Paleo-GLOFs

Assessing the impact of climate change on the frequency of Glacial Lake Outburst Floods in Patagonia

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Project outline

Glacial Lake Outburst Floods (GLOFs) constitute a major threat in glacierized regions. They cause considerable damage to infrastructure and frequently result in the loss of livestock and human lives. Although the frequency and magnitude of GLOFs seem to have increased worldwide in the last decades, there is currently no reliable scientific evidence supporting this claim, largely due to a lack of flood records on timescales that extend beyond gauged river-flow datasets. This issue is particularly pronounced in Patagonia, where 15 GLOFs were documented between 2008 and 2014. During these events, the discharge of Baker river, which drains most of the eastern side of the Northern Patagonian Icefield, increases from 500-1000 m3/sec to >3000 m3/sec, and river water level rises by 4-6 m.

GLOF ICE AGE

This project investigates changes in GLOF frequency during the late Holocene (the last ~3000 years) by studying flood deposits recorded in the sediments of Baker fjord, and in elevated lakes and peatbogs along Baker river. In addition, sediment traps are used to study how modern GLOFs are recorded in fjords sediments, in combination with river and fjord monitoring data. The project combines the expertise of scientists active in sedimentology, glaciology, hydrology, oceanography, geochemistry, paleoclimatology, and environmental history. Ultimately, our results will be used to assess the possible relationships between GLOF frequency and climate variability. 

PI: Sebastien Bertrand

PhD student (2016-2021): Elke Vandekerkhove

 

Scientific publications

Vandekerkove et al. (2020). Modern sedimentary processes at the heads of Martínez Channel and Steffen Fjord, Chilean Patagonia. Marine Geology, 106076.

Vandekerkove et al. (2020). Neoglacial increase in high-magnitude glacial lake outburst flood frequency, upper Baker River, Chilean Patagonia (47°S). Quaternary Science Reviews, 106572.

Vandekerkhove et al (forthcoming). Signature of modern Glacial Lake Outburst Floods in fjord sediments (Baker River, Chile). Sedimentology

Blog posts

2016

Finding my way through the Chilean slang jungle

Following Rio Baker from Lago Bertrand to pirate cove

Austral winter lawn-mowing

Assembling our lawn-mower

Here comes the sun

Wishing Tortel farewell

2017

Fourty meters of mud and counting…

Better than manjar!

2018

Los dos Reyes

Los dos Geolocos meet another Rey

A year of mud

“This is Patagonia”

2019

Back in Patagonia: land of glaciers, rivers and research

Holy muddy waters of Patagonia

Logging, trapping, releasing and recovering…

2020

Chasing Patagonian sediment

Plan B

News articles

2016

El Diario de Aysen

El Mercurio

El Diario de Aysen

Patagon Journal

2019

La Tercera

El Divisadero

Canal Sur Patagonia

El Divisadero

2020

Las Últimas Noticias

Glacierhub

El Divisadero

Canal Sur Patagonia

Las Últimas Noticias

Instagramhttps://www.instagram.com/rcmg_on_the_field/?hl=en 

 

Funding

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