Shallow and deep landslides induced by rainfall in the Lisbon region (Portugal): assessment of relationships with the North Atlantic Oscillation
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...
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ftunivlisboa:oai:repositorio.ul.pt:10451/37012 2023-05-15T17:28:34+02:00 Shallow and deep landslides induced by rainfall in the Lisbon region (Portugal): assessment of relationships with the North Atlantic Oscillation Zêzere, José Trigo, R. M. Trigo, I. F. 2019-02-14T16:32:06Z http://hdl.handle.net/10451/37012 https://doi.org/10.5194/nhess-5-331-2005 eng eng Copernicus Publications https://www.nat-hazards-earth-syst-sci.net/5/331/2005/nhess-5-331-2005.pdf Zezere, J. L., Trigo, R. M., Trigo, I. F. (2005). Shallow and deep landslides induced by rainfall in the Lisbon region (Portugal): assessment of relationships with the North Atlantic Oscillation. Natural Hazards and Earth System Sciences, 5(3), pp. 331–344. https://doi.org/10.5194/nhess-5-331-2005 1561-8633 1684-9981 http://hdl.handle.net/10451/37012 doi:10.5194/nhess-5-331-2005 openAccess http://creativecommons.org/licenses/by/4.0/ CC-BY Landslides Debris flows North Atlantic Oscillation Rainfall Lisbon Portugal article 2019 ftunivlisboa https://doi.org/10.5194/nhess-5-331-2005 2022-05-25T18:39:21Z 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. info:eu-repo/semantics/publishedVersion Article in Journal/Newspaper North Atlantic North Atlantic oscillation Universidade de Lisboa: repositório.UL Natural Hazards and Earth System Sciences 5 3 331 344 |
institution |
Open Polar |
collection |
Universidade de Lisboa: repositório.UL |
op_collection_id |
ftunivlisboa |
language |
English |
topic |
Landslides Debris flows North Atlantic Oscillation Rainfall Lisbon Portugal |
spellingShingle |
Landslides Debris flows North Atlantic Oscillation Rainfall Lisbon Portugal Zêzere, José 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 |
Landslides Debris flows North Atlantic Oscillation Rainfall Lisbon Portugal |
description |
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. info:eu-repo/semantics/publishedVersion |
format |
Article in Journal/Newspaper |
author |
Zêzere, José Trigo, R. M. Trigo, I. F. |
author_facet |
Zêzere, José Trigo, R. M. Trigo, I. F. |
author_sort |
Zêzere, José |
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 |
Copernicus Publications |
publishDate |
2019 |
url |
http://hdl.handle.net/10451/37012 https://doi.org/10.5194/nhess-5-331-2005 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
https://www.nat-hazards-earth-syst-sci.net/5/331/2005/nhess-5-331-2005.pdf Zezere, J. L., Trigo, R. M., Trigo, I. F. (2005). Shallow and deep landslides induced by rainfall in the Lisbon region (Portugal): assessment of relationships with the North Atlantic Oscillation. Natural Hazards and Earth System Sciences, 5(3), pp. 331–344. https://doi.org/10.5194/nhess-5-331-2005 1561-8633 1684-9981 http://hdl.handle.net/10451/37012 doi:10.5194/nhess-5-331-2005 |
op_rights |
openAccess http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/nhess-5-331-2005 |
container_title |
Natural Hazards and Earth System Sciences |
container_volume |
5 |
container_issue |
3 |
container_start_page |
331 |
op_container_end_page |
344 |
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1766121326917976064 |