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Hydrometeorological thresholds for landslide initiation and forest operation shutdowns on the north coast of British Columbia

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Abstract

Debris flows and debris avalanches are the most widespread and hazardous types of landslides on the British Columbia north coast. Triggered by heavy rain, they pose risks to forestry workers in sparsely developed regions. The scarcity of long-term quality rain gauges and the lack of weather radar information create significant challenge in predicting the timing of landslides, which could be used to warn and, when necessary, evacuate forestry personnel. Traditional methods to relate rainfall antecedents and rainfall intensity to known landslide dates have proven to be unsatisfactory in this study due to extreme spatial variability of rainfall, enhanced by the orographic effect and the scarcity of rain gauges in a very large area. This has led to an integration of meteorological variables in a landslide advisory system that classifies three types of approaching storms by the 850-mbar wind speed and direction, the occurrence of subtropical moisture flow, and the existence of a warm layer characterized by high thickness values of the 500- to 1,000-mbar pressure levels. The storm classification was combined with a 4-week antecedent rainfall and the 24-h rainfall measured near or in the watershed where logging operations are taking place. This system, once implemented, is thought to reduce loss of life, injury, and economic losses associated with forestry works in the study area.

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Acknowledgements

This research was sponsored by FIA Forest Science Program of British Columbia Ministry of Forests (Project Y051047) with additional support funding from BGC Engineering Vancouver and the BC Ministry of Forest, Northern Interior Forest Region. We thank Ernst Jakob for assistance in the field and Hamish Weatherly for the review of an earlier draft of this paper.

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Authors and Affiliations

  1. BGC Engineering Incorporated, 500-1045 Howe Street, Vancouver, British Columbia, V6Z 2A9, Canada

    Matthias Jakob & Kris Holm

  2. Environment Canada, 200, 401 Burrard Street, Vancouver, British Columbia, V6C 3S5, Canada

    Owen Lange

  3. BC Ministry of Forests, 3333 Tatlow Road, Smithers, British Columbia, V0J 2N0, Canada

    James W. Schwab

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  1. Matthias Jakob
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  2. Kris Holm
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  3. Owen Lange
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  4. James W. Schwab
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Correspondence to Matthias Jakob.

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Jakob, M., Holm, K., Lange, O. et al. Hydrometeorological thresholds for landslide initiation and forest operation shutdowns on the north coast of British Columbia. Landslides 3, 228–238 (2006). https://doi.org/10.1007/s10346-006-0044-1

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  • DOI: https://doi.org/10.1007/s10346-006-0044-1

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