4.6 Article

Projected effects of climate change on shallow landslides, North Shore Mountains, Vancouver, Canada

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GEOMORPHOLOGY
卷 393, 期 -, 页码 -

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ELSEVIER
DOI: 10.1016/j.geomorph.2021.107921

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Shallow landslides; Debris avalanches; Debris flows; Frequency-magnitude relationships; Climate change

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Research in southwest British Columbia suggests that climate change will lead to increased frequency and volume of shallow landslides and debris flows. The increase in landslide frequency since 1981 has doubled, with an average volume increase of 7-fold. Models project a potential 300% increase in landslide frequency and a 50% increase in average landslide volume by the end of the century.
Previous research in southwest British Columbia (BC) suggested that projected climate change would result in in increases in the frequency of debris flows on the order of a 10% by the end of the century compared to the last approximately 30 years (Jakob and Lambert, 2009). Advances in climate modeling now allow higher resolution simulation of precipitation compared to the work completed in 2009. Regional climate models have become better able to resolve convective activity at a finer temporal scale. This paper quantifies and projects changes in the frequency and magnitude of shallow landslides and resulting debris flows because of the impacts of climate change for the North Shore Mountains of Vancouver, BC. Analysis of a landslide database curated by Metro Vancouver shows a doubling in the frequency of landslides since 1981, prior to which recording was sporadic. How much of the increase since 1981 is attributable to recording improvements cannot be quantified which implies that it is too early to attribute frequency changes unambiguously to climate change. Prior to 2004, the average volume of shallow landslides was 1800 m(3), whereas after 2004, this volume increased 7-fold to 13,000 m(3). In particular, landslides with volumes exceeding 10,000 m(3) appear to have increased abruptly since in the early 2000s. Using a Poisson model, we project an increase of up to 300% in the frequency of shallow landslides until the end of this century. A multivariate regression analysis suggests that this increase in landslide frequency will be accompanied by a potential increase in the average landslide volume of up to 50% for Relative Concentration Path (RCP) 8.5. Such changes may challenge watershed management attributable to increases in sediment transport rates, widening channels and in some cases may transition from single thread to braiding or anastomosing. The likelihood of landslides impacting and impounding water courses is projected to increase as is the turbidity in reservoirs because of the influx of fine-grained sediment. Outside of the Vancouver watersheds, infrastructures will increasingly be tested by more frequent and sometimes higher magnitude landslides. (C) 2021 Elsevier B.V. All rights reserved.

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