Dendrogeomorphology of the avulsion event on the Pedregoso Creek alluvial fan (Argentina, Puelo Lake) triggered by the historic 1960 earthquake

Autores
Quesada, Agustín; Amoroso, Mariano Martin; Bistolfi, Nicolás Martín
Año de publicación
2022
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
The most intense earthquake worldwide ever measured occurred in Valdivia, Chile, in May 1960. Its ocurrence resulted in ecosystem´s impacts on the Argentine Andean region in northwest Patagonia during and after the event. A known case is the Tsunami in Lake Nahuel Huapi that destroyed the Bariloche port. On the other hand, less is known about the Pedregoso Creek (PC) flood in the north bayhead of the Puelo Lake. Historical local farmers who used to cross the PC recall that after the quake, small natural water bodies placed in the middle basin got undammed leading to a big flood in the lower basin. As a result, a channel avulsión took place in the PC alluvial fan and the location of its rivermouth changed drastically. Nowadays, the flood and the avulsion event is still recognizable in the alluvial fan due to a lower forest density that had slowly reestablished on the paleochannel sector. With this framework, we are conducting dendrogeomorphological studies in the alluvial fan in order to characterize the event, explore other conditions present during 1960th (e.g. above average subsequent migration dynamics. For this purpose, we estimated forest density (tree/ha) and took increment core samples at multiple sampling points (distanciated 50 m) along three arcuate transects that radially dissect all the Predregoso alluvial fan. After the land survey,we zonificated the alluvial fan in six different sectors. The sectors were characterized by theforest maximum density value and the minimum potential tree establishment date ofthe last fluvial activity (oldest dated tree established), as follow: 1) the active PC channelwith no trees; 2) a fluvial semi-active sector with 152 trees per ha and a minimal establishment date of 1987; 3) a fluvial inactive zone with 962 trees per ha and an establishment date of 1967; 4) the paleochannel sector, active before the earthquake and the flood events, with 337 trees per ha and an establishment date of 1973; 5) a paleochannel middle fluvial bar sector, with 429 trees per haand an establishment date of 1963, and finally; 6) an undisturbed forest sector with 1975 treesper ha and an establishment date of 1832. These results, with no intermediate dated sectorbetween the undisturbed (1832) and the paleochannel (1963) sectors, may preliminary suggest that the avulsión event was unique over the last two centuries. The younger sectors (2 and 3) are eflecting a gradual channel migration to the north side of the alluvial fan after the avulsion. Future work will continue surveying higher areas of the basin looking for lost small water bodies (damms), directed dendrogeomophological sampling to reinforce the dating of the avulsion event and, lastly,analyzing instrumental climatic data to establish whether the earthquake took place on a wet year resulting in an increased level of the Puelo Lake.
Fil: Quesada, Agustín. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Patagonia Norte. Instituto de Investigaciones En Recursos Naturales, Agroecologia y Desarrollo Rural. - Universidad Nacional de Rio Negro. Instituto de Investigaciones En Recursos Naturales, Agroecologia y Desarrollo Rural.; Argentina
Fil: Amoroso, Mariano Martin. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Patagonia Norte. Instituto de Investigaciones En Recursos Naturales, Agroecologia y Desarrollo Rural. - Universidad Nacional de Rio Negro. Instituto de Investigaciones En Recursos Naturales, Agroecologia y Desarrollo Rural.; Argentina
Fil: Bistolfi, Nicolás Martín. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Patagonia Norte. Instituto de Investigaciones En Recursos Naturales, Agroecologia y Desarrollo Rural. - Universidad Nacional de Rio Negro. Instituto de Investigaciones En Recursos Naturales, Agroecologia y Desarrollo Rural.; Argentina
6th Past Global Changes Open Science Meeting
Agadir
Marruecos
Past Global Changes
Materia
PATAGONIA
ANDEAN RANGE
FLUVIAL DENDROGEOMORFOLOGY
CHANNEL
FLOOD
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/217838

