Water Stewardship Information Sources

Citation Blais-Stevens, A and Kung, RB. 2009. Landslide susceptibility maps of the Sea to Sky Corridor, British Columbia - a qualitative approach. Geological Survey of Canada. Open File 6169. Poster.
Organization NRCAN
URL http://open.canada.ca/data/en/dataset/28732f11-d436-5e70-a8ff-3a723dd12afa
Abstract/Description or Keywords Historically, the Sea to Sky Corridor has witnessed 155 reported landslide events in the last 154 years. As part of the Public Safety Geoscience Program at the Geological Survey of Canada, a preliminary landslide susceptibility mapping activity was undertaken. The resulting maps are presented as work-in-progress. The method used was a qualitative parametric approach based on the available landslide inventory and baseline information (Journeay and Monger, 1998; Riopel et al., 2006; Blais-Stevens, 2007; 2008abc; Blais-Stevens and Septer, 2008; Couture and Riopel, 2008). We divided the landslide susceptibility thematic mapping activity into producing two separate maps based on the more frequent types of landslides in the area and the fact that the parameters causing these types of landslides are very different from one another. One landslide susceptibility map was created for rock falls/rock slides and the other, for debris flows. In each map, a series of information layers (Fig. 1) was compiled from available documentation and/or derived from DEMs (Riopel et al., 2006; Couture and Riopel, 2008). From this information, a parametric equation was defined where the information layers served as parameters with each parameter being given a weight. The units within each layer of information were also given a rating (See examples of rating in Tables 1 and 2). The resulting equation gave a Susceptibility Index (SI) ranging between 0-1 for each (25 m x 25 m) pixel. For the final products, SI units were divided into four colour-coded categories, from Low (green), Medium-Low (yellow), Medium-High (orange), and High (red).
Information Type poster
Regional Watershed Howe Sound & Sunshine Coast
Sub-watershed if known
Aquifer #
Comments
Project status complete
Contact Name Andree Blais-Stevens
Contact Email [email protected]