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ID 589
Citation Eichel, A and Fuller, T. 2002. Landslide susceptibility from watershed and fan characteristics, Salmn Arm and Vernon Forest Districts. Technical Report 003. BC Ministry of Forests and Range.
Organization FLNRO
URL http://www.for.gov.bc.ca/hfd/pubs/Docs/Tr/Tr003/EichelFuller_LandslideSusce.pdf
Abstract/Description or Keywords Landslide occurrence in the Salmon Arm and Vernon forest districts in the last five years has
stimulated research to determine how small drainage basins might be classified into debris flow
prone, debris flood prone, or flood prone. Alluvial fans situated at the base of several entrenched
stream systems may have people dwelling on them. In addition to safety concerns, water quality
and habitat are also of importance. A procedure is presented here that uses both map-based (GIS)
and field-based (fan and channel mapping) analysis to show relative risk of impact on fans.
Bedrock and surficial geology are used to type the basins that are dominated by metamorphic
rocks. Basin area, aspect, slope, inner gorge, and gentle-over-steep conditions were determined.
GIS-generated channel longitudinal profiles were compared between the data sets. Fan
morphology and stratigraphy aided in identifying previous debris flow events and their
magnitude. Historical information provided by time-series air photo interpretation, historic maps,
and archival research provides clues to recurrence intervals. Some fans will have relict
paraglacial deposits that include debris flows and may still support future debris flows. Last, the
methods proposed here can be used to signal special concerns for forest development. The use of
this template may find application in risk assessment outside the selected forest districts.
Information Type article
Regional Watershed Shuswap, Okanagan
Sub-watershed if known
Aquifer #
Comments
Project status complete
Contact Name Ted Fuller
Contact Email [email protected]