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spelling Dendrogeomorphology of the avulsion event on the Pedregoso Creek alluvial fan (Argentina, Puelo Lake) triggered by the historic 1960 earthquakeQuesada, AgustínAmoroso, Mariano MartinBistolfi, Nicolás MartínPATAGONIAANDEAN RANGEFLUVIAL DENDROGEOMORFOLOGYCHANNELFLOODhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The most intense earthquake worldwide ever measured occurred in Valdivia, Chile, in May 1960. Its ocurrence resulted in ecosystem´s impacts on the Argentine Andean region in northwest Patagonia during and after the event. A known case is the Tsunami in Lake Nahuel Huapi that destroyed the Bariloche port. On the other hand, less is known about the Pedregoso Creek (PC) flood in the north bayhead of the Puelo Lake. Historical local farmers who used to cross the PC recall that after the quake, small natural water bodies placed in the middle basin got undammed leading to a big flood in the lower basin. As a result, a channel avulsión took place in the PC alluvial fan and the location of its rivermouth changed drastically. Nowadays, the flood and the avulsion event is still recognizable in the alluvial fan due to a lower forest density that had slowly reestablished on the paleochannel sector. With this framework, we are conducting dendrogeomorphological studies in the alluvial fan in order to characterize the event, explore other conditions present during 1960th (e.g. above average subsequent migration dynamics. For this purpose, we estimated forest density (tree/ha) and took increment core samples at multiple sampling points (distanciated 50 m) along three arcuate transects that radially dissect all the Predregoso alluvial fan. After the land survey,we zonificated the alluvial fan in six different sectors. The sectors were characterized by theforest maximum density value and the minimum potential tree establishment date ofthe last fluvial activity (oldest dated tree established), as follow: 1) the active PC channelwith no trees; 2) a fluvial semi-active sector with 152 trees per ha and a minimal establishment date of 1987; 3) a fluvial inactive zone with 962 trees per ha and an establishment date of 1967; 4) the paleochannel sector, active before the earthquake and the flood events, with 337 trees per ha and an establishment date of 1973; 5) a paleochannel middle fluvial bar sector, with 429 trees per haand an establishment date of 1963, and finally; 6) an undisturbed forest sector with 1975 treesper ha and an establishment date of 1832. These results, with no intermediate dated sectorbetween the undisturbed (1832) and the paleochannel (1963) sectors, may preliminary suggest that the avulsión event was unique over the last two centuries. The younger sectors (2 and 3) are eflecting a gradual channel migration to the north side of the alluvial fan after the avulsion. Future work will continue surveying higher areas of the basin looking for lost small water bodies (damms), directed dendrogeomophological sampling to reinforce the dating of the avulsion event and, lastly,analyzing instrumental climatic data to establish whether the earthquake took place on a wet year resulting in an increased level of the Puelo Lake.Fil: Quesada, Agustín. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Patagonia Norte. Instituto de Investigaciones En Recursos Naturales, Agroecologia y Desarrollo Rural. - Universidad Nacional de Rio Negro. Instituto de Investigaciones En Recursos Naturales, Agroecologia y Desarrollo Rural.; ArgentinaFil: Amoroso, Mariano Martin. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Patagonia Norte. Instituto de Investigaciones En Recursos Naturales, Agroecologia y Desarrollo Rural. - Universidad Nacional de Rio Negro. Instituto de Investigaciones En Recursos Naturales, Agroecologia y Desarrollo Rural.; ArgentinaFil: Bistolfi, Nicolás Martín. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Patagonia Norte. Instituto de Investigaciones En Recursos Naturales, Agroecologia y Desarrollo Rural. - Universidad Nacional de Rio Negro. Instituto de Investigaciones En Recursos Naturales, Agroecologia y Desarrollo Rural.; Argentina6th Past Global Changes Open Science MeetingAgadirMarruecosPast Global ChangesPast Global Changes2022info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectReuniónBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/217838Dendrogeomorphology of the avulsion event on the Pedregoso Creek alluvial fan (Argentina, Puelo Lake) triggered by the historic 1960 earthquake; 6th Past Global Changes Open Science Meeting; Agadir; Marruecos; 2022; 119-120CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://pages-osm.org/images/archive_osm_ysm/osm6/Abstract_Book_-_PAGES2022-30_04_2022.pdfInternacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:10:35Zoai:ri.conicet.gov.ar:11336/217838instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:10:35.863CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Dendrogeomorphology of the avulsion event on the Pedregoso Creek alluvial fan (Argentina, Puelo Lake) triggered by the historic 1960 earthquake
