Mass wassting on Knight Inlet - ClubTread Community

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post #1 of (permalink) Old 09-15-2007, 04:57 PM Thread Starter
 
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Default Mass wassting on Knight Inlet

I was working up in the Knight inlet area around 1999.

Mt Kennedy above Glacier Bay.....the North face let loose above a big clearcut and forest........ similar size as hope slide.

Happened in July I believe...for weeks after tonnes of logs were salvaged in area.

this area is about 10 or so kms down from the head of Knight Inlet.

anybody know any thing about this?? the bottom of the slide was about a km or so wide?
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post #2 of (permalink) Old 09-17-2007, 11:18 AM
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yes
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post #3 of (permalink) Old 09-17-2007, 05:07 PM
dwd
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are you talking the big slide that happened about 10 years back you can easily see with google earth? or is there something new out there?
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post #4 of (permalink) Old 09-17-2007, 05:16 PM
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I wandered around that slide last summer (2006). But it was not recent. 10 years ago sounds about right. It also seems to have come off Three Finger Peak, not Mt. Kennedy, but maybe you are talking about a more recent slide.
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post #5 of (permalink) Old 09-17-2007, 09:00 PM
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nope that's the right one. alpenglopro just has his details wrong. it made a little wave in the inlet too!
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post #6 of (permalink) Old 02-10-2008, 11:09 PM Thread Starter
 
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Knight Inlet Mass wasting

Hey there Dru.....I don't have a topo in front of me so I can not tell you the exact peak names or pinpoint by GPS. Not that it is important but I do know it was in the bowl roughly south above glacier bay in Knight Inlet and below a huge north face. And I could take you there tomorrow. I have spent many many hours on the bay itself venturing up from Glendale Cove in all sorts of weather.

I wonder if you could tell me all you know (since you probably know more than me since as you seem to work in geotech field or something similar and seem to know a little than the typical lay person about the area)about this slide if you do in fact know and set any of the facts straight.

I have done some online research but have not found any thing and I am curious...

How big was the slide? Width

How far did it run

Kinetic energy heat that it produced.

How much timber was removed by the slide and the salvators

How big a wave was produced.

Was there any seismic activity associated with it.

Was there a seismic read out as a result of the energy caused by the slide?

I could see no scouring of any wave action on the adjacent fiord walls.

I was there just before it happened and just after within a 3 or 4 day period.

I was quite suprised when I turned the corner and saw the initial devastation.

Perhaps you know? I'd be very interested in finding out.

And incidently there are some huge huge cliffs down the inlet toward glendale on the opposite shore that look like they could offer some rewarding routes we always referred to them as the cathedral spires but I don't think they are named on the map it might be a local name...

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post #7 of (permalink) Old 02-11-2008, 07:27 PM
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It's about 1km wide (+/-); Hope Slide is much larger.
Came off the west face of Three Finger in 99

No seismic trigger; no major landslides since Col. Foster '46 in BC have been.

Wave height was quite low likely due to the lip rollover reducing momentum before it entered the fjord. I believe only the opposite wall of the inlet was washed to a height not exceededing 4? m. Tide may have been out too?

Incidentally about 400 yrs ago a Native village on Knight inlet was completely destroyed by a landslide-induced tsunami, killing c. 200 people - largest tsunami death toll confirmed in Canadian history

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post #8 of (permalink) Old 02-11-2008, 07:54 PM
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quote:Originally posted by Dru



Nice shot, Dru. This area holds special interest as I was part of a crew who surveyed around the inlets; Butte to Seymour, back in 1977 for the Ministry of Forests.

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post #9 of (permalink) Old 02-11-2008, 07:59 PM
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Some more recent pics:

More covered in vegetation now:
http://www.physics.ubc.ca/~veenstcn/...on2006_074.jpg

Looking back down:
http://www.physics.ubc.ca/~veenstcn/...on2006_086.jpg
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post #10 of (permalink) Old 02-11-2008, 09:10 PM
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Interesting that this came up. I flew over it a few years back on my way into KI camp and have been wondering about it. No one in camp seemed to know anything about it.
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post #11 of (permalink) Old 02-11-2008, 09:15 PM
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A guy at SFU is writing his Masters on it right now.
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post #12 of (permalink) Old 02-11-2008, 10:02 PM Thread Starter
 
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Very nice I had always wondered about that. thanks much

lots of debris as a result for the rest of that summer. Salvators made a killing logs I suspect saw several boom as a result.

be interesting to see if that slide registered on the seismic scale.

all interesting photos. I have some before and after shots from bay level in the files somewhere.

That Indian village( the one that got nuked) was at the mouth of the Kwalate River think that is the right spelling don't have a map near by

also interesting to note the 2nd shot of glacier bay from up on the slide shows the mouth of the Ahnuhati river I once saw a wolf chase a deer into the water there forcing the deer to swim the small bay the wolf tried to outflank the deer along the shore but couldn't or was unwilling to cross the raging canyon of the Ahnuhati. the deer collapsed on the granite slabs on the west side of the mouth of the Ahnuhati.

Real interesting remote terrain.


If you get a chance scout those spires out further west down the inlet...lots of aid potential overhangs etc and not that bushy.
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post #13 of (permalink) Old 10-12-2016, 08:17 PM
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It turns out still nobody knows how big the 1999 wave was. But the slide volume has been constrained somewhat: 0.2 to 2 million cubic meters. See van Zeyl et al (2015) http://www.nat-hazards-earth-syst-sc...-1425-2015.pdf
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post #14 of (permalink) Old 10-12-2016, 11:03 PM
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Is wassting a geotechnical term? Just asking, don't know what it means.
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post #15 of (permalink) Old 10-13-2016, 01:04 AM
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Mass wasting is a fancy geotech term for landslide, wassting would be a typo.
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