Neoglacial increase in high-magnitude glacial lake outburst flood frequency (Baker River, Patagonia, 47°S)

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dc.contributor.authorBertrand, Sen_AU
dc.contributor.authorVandekerkhove, Een_AU
dc.contributor.authorMauquoy, Den_AU
dc.contributor.authorMcWethy, Den_AU
dc.contributor.authorReid, Ben_AU
dc.contributor.authorStammen, Sen_AU
dc.contributor.authorSaunders, KMen_AU
dc.contributor.authorTorrejón, Fen_AU
dc.date.accessioned2023-03-29T22:34:25Zen_AU
dc.date.available2023-03-29T22:34:25Zen_AU
dc.date.issued2021-04-19en_AU
dc.date.statistics2023-03-27en_AU
dc.description.abstractGlacial Lake Outburst Floods (GLOFs) constitute a major hazard in periglacial environments. Despite a recent increase in the size and number of glacial lakes worldwide, there is only limited evidence that climate change is affecting GLOF frequency. In Patagonia, GLOFs are particularly common in the Baker River watershed (47°S), where 21 GLOFs occurred between 2008 and 2017 due to the drainage of Cachet 2 Lake into the Colonia River, a tributary of the Baker River. During these GLOFs, the increased discharge from the Colonia River blocks the regular flow of the Baker River, resulting in the inundation of the Valle Grande floodplain, which is located approximately 4 km upstream of the confluence. To assess the possible long-term relationship between GLOF frequency, glacier behavior, and climate variability, four sediment cores collected in the Valle Grande floodplain were analyzed. Their geophysical and sedimentological properties were examined, and radiocarbon-based age-depth models were constructed. All cores consist of dense, fine-grained, organic-poor material alternating with low-density organic-rich deposits. The percentage of lithogenic particles, which were most likely deposited during high-magnitude GLOFs, was used to reconstruct the flood history of the last 2.75 kyr. Results show increased flood activity between 2.57 and 2.17 cal kyr BP, and between 0.75 and 0 cal kyr BP. These two periods coincide with glacier advances during the Neoglaciation. Our results suggest that GLOFs are not a new phenomenon in the region. Although rapid glacier retreat is likely responsible for high GLOF frequency in the 21st century, high-magnitude GLOFs seem to occur more frequently when glaciers are larger and thicker.en_AU
dc.identifier.citationBertrand, S., Vandekerkhove, E., Mauquoy, D., McWethy, D., Reid, B., Stammen, S., Saunders, K., and Torrejon, F. (2021). Neoglacial increase in high-magnitude glacial lake outburst flood frequency (Baker River, Patagonia, 47°S). Paper presented to the EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-14687. Retrieved from: https://doi.org/10.5194/egusphere-egu21-14687en_AU
dc.identifier.conferenceenddate30 April 2021en_AU
dc.identifier.conferencenameEGU General Assembly 2021en_AU
dc.identifier.conferenceplaceOnlineen_AU
dc.identifier.conferencestartdate19 April 2021en_AU
dc.identifier.otherEGU21-14687en_AU
dc.identifier.urihttps://doi.org/10.5194/egusphere-egu21-14687en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14753en_AU
dc.language.isoenen_AU
dc.publisherCopernicus GmbHen_AU
dc.subjectHazardsen_AU
dc.subjectEnvironmenten_AU
dc.subjectClimatesen_AU
dc.subjectRiversen_AU
dc.subjectWatershedsen_AU
dc.subjectDrainageen_AU
dc.subjectFloodsen_AU
dc.subjectDepositsen_AU
dc.titleNeoglacial increase in high-magnitude glacial lake outburst flood frequency (Baker River, Patagonia, 47°S)en_AU
dc.typeConference Paperen_AU
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