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Development of Estimation Method for Wind Load on Forest Trees

Research Project

Project/Area Number 09480081
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field Natural disaster science
Research InstitutionCHIBA UNIVERSITY

Principal Investigator

MATSUOKA Nobuhiro  Chiba University, Faculty of Horticulture, Associate Proffessor, 園芸学部, 助教授 (80212215)

Co-Investigator(Kenkyū-buntansha) MATSUMURA Shinji  Kagawa University, Faculty of Agriculture, Assistant Proffessor, 農学部, 助手 (60165868)
SUZUKI Jun  Shinshu University, Faculty of Agriculture, Associate Proffessor, 農学部, 助教授 (40262696)
KON Hisashi  Chiba University, Faculty of Horticulture, Proffessor, 園芸学部, 教授 (60153706)
于 貴瑞  千葉大学, 園芸学部, 助教授 (60280921)
Project Period (FY) 1997 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥13,900,000 (Direct Cost: ¥13,900,000)
Fiscal Year 2000: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1999: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1998: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1997: ¥10,500,000 (Direct Cost: ¥10,500,000)
KeywordsStrong wind damage / Agricultural and forestry damage / forest / wind damage / strong wind / moment flux / load / canopy / 抵抗係数 / 粗度 / 葉面積指数 / 風倒 / 森林災害 / キャノピ-
Research Abstract

Meteorological observation around the Japanese cypress canopy was carried out in the experimental forest of Shinshu University, Minami-Minowa village in Nagano prefecture, Japan. We measured wind load on trees from wind speed profile and momentum flux observation. The results are :
1)The momentum flux is constant for height over the forest canopy and is absorbed in the upper part of the canopy.
2)Peak of wind speed was observed in the trunk space of the forest. Therefore, we cannot neglect the momentum flux beneath the canopy.
3)The momentum flux is constant at the same height for the forest.
Using these results and wind speed profiles, the relationship between drag coefficient and LAI of the forest canopy was investigated. Larger wind speed makes the coefficient smaller and the critical value is 0.2 for the canopy. The value is smaller than that for Picea abis and Tsuga heterophylla because we underestimated momentum flux under the canopy. Considering the result above, we proposed the equation to estimate the drag coefficient from roughness, displacement height, tree height and LAI.We tested this equation for three types of forests and the results were agreeing in the practical levels. Next, we simplified this equation with tree height and LAI.It is almost sufficient to estimate the coefficient.

Report

(5 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] Nobuhiro MATSUOKA: "Diurnal change of CO2 concentration in a deciduous forest canopy ; Case study in summer"J.Agric.Meteorol.. 52. 485-488 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 出羽秀章: "森林の風に対する抵抗係数について"関東の農業気象. 37-38 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Gui-Rui Yu: "A proposal for universal formulas for estimating leaf water status of herbaceous and woody plants based on spectral reflectance properties"Plant and Soil. 227. 47-58 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 松村伸二: "ガラスハウスで生成される結露水を利用した渇水対策"自然災害科学. 19. 329-338 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 鈴木純: "深根性の飼料用作物に効果的な灌漑方式"農業土木学会論文集. 196. 1-8 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Md.Abdul Baten: "Diurnal Patterns of Eneergy Balance Components as Influenced by Row Orientations Potato"Pakistan Journal of Biological Sciences. 4・1. 20-23 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] MATSUOKA et al.: "Diurnal change of CO2 concentration in a deciduous forest canopy ; Case study in summer"J.Agric.Meteorol. 52. 485-488 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] DEWA et al.: "About Drag coefficient for forest canopy"Agricultural Meteorology in KANTO region. 37-38 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Gui-Rui Yu et al.: "A proposal for universal formulas for estimating leaf water status of herbaceous and woody plants based on spectral reflectance properties"Plant and Soil. 227. 47-58 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Matsumura S.: "The Use of the condensed dew on the glass of greenhouse as a Countermeasures against the water shortage"Natural Disaster Science. 19. 329-338 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Suzuki: "Effective irrigation method for forage crops with deep root"Transactions of JSIDRE. 196. 1-8 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Batsen M.A.: "Diurnal Patterns of Eneergy Balance Components as Influenced by Row Orientations Of Potato"Pakistan Journal of Biological Sciences. 4(1). 20-23 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 出羽秀章 他: "森林の風に対する抵抗係数について"第19回日本自然災害学会学術講演会要旨. 169-170

    • Related Report
      2000 Annual Research Report
  • [Publications] 出羽秀章,松岡延浩,鈴木純,今久,松村伸二: "森林の風に対する抵抗係数について"関東の農業気象. 第25号. 37-38 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 松岡延浩,出羽秀章,今久,鈴木純,松村伸二: "樹種による風に対する抵抗係数の差異"第18回日本自然災害学会講演会講演概要集. 139-140 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 出羽秀章 他: "ヒノキ林の風に対する抵抗係数の算出" 日本自然災害学会学術講演会講演概要集. 17. 111-112 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 松岡延浩 他: "風が森林樹木に与える風の測定" 日本自然災害学会学術講演会要旨集. 17. (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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