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Development of biological and physical model for improvement of tsunami mitigation function of coastal forest and evaluation of forest management method

Research Project

Project/Area Number 19K04976
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 25030:Disaster prevention engineering-related
Research InstitutionHokkaido Research Organization

Principal Investigator

Torita Hiroyuki  地方独立行政法人北海道立総合研究機構, 森林研究本部, 研究参事 (50414264)

Co-Investigator(Kenkyū-buntansha) 田中 規夫  埼玉大学, 理工学研究科, 教授 (80323377)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords津波 / 流速 / 海岸林 / 被害 / クロマツ / 根返り / 幹折れ / 流体力指標 / 海岸防災林 / 森林管理 / 津波高 / 津波抵抗性 / 被害形態 / 浸水深 / 本数密度
Outline of Research at the Start

本研究は、生物・物理モデルを組み合わせ、津波に対して最適な防潮機能を発揮する海岸防災林の姿を提示し、同時にそれを実現させるための森林管理方法を解明する。対象樹種としては、我が国の海岸林造成主要樹種であるクロマツを中心に成長予測を実施して研究を進める。更に、この結果を踏まえて海岸林の津波抵抗性を評価する力学モデルと津波減衰効果を評価する流体モデルを用いて、海岸防災林の防潮機能を評価する。

Outline of Final Research Achievements

In order to increase the resistance of coastal forests to tsunamis and improve fluid force reduction effects, the influence of forest management on the tsunami resistance and fluid force reduction of Japanese black pine (Pinus thunbergii Parlat.) coastal forests were simulated using a numerical model for each growth stage of the forest. At the tsunami height of 5 m, no forest damage occurred except in the early growth stages. When the tsunami height exceeded 15 m, overturning or trunk-breakage occurred at all growth stages. The results also indicated that trees are prone to trunk breakage for forest management with a high stand density. At lower tsunami heights, the fluid force reduction was higher in forests with a wider forest width and a higher stand density. However, when the tsunami height exceeded 15 m, differences in forest width and stand density had little effect on the fluid force reduction.

Academic Significance and Societal Importance of the Research Achievements

東北地方太平洋沖地震津波による人的被害および経済的被害は甚大であり、津波発生の危険性が認識されるようになった。津波被害を軽減して海岸域を保全するためには、海岸林が防災機能を効果的に発揮することが期待される。本研究では、森林の管理手法と海岸林の津波抵抗性及び津波減衰効果の関係を定量的に評価した。その成果は、海岸林が防潮機能を発揮し、減災効果を発揮するための基礎的知見の一つとなる。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (5 results)

All 2022 2021 2020

All Journal Article (3 results) (of which Peer Reviewed: 3 results) Presentation (2 results)

  • [Journal Article] Effective management of Japanese black pine (Pinus thunbergii Parlat.) coastal forests considering tsunami mitigation2022

    • Author(s)
      Hiroyuki Torita, Yoshiya, Igarashi, NorioTanaka
    • Journal Title

      Journal of Environmental Management

      Volume: 311 Pages: 114754-114754

    • DOI

      10.1016/j.jenvman.2022.114754

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Assessment of the effect of thinning on the resistance of Pinus thunbergii Parlat. trees in mature coastal forests to tsunami fluid forces2021

    • Author(s)
      Hiroyuki Torita, Kazuhiko Masaka, NorioTanaka, Kenta Iwasaki, Satosi Hasui, Masato Hayamizu, Yasutaka Nakata
    • Journal Title

      Journal of Environmental Management

      Volume: 284 Pages: 111969-111969

    • DOI

      10.1016/j.jenvman.2021.111969

    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Influence of planting density and thinning on timber productivity and resistance to wind damage in Japanese larch (Larix kaempferi) forests2020

    • Author(s)
      Torita Hiroyuki , Masaka Kazuhiko
    • Journal Title

      Journal of Environmental Management

      Volume: 268 Pages: 110298-110298

    • DOI

      10.1016/j.jenvman.2020.110298

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] 津波および強風に対するクロマツ海岸林の抵抗性2021

    • Author(s)
      鳥田宏行
    • Organizer
      第69回北方森林学会大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 針葉樹の枝下高および枝下直径の推定2020

    • Author(s)
      鳥田宏行
    • Organizer
      第131回日本森林学会大会
    • Related Report
      2020 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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