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Thread: Data normalized for slope use
05-28-2012, 10:37 PM #1
Data normalized for slope use
Are there any recent data that separately shows frequency of skier/boarder accidental triggering by...
...where that data has been normalized for slope use in each instance?
05-29-2012, 01:54 AM #2
05-29-2012, 03:13 AM #3
Thanks CookieMonster for the link. That looks like some reading.
At your prompt, looking now at my copy of The Avalanche Handbook, 3rd edition, page 224, figure 8.6. There is a chart that uses normalized data for likelihood of triggering by aspect, and references the paper you linked to. I think that is what I am after.
Regarding slope steepness and normalized data I found this at Wikipedia:
But when the incidence of human triggered avalanches are normalized by the rates of recreational use hazard increases uniformly with slope angle, and no significant difference in hazard for a given exposure direction can be found.
I am slowly scanning his papers for the relevant research.
05-29-2012, 01:44 PM #4
Happy to help! The link at avisualanche contains lots of good material, although I can't remember which of his work contains the info you need. Try his thesis?
Sent from my Paranoid Android using TGR forums.
05-29-2012, 04:58 PM #5
Lucky that CMH built that valuable database over the years. Unrealistic and hypothetical: it would be nice to investigate trigger probability by slope aspect where the only difference between aspects was solar radiation. No ski-quality slope-use bias, no wind loading bias etc. I don't know why I am thinking about this, just as a trivial summer hobby I guess - prompted possibly by recent exhortations that "the north sector is more dangerous because that is where most avalanches happen" during a rather casual presentation I saw on contemporary European reduction methods ["Munter (2003) recognises that the lack of usage data is a serious problem for his risk analysis" - I wish I had known that during the presentation!] I do not personally need the data to satisfy myself as my experience and intuition tells me the answer - and the answer changes with time-since-storm and time-of-day and time-of-season. I am glad that the CAC Slope Evaluation Card left slope aspect off the Terrain Character checklist.
05-30-2012, 12:55 AM #6
http://www.avisualanche.ca/downloads...EbookColor.pdf ( It's a big read, but worth it if you're feeling patient. )
Laura Adams' MSc thesis is astoundingly brilliant - if you haven't read it. I'd go as far as saying that -overall- it's the best thing I've ever read on the subject, and I learned a lot from the references too.