archives-ouvertes.fr/hal-00299181 https://hal.archives-ouvertes.fr/hal-00299181/document https://hal.archives-ouvertes.fr/hal-00299181/file/nhess-5-331-2005.pdf en eng HAL CCSD Copernicus Publ. / European Geosciences Union hal-00299181 https://hal.archives-ouvertes.fr/hal-00299181 https://hal.archives-ouvertes.fr/hal-00299181/document https://hal.archives-ouvertes.fr/hal-00299181/file/nhess-5-331-2005.pdf info:eu-repo/semantics/OpenAccess ISSN: 1561-8633 EISSN: 1684-9981 Natural Hazards and Earth System Sciences https://hal.archives-ouvertes.fr/hal-00299181 Natural Hazards and Earth System Sciences, Copernicus Publ. / European Geosciences Union, 2005, 5 (3), pp.331-344 [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2005 ftccsdartic 2021-08-21T23:04:27Z International audience The aim of this study is to assess the impact of the North Atlantic Oscillation (NAO) on both the winter precipitation and the temporal occurrence of different landslide types in Portugal. The analysis is applied to five sample areas located just north of Lisbon, the capital of Portugal. These sites are particularly relevant because actual dates of most of the recent landslide events are known but also because the landslides occurred in a suburban area with growing urbanization pressure. Results show that the large inter-annual variability of winter precipitation observed in western Iberia, i.e. Portugal and parts of Spain, is largely modulated by the NAO mode. In particular, precipitation falling in Portugal between November and March presents a correlation coefficient of R =?0.66 with the NAO index. Precipitation distribution for the reference rain gauge in the study area reveals that the probability of a wet month to occur is much higher for low NAO index composites than for the corresponding high NAO index composite. It is shown that this control, exerted by NAO on the precipitation regime, is related to corresponding changes in the associated activity of North-Atlantic storm tracks that affect the western Iberia. Landslide activity in the study area is related to both intense, short duration precipitation events (1?15 days) and long-lasting rainfall episodes (1?3 months). The former events trigger shallow translational slides while the later episodes are usually associated with deeper and larger slope movements. This second group of landslides is shown to be statistically associated with the 3-month average of the NAO index. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Zêzere, J. L. Trigo, R. M. Trigo, I. F. Shallow and deep landslides induced by rainfall in the Lisbon region (Portugal): assessment of relationships with the North Atlantic Oscillation |
topic_facet |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The aim of this study is to assess the impact of the North Atlantic Oscillation (NAO) on both the winter precipitation and the temporal occurrence of different landslide types in Portugal. The analysis is applied to five sample areas located just north of Lisbon, the capital of Portugal. These sites are particularly relevant because actual dates of most of the recent landslide events are known but also because the landslides occurred in a suburban area with growing urbanization pressure. Results show that the large inter-annual variability of winter precipitation observed in western Iberia, i.e. Portugal and parts of Spain, is largely modulated by the NAO mode. In particular, precipitation falling in Portugal between November and March presents a correlation coefficient of R =?0.66 with the NAO index. Precipitation distribution for the reference rain gauge in the study area reveals that the probability of a wet month to occur is much higher for low NAO index composites than for the corresponding high NAO index composite. It is shown that this control, exerted by NAO on the precipitation regime, is related to corresponding changes in the associated activity of North-Atlantic storm tracks that affect the western Iberia. Landslide activity in the study area is related to both intense, short duration precipitation events (1?15 days) and long-lasting rainfall episodes (1?3 months). The former events trigger shallow translational slides while the later episodes are usually associated with deeper and larger slope movements. This second group of landslides is shown to be statistically associated with the 3-month average of the NAO index. |
author2 |
Centro de Estudos Geográficos CGUL Departamento de Engenharias Instituto de Meteorologia |
format |
Article in Journal/Newspaper |
author |
Zêzere, J. L. Trigo, R. M. Trigo, I. F. |
author_facet |
Zêzere, J. L. Trigo, R. M. Trigo, I. F. |
author_sort |
Zêzere, J. L. |
title |
Shallow and deep landslides induced by rainfall in the Lisbon region (Portugal): assessment of relationships with the North Atlantic Oscillation |
title_short |
Shallow and deep landslides induced by rainfall in the Lisbon region (Portugal): assessment of relationships with the North Atlantic Oscillation |
title_full |
Shallow and deep landslides induced by rainfall in the Lisbon region (Portugal): assessment of relationships with the North Atlantic Oscillation |
title_fullStr |
Shallow and deep landslides induced by rainfall in the Lisbon region (Portugal): assessment of relationships with the North Atlantic Oscillation |
title_full_unstemmed |
Shallow and deep landslides induced by rainfall in the Lisbon region (Portugal): assessment of relationships with the North Atlantic Oscillation |
title_sort |
shallow and deep landslides induced by rainfall in the lisbon region (portugal): assessment of relationships with the north atlantic oscillation |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.archives-ouvertes.fr/hal-00299181 https://hal.archives-ouvertes.fr/hal-00299181/document https://hal.archives-ouvertes.fr/hal-00299181/file/nhess-5-331-2005.pdf |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
ISSN: 1561-8633 EISSN: 1684-9981 Natural Hazards and Earth System Sciences https://hal.archives-ouvertes.fr/hal-00299181 Natural Hazards and Earth System Sciences, Copernicus Publ. / European Geosciences Union, 2005, 5 (3), pp.331-344 |
op_relation |
hal-00299181 https://hal.archives-ouvertes.fr/hal-00299181 https://hal.archives-ouvertes.fr/hal-00299181/document https://hal.archives-ouvertes.fr/hal-00299181/file/nhess-5-331-2005.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766124527552561152 |