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In July 2005, a debris flow and a water flood occurred on two adjacent gullies in the White River area, on northern Vancouver
Island in British Columbia, Canada. The 16,000 m3 debris flow buried approximately 7.5 ha of second-growth trees, buried approximately 500 m of a forestry road, and reached
two fish-bearing streams. The water flood eroded approximately 240 m of the same forestry road and plugged four culverts before
overtopping and inundating the road. To better plan for future events, risk analyses of debris flows, debris floods, and water
floods were carried out for the two gullies involved, plus a third adjacent gully. The elements at risk that were analyzed
included, in order of priority: users of the forestry road, the fish-bearing streams, the forestry road itself, and a timber
bridge. Using a series of qualitative, but defined, relative-risk matrices, the following components of specific risk were
estimated for each of the three types of events on each of the three gullies for each of the four elements at risk: probability
of occurrence, probability that the event will reach or otherwise affect the site of the element at risk, the probability
that the element at risk will be at the site when the event occurs, and the probability of loss or damage resulting from the
element being at the site when the event occurs. 相似文献
2.
Kuskonook Creek, an example of a debris flow analysis 总被引:1,自引:0,他引:1
Two debris flows occurred on Kuskonook Creek in British Columbia, Canada, in August and September 2004. The initiation factors
included a major forest fire in the catchment in 2003, in association with relatively small rainfall events and the accumulation
of sediment in the creek channels since the last large debris flow event. Previous regional studies and morphometric comparisons
with other similar catchments indicate that Kuskonook Creek has characteristics predisposed to debris flows, even without
the affects of a forest fire. Based on the investigations and analyses, a magnitude/frequency relationship for future debris
events on Kuskonook Creek was developed, and this information was used to carry out a partial risk assessment. It is suggested
that for design purposes, a 1/50-year return period and the corresponding debris flow magnitude of 15,000 m3 would provide conservative protection to the users of the provincial highway at the mouth of the creek. 相似文献
3.
Debris flows were first recognized in Canada in the 1940s, however, most studies of the topic have been carried out since the early 1980s. An integral part of this paper is the Bibliography of Canadian Subaerial Channelized Debris Flows that contains 295 citations which are also categorized into various subjects and geographical areas. The bibliography is available on the ``World-Wide Web'. Based on a review of past and current research, eleven priority topics for future debris flow research in Canada are outlined. 相似文献
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