| Issue |
E3S Web of Conf.
Volume 415, 2023
8th International Conference on Debris Flow Hazard Mitigation (DFHM8)
|
|
|---|---|---|
| Article Number | 05026 | |
| Number of page(s) | 4 | |
| Section | Case Studies and Hazard Assessments | |
| DOI | https://doi.org/10.1051/e3sconf/202341505026 | |
| Published online | 18 August 2023 | |
Quantifying debris-flow hazard and risk based on fan sector
1 BGC Engineering Inc., Golden, Colorado, USA
2 The University of British Columbia, Vancouver, British Columbia, Canada
3 BGC Engineering Inc., Vancouver, British Columbia, Canada
* Corresponding author: astrouth@bgcengineering.ca
We show how a quantitative estimate of debris-flow hazard and risk can be derived simply from the position of infrastructure on the fan relative to the fan apex and the most likely flow path (e.g., active channel). Fan sectors and the spatial probability of impact in each sector are based on a fan-normalized heat map of debris-flow impacts derived from 146 mapped impact areas across 30 fans in southwestern British Columbia, Canada. As a proof-of-concept, we provide an example for annual life loss risk to an individual who occupies a home in various sectors of a debris-flow fan. The results are comparable to broad findings from quantitative risk assessments completed at 10 fans in British Columbia and Alberta, Canada with similar characteristics. The method presented here is a way to obtain a high-level quantitative risk estimate prior to a detailed site-specific assessment.
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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