Citation | Fannin, RJ, Wise, MP and Rollerson, TP. 1998. Landslide runout behaviour in the Queen Charlotte Islands. 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 | Field observations of 449 debris flows on the Skidegate Plateau of the Queen Charlotte Islands are summarized. Movement of debris is classified according to seven characteristic types and an analysis of the data, using morphological criteria, is made with reference to event yield and deposition. The classification is based on event location (open slope or channelized), gradient of the path of movement, and whether two or more event paths join together. The data are used in an analysis of event initiation on open slopes, transportation and deposition of debris, and debris yield rates along the path of movement. A key distinction is made between events on open slopes and those which initiate or travel within a gully. With regard to runout behaviour, the total travel distance and volume of deposited material are found to vary with event type. Deposition of channelized events is found to be influenced by the ratio of channel width to channel gradient. Five classes of depositional area are proposed, based on the field observations. The use of the data for development of a simple model to predict debris flow travel distance is illustrated. |
Information Type | abstract |
Regional Watershed | Coast Region |
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Project status | complete |
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