title Dendrogeomorphology of the avulsion event on the Pedregoso Creek alluvial fan (Argentina, Puelo Lake) triggered by the historic 1960 earthquake
spellingShingle Dendrogeomorphology of the avulsion event on the Pedregoso Creek alluvial fan (Argentina, Puelo Lake) triggered by the historic 1960 earthquake
Quesada, Agustín
PATAGONIA
ANDEAN RANGE
FLUVIAL DENDROGEOMORFOLOGY
CHANNEL
FLOOD
title_short Dendrogeomorphology of the avulsion event on the Pedregoso Creek alluvial fan (Argentina, Puelo Lake) triggered by the historic 1960 earthquake
title_full Dendrogeomorphology of the avulsion event on the Pedregoso Creek alluvial fan (Argentina, Puelo Lake) triggered by the historic 1960 earthquake
title_fullStr Dendrogeomorphology of the avulsion event on the Pedregoso Creek alluvial fan (Argentina, Puelo Lake) triggered by the historic 1960 earthquake
title_full_unstemmed Dendrogeomorphology of the avulsion event on the Pedregoso Creek alluvial fan (Argentina, Puelo Lake) triggered by the historic 1960 earthquake
title_sort Dendrogeomorphology of the avulsion event on the Pedregoso Creek alluvial fan (Argentina, Puelo Lake) triggered by the historic 1960 earthquake
dc.creator.none.fl_str_mv Quesada, Agustín
Amoroso, Mariano Martin
Bistolfi, Nicolás Martín
author Quesada, Agustín
author_facet Quesada, Agustín
Amoroso, Mariano Martin
Bistolfi, Nicolás Martín
author_role author
author2 Amoroso, Mariano Martin
Bistolfi, Nicolás Martín
author2_role author
author
dc.subject.none.fl_str_mv PATAGONIA
ANDEAN RANGE
FLUVIAL DENDROGEOMORFOLOGY
CHANNEL
FLOOD
topic PATAGONIA
ANDEAN RANGE
FLUVIAL DENDROGEOMORFOLOGY
CHANNEL
FLOOD
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The most intense earthquake worldwide ever measured occurred in Valdivia, Chile, in May 1960. Its ocurrence resulted in ecosystem´s impacts on the Argentine Andean region in northwest Patagonia during and after the event. A known case is the Tsunami in Lake Nahuel Huapi that destroyed the Bariloche port. On the other hand, less is known about the Pedregoso Creek (PC) flood in the north bayhead of the Puelo Lake. Historical local farmers who used to cross the PC recall that after the quake, small natural water bodies placed in the middle basin got undammed leading to a big flood in the lower basin. As a result, a channel avulsión took place in the PC alluvial fan and the location of its rivermouth changed drastically. Nowadays, the flood and the avulsion event is still recognizable in the alluvial fan due to a lower forest density that had slowly reestablished on the paleochannel sector. With this framework, we are conducting dendrogeomorphological studies in the alluvial fan in order to characterize the event, explore other conditions present during 1960th (e.g. above average subsequent migration dynamics. For this purpose, we estimated forest density (tree/ha) and took increment core samples at multiple sampling points (distanciated 50 m) along three arcuate transects that radially dissect all the Predregoso alluvial fan. After the land survey,we zonificated the alluvial fan in six different sectors. The sectors were characterized by theforest maximum density value and the minimum potential tree establishment date ofthe last fluvial activity (oldest dated tree established), as follow: 1) the active PC channelwith no trees; 2) a fluvial semi-active sector with 152 trees per ha and a minimal establishment date of 1987; 3) a fluvial inactive zone with 962 trees per ha and an establishment date of 1967; 4) the paleochannel sector, active before the earthquake and the flood events, with 337 trees per ha and an establishment date of 1973; 5) a paleochannel middle fluvial bar sector, with 429 trees per haand an establishment date of 1963, and finally; 6) an undisturbed forest sector with 1975 treesper ha and an establishment date of 1832. These results, with no intermediate dated sectorbetween the undisturbed (1832) and the paleochannel (1963) sectors, may preliminary suggest that the avulsión event was unique over the last two centuries. The younger sectors (2 and 3) are eflecting a gradual channel migration to the north side of the alluvial fan after the avulsion. Future work will continue surveying higher areas of the basin looking for lost small water bodies (damms), directed dendrogeomophological sampling to reinforce the dating of the avulsion event and, lastly,analyzing instrumental climatic data to establish whether the earthquake took place on a wet year resulting in an increased level of the Puelo Lake.
