Evaluation of drag force of trees damaged from storm and flood

风暴和洪水损坏树木的阻力评估

• 批准号: 20510178
• 负责人: NAGABAYASHI Hisao
• 金额: $ 3.08万
• 依托单位: Nihon University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20510178/
• 关键词: 気象災害; 水災害; 風水害; 樹木の抗力評価; 倒伏・破断モーメント評価; 強風災害; 引き倒し試験; 倒伏モーメント; 抗力実験; Y字型単一樹木; 透過係数; 被災調査; 引き倒し実験; 樹木曲げ破壊実験; 破断モーメント

Evaluation of drag force of trees damaged by storm and flood, the mechanism of collapse and the break were examined from the experiment and the field survey. The following were examined from the model experiment. The drag that combined the branch and the leaves would allot 90% at the strong wind, and it was clarified that the drag evaluation of the canopy was important though the leaves in the low wind was an effect of 60% allotment. The following were examined from the field survey. The age of a tree was about 20 years in the collapsing tree, and the breaking showed no relation to the age of a tree. The collapse moment of the struck tree was clarified from the pulling down examination of the tree. The relation between the age of a tree and the tree form structure was requested. In addition, the bending test was executed, the flexural capacity of unseasoned wood was examined, the region of the collapse and the break was shown from the model analysis, and the mechanism was clarified.

通过试验和实地调查，研究了暴风雨和洪水损坏树木的阻力评估、倒塌和折断机理。通过模型实验检验了以下内容。强风时，树枝和树叶相结合的阻力将分配 90%，并且明确了树冠的阻力评估很重要，尽管低风中的树叶是 60% 分配的效果。通过实地调查，进行了以下检查。倒塌的树的树龄约为20年，而倒塌的树龄与树龄无关。通过对树木的推倒检查，可以明确被撞树木的倒塌时刻。要求树龄与树形结构之间的关系。此外，还进行了弯曲试验，检查了未干燥木材的弯曲能力，从模型分析中显示了塌陷和断裂的区域，并阐明了其机理。

项目成果

2008年2月強風による福島県荒川河道内樹木の被災について

关于2008年2月福岛县荒川河道因强风造成的树木受损

• 发表时间: 2009
• 期刊: 東北地域災害科学研究 Vol.45
• 作者: 山田泰正;長林久夫;サンジェイパリーク;二瓶昭弘
• 通讯作者: 二瓶昭弘

ホームページ等。

主页等

強風によって被災した樹木群の倒壊破断機構に関する検討

强风受损树群倒塌破坏机理研究

• 发表时间: 2010
• 期刊: 水工学論文集 Vol.54
• 作者: 山田泰正;長林久夫
• 通讯作者: 長林久夫

風応力によるか道内樹木の倒伏は段機構に関する検討

北海道风胁迫下树木倒伏阶梯机制的思考

• 发表时间: 2010
• 作者: 立尾有騎;佐藤博明;小嶋孝徳;山田泰正・長林久夫
• 通讯作者: 山田泰正・長林久夫

Collapse Trees Induced by Gust Disaster at the ARAKAWA RIVER on FEB 2008

2008 年 2 月荒川河阵风灾害导致树木倒塌

• 发表时间: 2010
• 期刊: IAHR-APD Congress 2010 7^<th> IUMEC (CDROM)
• 作者: Y. YAMADA;H. NAGABAYASHI
• 通讯作者: H. NAGABAYASHI