Declining discharge of glacier outburst floods through the Holocene in central Patagonia

Glacier outburst floods are a major hazard in glacierized catchments. Global analyses have shown reduced frequency of glacier floods over recent decades but there is limited longer-term data on event magnitude and frequency. Here, we present a Holocene palaeoflood record from the Río Baker (Chilean...

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Autores: Benito, G., Thorndycraft, V.R., Medialdea, A., Machado, M.J., Sancho, C., Dussaillant, A.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2021
País:España
Institución:Universidad de Zaragoza
Repositorio:Zaguán. Repositorio Digital de la Universidad de Zaragoza
OAI Identifier:oai:zaguan.unizar.es:151312
Acceso en línea:http://zaguan.unizar.es/record/151312
Access Level:acceso abierto
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spelling Declining discharge of glacier outburst floods through the Holocene in central PatagoniaBenito, G.Thorndycraft, V.R.Medialdea, A.Machado, M.J.Sancho, C.Dussaillant, A.Glacier outburst floods are a major hazard in glacierized catchments. Global analyses have shown reduced frequency of glacier floods over recent decades but there is limited longer-term data on event magnitude and frequency. Here, we present a Holocene palaeoflood record from the Río Baker (Chilean Patagonia), quantifying the discharge and timing of glacier floods over millennial timescales. A catastrophic flood of 110, 000 m3/s (0.11 Sv) occurred at 9.6 ± 0.8 ka, during final stages of the Late Glacial Interglacial Transition, followed by five flood-phases coeval or post-dating Holocene neoglacials. Highest flood frequencies occurred at 4.3–4.4 ka, with 26 floods of minimum discharges of 10, 000–11, 000 m3/s, and 0.6 ka with 10 floods exceeding 4600–5700 m3/s. The largest modern outburst flood recorded surpassed ~3810 m3/s. Thus glacier flood magnitude declines from the order of 0.1 to 0.01 Sv over the Early to Mid Holocene, and to 0.001 Sv in the instrumental record.2021info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://zaguan.unizar.es/record/151312reponame:Zaguán. Repositorio Digital de la Universidad de Zaragozainstname:Universidad de ZaragozaInglésinfo:eu-repo/semantics/openAccessoai:zaguan.unizar.es:1513122026-05-29T13:59:51Z
dc.title.none.fl_str_mv Declining discharge of glacier outburst floods through the Holocene in central Patagonia
title Declining discharge of glacier outburst floods through the Holocene in central Patagonia
spellingShingle Declining discharge of glacier outburst floods through the Holocene in central Patagonia
Benito, G.
title_short Declining discharge of glacier outburst floods through the Holocene in central Patagonia
title_full Declining discharge of glacier outburst floods through the Holocene in central Patagonia
title_fullStr Declining discharge of glacier outburst floods through the Holocene in central Patagonia
title_full_unstemmed Declining discharge of glacier outburst floods through the Holocene in central Patagonia
title_sort Declining discharge of glacier outburst floods through the Holocene in central Patagonia
dc.creator.none.fl_str_mv Benito, G.
Thorndycraft, V.R.
Medialdea, A.
Machado, M.J.
Sancho, C.
Dussaillant, A.
author Benito, G.
author_facet Benito, G.
Thorndycraft, V.R.
Medialdea, A.
Machado, M.J.
Sancho, C.
Dussaillant, A.
author_role author
author2 Thorndycraft, V.R.
Medialdea, A.
Machado, M.J.
Sancho, C.
Dussaillant, A.
author2_role author
author
author
author
author
description Glacier outburst floods are a major hazard in glacierized catchments. Global analyses have shown reduced frequency of glacier floods over recent decades but there is limited longer-term data on event magnitude and frequency. Here, we present a Holocene palaeoflood record from the Río Baker (Chilean Patagonia), quantifying the discharge and timing of glacier floods over millennial timescales. A catastrophic flood of 110, 000 m3/s (0.11 Sv) occurred at 9.6 ± 0.8 ka, during final stages of the Late Glacial Interglacial Transition, followed by five flood-phases coeval or post-dating Holocene neoglacials. Highest flood frequencies occurred at 4.3–4.4 ka, with 26 floods of minimum discharges of 10, 000–11, 000 m3/s, and 0.6 ka with 10 floods exceeding 4600–5700 m3/s. The largest modern outburst flood recorded surpassed ~3810 m3/s. Thus glacier flood magnitude declines from the order of 0.1 to 0.01 Sv over the Early to Mid Holocene, and to 0.001 Sv in the instrumental record.
publishDate 2021
dc.date.none.fl_str_mv 2021
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dc.identifier.none.fl_str_mv http://zaguan.unizar.es/record/151312
url http://zaguan.unizar.es/record/151312
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.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
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dc.source.none.fl_str_mv reponame:Zaguán. Repositorio Digital de la Universidad de Zaragoza
instname:Universidad de Zaragoza
instname_str Universidad de Zaragoza
reponame_str Zaguán. Repositorio Digital de la Universidad de Zaragoza
collection Zaguán. Repositorio Digital de la Universidad de Zaragoza
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score 15,811543

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