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Future changes in precipitation-caused landslide frequency in British Columbia

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Abstract

Landslide hazards in British Columbia are mainly caused by precipitation and can result in significant damage and fatalities. Anthropogenic climate change is expected to increase precipitation frequency and intensity in the winter, spring, and fall in British Columbia (BC), potentially resulting in increased frequency of landslide hazard. Quantifying the effect of changing precipitation on future landslide hazard across the varying topographic and climatic conditions in BC requires detailed projections of future precipitation. Here, the operational Landslide Hazard Assessment for Situational Awareness (LHASA) model is used with high-resolution, statistically downscaled daily precipitation to generate detailed simulations of landslide hazard in BC over the twenty-first century. Historical evaluation of the LHASA model is performed using a station-based, gridded observational precipitation dataset. Classification of observed landslide dates and locations as hazard events occurs as successfully as, or slightly better than, when LHASA is applied globally with satellite precipitation. Using the LHASA model with precipitation projections from 12 downscaled global climate models following RCP8.5 indicates that future landslide hazard frequency will increase from 16 days per year to 21 days per year (32%) on average by the 2050s for landslide susceptible regions in the province. Areas of the province currently with the most frequent landslide hazards (18 to 21 days per year), including the west coast and northern Rocky Mountains, are expected to see between 8 and 11 additional hazardous days (49 to 61% increases) per year. Most of the increased hazard frequency occurs during winter and fall, reflecting those seasons with the largest projected increases in single and multi-day precipitation. Risk assessments for regions in British Columbia vulnerable to landslides will need to account for increasing hazard due to climate change altered precipitation.

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Acknowledgements

Code for the LHASA model was provided by D. Kirschbaum and T. Stanley. F. Zwiers and T. Murdock and three anonymous reviewers provided helpful comments on versions of the manuscript.

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  1. Pacific Climate Impacts Consortium, University of Victoria, PO Box 1700 Stn CSC, Victoria, BC, V8W 2Y2, Canada

    Stephen R. Sobie

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Sobie, S.R. Future changes in precipitation-caused landslide frequency in British Columbia. Climatic Change 162, 465–484 (2020). https://doi.org/10.1007/s10584-020-02788-1

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