| Title | Characterization of landslides used in landslide susceptibility models in western Canada |
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| Author | Blais-Stevens, A ;
Behnia, P |
| Source | GAC-MAC 2017, abstracts/GAC-MAC 2017, résumés; Geological Association of Canada-Mineralogical Association of Canada, Joint Annual Meeting, Abstracts Volume vol. 40, 2017 p. 30  Open Access |
| Links | Online - En ligne (complete volume, PDF, 3.09
MB)
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| Image |  |
| Year | 2017 |
| Alt Series | Earth Sciences Sector, Contribution Series 20160417 |
| Publisher | Geological Association of Canada |
| Meeting | GAC-MAC 2017: Geological Association of Canada-Mineralogical Association of Canada Annual Meeting; Kingston, ON; CA; May 14-18, 2017 |
| Document | serial |
| Lang. | English |
| Media | on-line; digital |
| File format | pdf (Adobe® Reader®) |
| Program | Public Safety
Geoscience Marine Geohazards |
| Released | 2017 05 01 |
| Abstract | As a first step in assessing landslide hazard, compilation of the landslide inventory is essential. The second step is creating a landslide susceptibility model, which will highlight areas prone to
landslide occurrence. The landslide inventory and susceptibility maps will then serve as baseline information to help stakeholders, decision-makers, and practitioners assess the hazard and risk. As part of Natural Resources Canada, the Geological
Survey of Canada's Public Safety Geoscience Program has carried out four campaigns of landslide inventory and susceptibility mapping in western Canada, which are at different stages of completion. These campaigns were carried out for the Sea to Sky
Highway, BC (110 km) and along the Alaska Highway, Yukon (900 km) and are ongoing along Douglas Channel (100 km) and east of Kitimat, BC (100 km) with collaboration from provincial, territorial, academic partners, and consultants.
The simplest
landslide susceptibility modelling approach for a large area is the qualitative heuristic method. This approach was first tested along the Sea to Sky corridor for debris flows and rockfalls/rock slides. The historic record of debris flows and
rockfalls/rock slides proved to be essential in validation of susceptibility models because debris flows recur in the same steep channels and rockfalls get cleaned up quickly. For the Yukon Alaska Highway corridor, qualitative heuristic assessments
were tested for debris flows, rock slides and active layer detachment slides (ALD). Validation of the ALD susceptibility model proved to be difficult as ALD are small, localized, and have a short lifespan (~30 years). In an area close to Kluane Lake,
a quantitative debris flows susceptibility model was tested using Flow-R software. This proved to be successful as the debris flow inventory was well documented and data derived from a high resolution DEM were available.
Two areas presently being
assessed are Douglas Channel fjord southwest of Kitimat and the Kitimat-Morice River corridor. For Douglas Channel, the landslide inventory reveals that folic debris slides are the most abundant types of landslides. Folic debris slide susceptibility
modelling, however, is proving somewhat difficult as these are small and triggered during rainy periods as a thin layer of organic debris on steep glacially polished bedrock. The model still needs adjustments. Nevertheless, the Flow-R method was
investigated for debris flow susceptibility where LiDAR data were available.
Thus, each region possesses unique landslide events affecting the landscape. Understanding the characteristics of landslides help determine the types of data layers
needed in the susceptibility models. |
| Summary | (Plain Language Summary, not published)
This is an abstract for the GAC 2017 conference. It is submitted in the Geohazards and engineering session. It highlights characterization of landslides
used in landslide susceptibility models for four regions in western Canada. These are the Sea to Sky highway, Yukon Alaska Highway, Douglas Channel fjord, and a corridor east of Kitimat to Morice River, BC |
| GEOSCAN ID | 299849 |
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