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tree well
A tree well is a void or area of loose snow around the trunk of a tree enveloped in deep snow. Also known as "spruce traps", these voids present danger to hikers, snowshoers, skiers, and snowboarders who fall into them.
==Formation==
A tree's branches shelter its trunk from snowfall, allowing a void or area of loose snow to form. Low-hanging branches as on small firs further contribute to forming a tree well, as they efficiently shelter the area surrounding the trunk. Such wells have been observed as deep as 20 feet.〔(【引用サイトリンク】 accessdate=2014-12-07 )〕 They can also occur near rocks and along streams.
Tree wells may be encountered in backcountry, on ungroomed trails, off-piste, and on ungroomed/piste boundaries. The risk of encountering one is greatest during and immediately following a heavy snowstorm.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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