The use of digital elevation models as a preliminary slope stability tool for the Clayoquot River Watershed

• Main Author: Faucette, Dave
• Language: English
• Published: 2009
• Online Access: http://hdl.handle.net/2429/4430

The purpose of this thesis was to develop a preliminary slope stability tool for the Clayoquot River Watershed. Current techniques obtained from aerial photographs, topographic maps and field surveys are becoming increasing expensive to undertake. Testing new, cost effective, easily acquired methods for mapping hazardous areas needs to be undertaken. This project attempts to do this by using morphological variables acquired from Digital Elevation Models (DEMs) and Geographic Information Systems (GISs). In contrast to current hazard mapping methods used in British Columbia the procedure outlined in this project attempts to provide an indication of the fluxes taking place within the landscape. The Clayoquot River watershed situated along the west coast of Vancouver Island was the study site for this research project. Steep slopes, a harsh climate and the intense debate over logging throughout the entire Clayoquot Sound region makes this an ideal location to test a method as proposed in this thesis. Slope gradient, transient snow zone, across slope curvature and catchment area were the four variables that went into creating a slope stability image. The next stage was to combine this image with a rating based on surficial geology and then to test this product with the hazard maps produced by MacMillan Bloedel for the area. Unfortunately their project has been delayed, so testing the findings of this thesis is not possible at this time. With improved models for acquiring the variables and more accurate digital information along with the procedures outlined in this thesis, it is felt that preliminary slope stability assessments will become an invaluable tool to the forest managers throughout British Columbia.