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Study on the braking effect of forests on flowing avalanches

Research Project

Project/Area Number 15K01271
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Natural disaster / Disaster prevention science
Research InstitutionForest Research and Management Organization

Principal Investigator

Takeuchi Yukari  国立研究開発法人森林研究・整備機構, 森林総合研究所, 主任研究員 等 (90353755)

Co-Investigator(Kenkyū-buntansha) 平島 寛行  国立研究開発法人防災科学技術研究所, 雪氷防災研究部門, 主任研究員 (00425513)
西村 浩一  名古屋大学, 環境学研究科, 教授 (10180639)
Project Period (FY) 2015-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords雪崩 / 森林
Outline of Final Research Achievements

Mountain forests have a role of decelerating and stopping flowing snow avalanches. In this study, we ascertained forest braking effect by numerical simulations using the avalanche dynamics program, TITAN2D, to model large-scale avalanches. One of these avalanches occurred in the Makunosawa valley, Myoko, and damaged a cedar forest; the others occurred on Mt. Iwate and damaged a subalpine forest. In our simulations, the resistance of the forests to avalanches is simulated using a larger bed friction angle. Simulations reveal that without the forest, the avalanche would have traveled at least 200 m farther than the forest’s actual end in the Makunosawa valley, and at least 200 m and possibly up to 600 m farther on Mt. Iwate. This study therefore clearly shows that forests provide a braking effect for avalanches.

Academic Significance and Societal Importance of the Research Achievements

流下する雪崩に対する森林の減勢効果については、早くから経験的に知られていたが、定量的に示した研究はほとんどなかった。本研究では森林がないと仮定した場合には、雪崩は実際より長距離を流下することを数値モデルのシミュレーションで示し、森林の減勢効果を定量的に示したことに学術的な意義がある。さらにこの成果は、災害軽減効果の高い森林の配置を具体的に示すことに貢献でき、社会的な意義もある。

Report

(6 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (10 results)

All 2020 2019 2018 2017 2016 2015

All Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (6 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] 森林は流れ下る雪崩の進行を止められるのか2020

    • Author(s)
      竹内由香里
    • Journal Title

      森林科学

      Volume: 88 Pages: 3-7

    • NAID

      130007804932

    • Related Report
      2019 Annual Research Report
  • [Journal Article] 雪崩の流下を妨げる森林の減勢効果2019

    • Author(s)
      竹内由香里
    • Journal Title

      森林と林業

      Volume: 1月号 Pages: 14-15

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Observations and numerical simulations of the braking effect of forests on large-scale avalanches2019

    • Author(s)
      TAKEUCHI Yukari, NISHIMURA Koichi, PATRA Abani
    • Journal Title

      Annals of Glaciology

      Volume: 77 Issue: 77 Pages: 1-9

    • DOI

      10.1017/aog.2018.22

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 雪崩災害を軽減する森林のはたらき2016

    • Author(s)
      竹内由香里
    • Journal Title

      山林

      Volume: 1591 Pages: 18-27

    • NAID

      40021021543

    • Related Report
      2016 Research-status Report
  • [Presentation] 低気圧性降雪で形成された新雪の密度, 硬度, せん断強度の関係2019

    • Author(s)
      竹内由香里、勝島隆史、本吉弘岐
    • Organizer
      日本雪氷学会北信越支部大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 秋田県湯沢市泥湯温泉で2018年2月13日に発生した雪崩の調査(速報)2018

    • Author(s)
      竹内由香里,勝島隆史,浅利一成,井良沢道也,落合博貴
    • Organizer
      日本雪氷学会北信越支部
    • Related Report
      2018 Research-status Report
  • [Presentation] Observations and numerical simulations of the braking effect of forest on large-scale avalanches2018

    • Author(s)
      TAKEUCHI Yukari, NISHIMURA Koichi, PATRA Abani
    • Organizer
      International Symposium on Cryosphere and Biosphere
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 雪崩災害を軽減する森林のはたらき2017

    • Author(s)
      竹内由香里
    • Organizer
      第10回災害環境科学セミナー
    • Place of Presentation
      新潟大学 (新潟県新潟市)
    • Related Report
      2016 Research-status Report
    • Invited
  • [Presentation] 岩手山西斜面の雪崩に対する森林の減勢効果2015

    • Author(s)
      竹内由香里、西村浩一
    • Organizer
      日本雪氷学会北信越支部研究発表会・製品発表検討会
    • Place of Presentation
      信州大学理学部
    • Year and Date
      2015-06-06
    • Related Report
      2015 Research-status Report
  • [Presentation] Numerical simulation of snow avalanche on the west-facing slope of Mt. Iwate, Japan2015

    • Author(s)
      TAKEUCHI Yukari, NISHIMURA Koichi
    • Organizer
      日本地球惑星科学連合2015大会
    • Place of Presentation
      幕張メッセ国際会議場
    • Year and Date
      2015-05-25
    • Related Report
      2015 Research-status Report

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Published: 2015-04-16   Modified: 2021-02-19  

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