Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 49, Issue 6, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL096716
Keywords
landslide; hazard cascade; deglaciation; glacial lake; tsunami; outburst flood
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Funding
- Tula Foundation
- Natural Sciences and Engineering Research Council of Canada
- Canada Research Chairs Program
- Province of British Columbia
- NASA Earth Surface and Interior Grant Program [80NSSC20K0491]
- Province of BC
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This article describes and models the recent landslide, tsunami, outburst flood, and sediment plume in the southern Coast Mountains of British Columbia, Canada. The use of physically based models allows for real-time simulations, improving understanding of similar hazard cascades and the associated risks.
We describe and model the evolution of a recent landslide, tsunami, outburst flood, and sediment plume in the southern Coast Mountains, British Columbia, Canada. On November 28, 2020, about 18 million m(3) of rock descended 1,000 m from a steep valley wall and traveled across the toe of a glacier before entering a 0.6 km(2) glacier lake and producing >100-m high run-up. Water overtopped the lake outlet and scoured a 10-km long channel before depositing debris on a 2-km(2) fan below the lake outlet. Floodwater, organic debris, and fine sediment entered a fjord where it produced a 60+km long sediment plume and altered turbidity, water temperature, and water chemistry for weeks. The outburst flood destroyed forest and salmon spawning habitat. Physically based models of the landslide, tsunami, and flood provide real-time simulations of the event and can improve understanding of similar hazard cascades and the risk they pose.
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