Citation | Thompson, B. 1998. Terrain attribute study: slope failure frequencies following logging in coastal British Columbia. In: Hogan, D.L., P.J. Tschaplinski, and S. Chatwin (Editors). B.C. Min. For., Res. Br., Victoria, B.C. Land Manage. Handb. No. 41. |
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Organization | FLNRO |
URL | https://www.for.gov.bc.ca/hfd/pubs/docs/Lmh/Lmh41.htm |
Abstract/Description or Keywords | The identification of terrain that will be subject to slope failures following logging or road building is a high priority for forest management in coastal British Columbia. This information can be used at the planning level to ensure that annual allowable cuts (AAC) calculations reflect the land base truly available for harvest, and at the development stage to ensure that environmentally sensitive areas are not damaged. There is a need for a more objective and quantitative approach for the prediction of post-logging slope stability. This approach requires the collection of data on the frequency of slope failures following logging, so that the reliability of the criteria used by mappers for slope stability assessments can be improved. An empirical approach, applied to a representative sample of landscape units over a wide geographical area, has potential for quantifying the likelihood of landslide occurrence. The objectives of the study are two-fold: 1. to characterize steepland terrain types that are subject to slope failures following conventional clearcutting and road building, and those which are not; and 2. to develop a multi-factor terrain-based stability classification system that addresses the likelihood and frequency of slope failures occurring following conventional clearcutting and road building. The study area involves a number of large contiguous land units within the western portion of the Insular Mountains of Vancouver Island, and the Cascade Mountains and southern Coast Mountains on the British Columbia mainland. The study is ongoing; data acquisition is completed for the Vancouver Island portion, and data acquisition for the Cascade and Coast mountains will begin this field season. Methodology, including data collection and analysis, were presented. An example of results of analysis of a limited set of data was also presented. |
Information Type | abstract |
Regional Watershed | Coast Region |
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Project status | complete |
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