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Title: Declining discharge of glacier outburst floods through the Holocene in central Patagonia
Authors: Benito, Gerardo
Thorndycraft, Varyl R.
Medialdea, Alicia
Machado, María José ‎
Sancho Marcén, Carlos
Dussaillant, Alejandro
Keywords: Geomorphology;GLOFs;Palaeohydrology;Palaeosols;South America
Issue Date: Mar-2021
Publisher: Elsevier
Citation: Quaternary Science Reviews, 2021, 256, 106810
Abstract: 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.
ISSN: 0277-3791
DOI: 10.1016/j.quascirev.2021.106810
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Type: Article
Appears in Collections:Datación por Luminiscencia
Geocronología y Geología

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