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発表 RELATIONSHIP BETWEEN TREE DENSITY AND VISIBILITY IMPROVEMENT FOR HIGHWAY SNOWBREAK WOODS

作成年度 2009年度
論文名 RELATIONSHIP BETWEEN TREE DENSITY AND VISIBILITY IMPROVEMENT FOR HIGHWAY SNOWBREAK WOODS
論文名(和訳) 防雪林の視程改善効果と樹木密度の相関
論文副題
発表会 第13回PIARC国際冬期道路会議
誌名(No./号数)
発表年月日 2010/02/08 ~ 2010/02/11
所属研究室/機関名 著者名(英名)
雪氷チーム伊東 靖彦(ITO Yasuhiko)
雪氷チーム山田 毅(YAMADA Takeshi)
雪氷チーム松澤 勝(MATSUZAWA Masaru)
抄録
In highway snowbreak woods that have grown to maturity、 the branches of adjacent trees overlap and the leaves shade each other. This causes branches near the ground to die. Such dying allows snow to penetrate through the woods、 which reduces visibility on the road. To prevent low branches from dying、 stand thinning at the appropriate time is necessary. However、 such thinning reduces tree density、 which raises concerns about temporary reductions in visibility improvement. Because of this concern、 there are highway snowbreak woods that have not been properly thinned. [*][*]To examine the relationship between the tree density of highway snowbreak woods and the visibility improvement they afford、 the authors conducted field surveys and wind tunnel tests. From those surveys and tests、 the minimum tree density that maintains visibility improvement was determined.[*][*]The study found the following:[*]1) Highway snowbreak woods improve visibility under snowstorm conditions.[*]2) The tree density of a snowbreak woods greatly influences the visibility improvement afforded by the woods.[*]3) Leaf-area index influences visibility improvement.[*]4) To improve visibility、 the tree density for a 32-m-wide snowbreak woods should be at least 400 trees per hectare.
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