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Brent Ward Profile picture
@GeoBrentatlarge
Aug 20, 2020 • 3 tweets • 2 min read • Read on X
Pictures of the debris flows that affected the Alaska Highway near Ä'äy Chù (Slim's River), Yukon on Monday. MSc student Crey Ackerson and NSERC USRA Kenya Franz provided helicopter pictures. Slide 1 was the largest, significant debris on the highway. Location map next 1/3 ImageImageImage
Initiation zones for both slides are at the break in slope between the plateau and the steep headwaters. Both areas of initiation zones seem to indicate shallow, permafrost related failures. Some intense rain occurred Sun/Mon. Map from Panya Lipovsky #YukonGeologicalSurvey 2/3 Image
Slide 2 did not affect the highway as much. Both drainages have failed and impacted the highway in the past. Crey and Kenya are out today to get more pictures. So possibly more pictures and hopefully more intelligent comments tomorrow. 3/3 ImageImage

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More from @GeoBrentatlarge

Brent Ward Profile picture
Sep 15, 2020
On August 29 examined some active layer detachment slides Near Arch and Quill creeks, SW Yukon. Around 25-30 slides occured on August 17, the same time the Alaska Highway was blocked by debris flows. A thread of these. This is the slides near where we landed. 1/10 Image
Landed on the deposition zone of one of the landslides and flew the drone. Helicopter indicated for scale. 2/10 ImageImageImage
This is part of Crey Ackerson’s MSc thesis supported by Kristy Kennedy from the Yukon Geological Survey. 3/10 Image
Read 10 tweets
Brent Ward Profile picture
Sep 4, 2020
Finally some pictures of the Koidern Landslide. Start with some aerial pictures and then some more details. Some really interesting mollards, and some have remobilized! It is a long thread as it was a really cool landslide! 1/10
Looks like several phases. Initial failure crossed the small valley and then turned the corner. Then remobilization with a more fluid flow down the valley, blocking the larger stream. Then a smaller failure from the headscarp, where we first landed the helicopter. 2/10
Margin of the slide with lots of mollards. Nice streaking of the bedrock. 3/10
Read 10 tweets
Brent Ward Profile picture
Aug 12, 2020
Helicopter work, Covid style!

Great day in Crey Ackerson's field area with Kristy Kennedy Yukon Geological Survey. 1/ ImageImage
Love Helicopters! 2/
Spent the day in and around the Duke River area of Kluane National Park /3 Image
Read 7 tweets
Brent Ward Profile picture
May 16, 2020
It is my birthday eve and evil daughter #2 cooked me an awesome dinner and bought me a beautiful bottle of scotch! Maybe she is not so evil after all? ImageImageImage
Getting excited about the cake! The icing will be amazing!
The cake! Icing is a little thin but it tastes awesome! ImageImage
Read 4 tweets
Brent Ward Profile picture
Feb 19, 2020
Spent a beautiful Friday at Point Grey (aka Wreck Beach) looking at the stratigraphy. He we have two advance sub-units below the till. The lower is interstratified sand and silt with peats, with ages from 26-24 ka, the upper, cross stratified sand. 1/ Image
These advance sediments are called Quadra Sands and some diatoms in the lower sub-unit sediments indicate marine incursion. The upper sands show tidal influence. With eustatic sea level at this time, indicates >100 m of isostatic depression! 2/ Image
The accumulation of ~70 m of Quadra sands indicates significant accommodation space. The two sub-units are exposed all along the escarpment. 3/ Image
Read 8 tweets
Brent Ward Profile picture
Feb 11, 2020
Friday’s Seymour valley fieldtrip examined the stratigraphy of the thick valley fill. The base is 42-29 ka MIS 3 gravel, sand and peat, indicating warmest climate at the base and progressively cooler to the top. 1/9 Image
The MIS 2 Fraser Glaciation, has two advance stades. These are advance glaciolacustrine sediments of the older Coquitlam Stade, a mix of laminated to finely bedded silt and sand and diamicton. 2/9 Image
Indicates ice blocked the mouth of the Seymour valley, forming this lake. There is wood in these advance sediments, dating to around 21 ka. Implies there is a spruce-fir forest in the area as ice advanced. 3/9 ImageImage
Read 10 tweets

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