Water Stewardship Information Sources

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.
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
Sub-watershed if known
Aquifer #
Comments
Project status complete
Contact Name
Contact Email