q*c
发帖数: 17993 | 1 http://www.treewelldeepsnowsafety.com/
What exactly is a tree well?
Trees are an important and integral part of the natural mountain environment
. Thick stands of evergreen trees are common at ski resorts in the western U
.S. and Canada, predominantly in the ungroomed areas.
Most of the documented cases of deep snow suffocation at ski areas involve
people falling headfirst into a tree well.
A tree well is the hole or depression that forms around the base of a tree.
Evergreen trees (fir, hemlock, etc) can have large, deep tree wells that
form when low hanging branches prohibit snow from filling in and
consolidating around the base of the tree. These holes are hidden from view
by the tree's low hanging branches.
One step into the tree well and the person here is 6 feet tall.
IMPORTANT TREE WELL FACTS
Hazardous tree wells are generally found in ungroomed areas. You must also
be careful next to trees on the edges of groomed trails.
Particularly hazardous trees are fir trees that have their lower branches
touching the snow surface. The branches help form a canopy over the tree
well and can support a lot of snow on top of them. This snow is often
knocked off if a person falls through the branches into the tree well and
results in a deeper burial in the tree well.
There is no easy way to identify if a particular tree has a dangerous tree
well by sight. The branches often block visibility of the hole that may
exist. Even very small trees can have deep tree wells and have resulted in
burials. Many of the NARSID accidents have occurred around small or medium
size trees.
Prevention of falling into a tree well is all-important because the odds of
surviving deep snow immersion are low. Remember, in two experiments
conducted in the U.S. and Canada in which volunteers were temporarily placed
in a tree well, 90% COULD NOT rescue themselves.
For your safety, you should assume all trees have a hazardous tree well.
Fortunately, the risk of falling into a tree well is completely avoidable.
Tree wells exist in deep snow areas and only around trees Ðin simple
terms, a tree well is a hole in the deep snow, which is clearly marked by a
tree. You can easily identify and avoid these areas.
An actual location of a tree well fatality
更多详细信息请到网站阅读：
http://www.treewelldeepsnowsafety.com/ | d*********e
发帖数: 3835 | | n****7
发帖数: 8354 | 3 Good to know what tree well is. | s********y
发帖数: 660 | 4 学习了。。。
environment
U
.
【在 q*c 的大作中提到】
: http://www.treewelldeepsnowsafety.com/
: What exactly is a tree well?
: Trees are an important and integral part of the natural mountain environment
: . Thick stands of evergreen trees are common at ski resorts in the western U
: .S. and Canada, predominantly in the ungroomed areas.
: Most of the documented cases of deep snow suffocation at ski areas involve
: people falling headfirst into a tree well.
: A tree well is the hole or depression that forms around the base of a tree.
: Evergreen trees (fir, hemlock, etc) can have large, deep tree wells that
: form when low hanging branches prohibit snow from filling in and
| S******t
发帖数: 112 | 5 谢谢分享
看来，钻树林一定要团体，还要大家都要在视线内才行 | M***a
发帖数: 1447 | 6 强帖
environment
U
.
【在 q*c 的大作中提到】
: http://www.treewelldeepsnowsafety.com/
: What exactly is a tree well?
: Trees are an important and integral part of the natural mountain environment
: . Thick stands of evergreen trees are common at ski resorts in the western U
: .S. and Canada, predominantly in the ungroomed areas.
: Most of the documented cases of deep snow suffocation at ski areas involve
: people falling headfirst into a tree well.
: A tree well is the hole or depression that forms around the base of a tree.
: Evergreen trees (fir, hemlock, etc) can have large, deep tree wells that
: form when low hanging branches prohibit snow from filling in and
| i***r
发帖数: 1885 | | q*c
发帖数: 17993 | 8 http://www.treewelldeepsnowsafety.com/
What exactly is a tree well?
Trees are an important and integral part of the natural mountain environment
. Thick stands of evergreen trees are common at ski resorts in the western U
.S. and Canada, predominantly in the ungroomed areas.
Most of the documented cases of deep snow suffocation at ski areas involve
people falling headfirst into a tree well.
A tree well is the hole or depression that forms around the base of a tree.
Evergreen trees (fir, hemlock, etc) can have large, deep tree wells that
form when low hanging branches prohibit snow from filling in and
consolidating around the base of the tree. These holes are hidden from view
by the tree's low hanging branches.
One step into the tree well and the person here is 6 feet tall.
IMPORTANT TREE WELL FACTS
Hazardous tree wells are generally found in ungroomed areas. You must also
be careful next to trees on the edges of groomed trails.
Particularly hazardous trees are fir trees that have their lower branches
touching the snow surface. The branches help form a canopy over the tree
well and can support a lot of snow on top of them. This snow is often
knocked off if a person falls through the branches into the tree well and
results in a deeper burial in the tree well.
There is no easy way to identify if a particular tree has a dangerous tree
well by sight. The branches often block visibility of the hole that may
exist. Even very small trees can have deep tree wells and have resulted in
burials. Many of the NARSID accidents have occurred around small or medium
size trees.
Prevention of falling into a tree well is all-important because the odds of
surviving deep snow immersion are low. Remember, in two experiments
conducted in the U.S. and Canada in which volunteers were temporarily placed
in a tree well, 90% COULD NOT rescue themselves.
For your safety, you should assume all trees have a hazardous tree well.
Fortunately, the risk of falling into a tree well is completely avoidable.
Tree wells exist in deep snow areas and only around trees Ðin simple
terms, a tree well is a hole in the deep snow, which is clearly marked by a
tree. You can easily identify and avoid these areas.
An actual location of a tree well fatality
更多详细信息请到网站阅读：
http://www.treewelldeepsnowsafety.com/ | d*********e
发帖数: 3835 | | n****7
发帖数: 8354 | 10 Good to know what tree well is. | | | s********y
发帖数: 660 | 11 学习了。。。
environment
U
.
【在 q*c 的大作中提到】
: http://www.treewelldeepsnowsafety.com/
: What exactly is a tree well?
: Trees are an important and integral part of the natural mountain environment
: . Thick stands of evergreen trees are common at ski resorts in the western U
: .S. and Canada, predominantly in the ungroomed areas.
: Most of the documented cases of deep snow suffocation at ski areas involve
: people falling headfirst into a tree well.
: A tree well is the hole or depression that forms around the base of a tree.
: Evergreen trees (fir, hemlock, etc) can have large, deep tree wells that
: form when low hanging branches prohibit snow from filling in and
| S******t
发帖数: 112 | 12 谢谢分享
看来，钻树林一定要团体，还要大家都要在视线内才行 | M***a
发帖数: 1447 | 13 强帖
environment
U
.
【在 q*c 的大作中提到】
: http://www.treewelldeepsnowsafety.com/
: What exactly is a tree well?
: Trees are an important and integral part of the natural mountain environment
: . Thick stands of evergreen trees are common at ski resorts in the western U
: .S. and Canada, predominantly in the ungroomed areas.
: Most of the documented cases of deep snow suffocation at ski areas involve
: people falling headfirst into a tree well.
: A tree well is the hole or depression that forms around the base of a tree.
: Evergreen trees (fir, hemlock, etc) can have large, deep tree wells that
: form when low hanging branches prohibit snow from filling in and
| i***r
发帖数: 1885 | | r********e
发帖数: 84 | | q*c
发帖数: 17993 | 16 谢谢你的信息，原来链接过时了，我更新了。
【在 r********e 的大作中提到】
: 谢谢楼主，非常重要的知识。这个网站有更多的信息，包括视频：
: http://www.deepsnowsafety.org/index.php/
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