Fil: Quesada, Agustín. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Patagonia Norte. Instituto de Investigaciones En Recursos Naturales, Agroecologia y Desarrollo Rural. - Universidad Nacional de Rio Negro. Instituto de Investigaciones En Recursos Naturales, Agroecologia y Desarrollo Rural.; Argentina
Fil: Amoroso, Mariano Martin. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Patagonia Norte. Instituto de Investigaciones En Recursos Naturales, Agroecologia y Desarrollo Rural. - Universidad Nacional de Rio Negro. Instituto de Investigaciones En Recursos Naturales, Agroecologia y Desarrollo Rural.; Argentina
Fil: Bistolfi, Nicolás Martín. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Patagonia Norte. Instituto de Investigaciones En Recursos Naturales, Agroecologia y Desarrollo Rural. - Universidad Nacional de Rio Negro. Instituto de Investigaciones En Recursos Naturales, Agroecologia y Desarrollo Rural.; Argentina
6th Past Global Changes Open Science Meeting
Agadir
Marruecos
Past Global Changes
description The most intense earthquake worldwide ever measured occurred in Valdivia, Chile, in May 1960. Its ocurrence resulted in ecosystem´s impacts on the Argentine Andean region in northwest Patagonia during and after the event. A known case is the Tsunami in Lake Nahuel Huapi that destroyed the Bariloche port. On the other hand, less is known about the Pedregoso Creek (PC) flood in the north bayhead of the Puelo Lake. Historical local farmers who used to cross the PC recall that after the quake, small natural water bodies placed in the middle basin got undammed leading to a big flood in the lower basin. As a result, a channel avulsión took place in the PC alluvial fan and the location of its rivermouth changed drastically. Nowadays, the flood and the avulsion event is still recognizable in the alluvial fan due to a lower forest density that had slowly reestablished on the paleochannel sector. With this framework, we are conducting dendrogeomorphological studies in the alluvial fan in order to characterize the event, explore other conditions present during 1960th (e.g. above average subsequent migration dynamics. For this purpose, we estimated forest density (tree/ha) and took increment core samples at multiple sampling points (distanciated 50 m) along three arcuate transects that radially dissect all the Predregoso alluvial fan. After the land survey,we zonificated the alluvial fan in six different sectors. The sectors were characterized by theforest maximum density value and the minimum potential tree establishment date ofthe last fluvial activity (oldest dated tree established), as follow: 1) the active PC channelwith no trees; 2) a fluvial semi-active sector with 152 trees per ha and a minimal establishment date of 1987; 3) a fluvial inactive zone with 962 trees per ha and an establishment date of 1967; 4) the paleochannel sector, active before the earthquake and the flood events, with 337 trees per ha and an establishment date of 1973; 5) a paleochannel middle fluvial bar sector, with 429 trees per haand an establishment date of 1963, and finally; 6) an undisturbed forest sector with 1975 treesper ha and an establishment date of 1832. These results, with no intermediate dated sectorbetween the undisturbed (1832) and the paleochannel (1963) sectors, may preliminary suggest that the avulsión event was unique over the last two centuries. The younger sectors (2 and 3) are eflecting a gradual channel migration to the north side of the alluvial fan after the avulsion. Future work will continue surveying higher areas of the basin looking for lost small water bodies (damms), directed dendrogeomophological sampling to reinforce the dating of the avulsion event and, lastly,analyzing instrumental climatic data to establish whether the earthquake took place on a wet year resulting in an increased level of the Puelo Lake.
publishDate 2022
dc.date.none.fl_str_mv 2022
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status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/217838
Dendrogeomorphology of the avulsion event on the Pedregoso Creek alluvial fan (Argentina, Puelo Lake) triggered by the historic 1960 earthquake; 6th Past Global Changes Open Science Meeting; Agadir; Marruecos; 2022; 119-120
CONICET Digital
CONICET
url http://hdl.handle.net/11336/217838
identifier_str_mv Dendrogeomorphology of the avulsion event on the Pedregoso Creek alluvial fan (Argentina, Puelo Lake) triggered by the historic 1960 earthquake; 6th Past Global Changes Open Science Meeting; Agadir; Marruecos; 2022; 119-120
CONICET Digital
CONICET
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