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Gentle slopes of fans belie the presence of hydrogeomorphic hazards for forestry activities: inundation, scour and sediment deposition from floods, debris floods and debris flows. Begun in 2000, this study described impacts due to conventional forest management practices on fans in the Prince Rupert Forest Region (PRFR). Hydrogeomorphic processes were aggravated on 41 of the 55 study fans, leading to destabilization of fan surfaces and stream channels, and impacts to roads, drainage structures and plantations. A suite of hazard indicators was developed based on 65 study fans and their watersheds: models for predicting hydrogeomorphic process, power, disturbance extent, and frequency; aerial photograph features; and site features. The hazard scheme was tested on 51 randomly selected fans in the study area and 15 fans across the province. The scheme proved to be effective in identifying hazards for forestry activities. Extension included field workshops (in the PRFR and other locations in BC), conference presentations, and publications.
D.J. Wilford, M.E. Sakals, W.A. Bergerud and J.L. Innes.
Wilford, David J., Sakals, Matt E.; Innes, John L.; Sidle, Roy C.; Bergerud, Wendy A.. 2004. Final technical report: forest management on alluvial and colluvial fans. Forest Investment Account (FIA) - Forest Science Program. Forest Investment Account Report
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