Windthrow risk diagnosis for park trees based on the drag coefficients of tree crowns and the measurement of tree form
| Project/Area Number |
21580169
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Forest science
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| Research Institution | Hokkaido University |
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Principal Investigator |
KOIZUMI Akio 北海道大学, 大学院・農学研究院, 准教授 (40183040)
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| Co-Investigator(Kenkyū-buntansha) |
SAWATA Kei 北海道大学, 大学院・農学研究院, 助教 (10433145)
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| Co-Investigator(Renkei-kenkyūsha) |
HIRAI Takuro 北海道大学, 大学院・農学研究院, 教授 (20173205)
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| Project Period (FY) |
2009 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2012: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2009: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 緑化・環境保全林 / 風倒害 / 風害 / 抗力係数 / 屋上緑化 / 樹木 / 緑化木 / 根返り / 応力緩和 / 断面係数 / 土壌含水率 / 数値計算 / 危険度評価 / 野外試験 / 幹折れ |
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| Research Abstract |
Methods of quantitative evaluation for windthrow risk of park trees were discussed in order to propose a procedure for windthrow diagnosis. A field test method was developed to evaluate drag coefficients of trees, using measured data of wind speed and stem deflection. The moment acting on stem and root-soil plate can be calculated as a function of wind speed, using the obtained drag coefficients. To evaluate windthrow resistance with respect to stem breakage, a nondestructive method for determining the shape of a trunk cross section was developed. Furthermore, pull-down tests of park trees were conducted
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Report
(5 results)
Research Products
(16 results)
