Description and analysis of the debris flows occurred during 2008 in the Eastern Pyrenees

Rainfall-triggered landslides taking place in the Spanish Eastern Pyrenees have usually been analysed on a regional scale. Most research focussed either on terrain susceptibility or on the characteristics of the critical rainfall, neglecting a detailed analysis of individual events. In contrast to o...

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Autores: Portilla, Modesto, Chevalier, Guillaume Gerard, Hurlimann Ziegler, Marcel|||0000-0003-0119-1438
Tipo de recurso: artículo
Fecha de publicación:2010
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/10131
Acceso en línea:https://hdl.handle.net/2117/10131
https://dx.doi.org/10.5194/nhess-10-1635-2010
Access Level:acceso abierto
Palabra clave:Pyrenees
Debris avalanches
Esllavissades -- Pirineus
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Riscos geològics
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spelling Description and analysis of the debris flows occurred during 2008 in the Eastern PyreneesPortilla, ModestoChevalier, Guillaume GerardHurlimann Ziegler, Marcel|||0000-0003-0119-1438PyreneesDebris avalanchesEsllavissades -- PirineusÀrees temàtiques de la UPC::Enginyeria civil::Geologia::Riscos geològicsRainfall-triggered landslides taking place in the Spanish Eastern Pyrenees have usually been analysed on a regional scale. Most research focussed either on terrain susceptibility or on the characteristics of the critical rainfall, neglecting a detailed analysis of individual events. In contrast to other mountainous regions, research on debris flow has only been performed marginally and associated hazard has mostly been neglected. In this study, five debris flows, which occurred in 2008, are selected; and site specific descriptions and analysis regarding geology, morphology, rainfall data and runout were performed. The results are compared with worldwide data and some conclusions on hazard assessment are presented. The five events can be divided into two in-channel debris flows and three landslide-triggered debris flows. The inchannel generated debris flows exceeded 10 000m3, which are unusually large mass movements compared to historic events which occurred in the Eastern Pyrenees. In contrast, the other events mobilised total volumes less than 2000m3. The geomorphologic analysis showed that the studied events emphasize similar patterns when compared to published data focussing on slope angle in the initiation zone or catchment area. Rainfall data revealed that all debris flows were triggered by high intensity-short duration rainstorms during the summer season. Unfortunately, existing rainfall thresholds in the Eastern Pyrenees consider long-lasting rainfall, usually occurring in autumn/winter. Therefore, new thresholds should be established taking into account the rainfall peak intensity in mm/h, which seems to be a much more relevant factor for summer than the event’s total precipitation. The runout analysis of the 2008 debris flows confirms the trend that larger volumes generally induce higher mobility. The numerical simulation of the Riu Runer event shows that its dynamic behaviour is well represented by Voellmy fluid rheology. A maximum front velocity of 7 m/s was backanalysed for the transit section and even on the fan velocities larger than 2 m/s were obtained. This preliminary analysis of the major Eastern Pyrenean debris flows represents the first background for future studies. Additional research on other events is necessary to support the results presented herein, and to properly assess and reduce hazard related to debris flows.Peer Reviewed20102010-01-0120102010-11-04journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/10131https://dx.doi.org/10.5194/nhess-10-1635-2010reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)InglésengEuropean Commission http://dx.doi.org/10.13039/100011102 Seventh Framework Programme 226555 IMproving Preparedness and RIsk maNagemenT for flash floods and debriS flow eventsopen accesshttp://purl.org/coar/access_right/c_abf2Attribution 3.0 Spainhttp://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/101312026-05-27T15:37:01Z
dc.title.none.fl_str_mv Description and analysis of the debris flows occurred during 2008 in the Eastern Pyrenees
title Description and analysis of the debris flows occurred during 2008 in the Eastern Pyrenees
spellingShingle Description and analysis of the debris flows occurred during 2008 in the Eastern Pyrenees
Portilla, Modesto
Pyrenees
Debris avalanches
Esllavissades -- Pirineus
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Riscos geològics
title_short Description and analysis of the debris flows occurred during 2008 in the Eastern Pyrenees
title_full Description and analysis of the debris flows occurred during 2008 in the Eastern Pyrenees
title_fullStr Description and analysis of the debris flows occurred during 2008 in the Eastern Pyrenees
title_full_unstemmed Description and analysis of the debris flows occurred during 2008 in the Eastern Pyrenees
title_sort Description and analysis of the debris flows occurred during 2008 in the Eastern Pyrenees
dc.creator.none.fl_str_mv Portilla, Modesto
Chevalier, Guillaume Gerard
Hurlimann Ziegler, Marcel|||0000-0003-0119-1438
author Portilla, Modesto
author_facet Portilla, Modesto
Chevalier, Guillaume Gerard
Hurlimann Ziegler, Marcel|||0000-0003-0119-1438
author_role author
author2 Chevalier, Guillaume Gerard
Hurlimann Ziegler, Marcel|||0000-0003-0119-1438
author2_role author
author
dc.subject.none.fl_str_mv Pyrenees
Debris avalanches
Esllavissades -- Pirineus
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Riscos geològics
topic Pyrenees
Debris avalanches
Esllavissades -- Pirineus
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Riscos geològics
description Rainfall-triggered landslides taking place in the Spanish Eastern Pyrenees have usually been analysed on a regional scale. Most research focussed either on terrain susceptibility or on the characteristics of the critical rainfall, neglecting a detailed analysis of individual events. In contrast to other mountainous regions, research on debris flow has only been performed marginally and associated hazard has mostly been neglected. In this study, five debris flows, which occurred in 2008, are selected; and site specific descriptions and analysis regarding geology, morphology, rainfall data and runout were performed. The results are compared with worldwide data and some conclusions on hazard assessment are presented. The five events can be divided into two in-channel debris flows and three landslide-triggered debris flows. The inchannel generated debris flows exceeded 10 000m3, which are unusually large mass movements compared to historic events which occurred in the Eastern Pyrenees. In contrast, the other events mobilised total volumes less than 2000m3. The geomorphologic analysis showed that the studied events emphasize similar patterns when compared to published data focussing on slope angle in the initiation zone or catchment area. Rainfall data revealed that all debris flows were triggered by high intensity-short duration rainstorms during the summer season. Unfortunately, existing rainfall thresholds in the Eastern Pyrenees consider long-lasting rainfall, usually occurring in autumn/winter. Therefore, new thresholds should be established taking into account the rainfall peak intensity in mm/h, which seems to be a much more relevant factor for summer than the event’s total precipitation. The runout analysis of the 2008 debris flows confirms the trend that larger volumes generally induce higher mobility. The numerical simulation of the Riu Runer event shows that its dynamic behaviour is well represented by Voellmy fluid rheology. A maximum front velocity of 7 m/s was backanalysed for the transit section and even on the fan velocities larger than 2 m/s were obtained. This preliminary analysis of the major Eastern Pyrenean debris flows represents the first background for future studies. Additional research on other events is necessary to support the results presented herein, and to properly assess and reduce hazard related to debris flows.
publishDate 2010
dc.date.none.fl_str_mv 2010
2010-01-01
2010
2010-11-04
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/10131
https://dx.doi.org/10.5194/nhess-10-1635-2010
url https://hdl.handle.net/2117/10131
https://dx.doi.org/10.5194/nhess-10-1635-2010
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv European Commission http://dx.doi.org/10.13039/100011102 Seventh Framework Programme 226555 IMproving Preparedness and RIsk maNagemenT for flash floods and debriS flow events
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 3.0 Spain
http://creativecommons.org/licenses/by/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 3.0 Spain
http://creativecommons.org/licenses/by/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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