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Mechanisms and risk evaluation of meltwater-induced landslides on forest-covered slopes during strong wind

Research Project

Project/Area Number 16H03151
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Natural disaster / Disaster prevention science
Research InstitutionKyoto University

Principal Investigator

Matsuura Sumio  京都大学, 防災研究所, 教授 (10353856)

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)
松四 雄騎  京都大学, 防災研究所, 准教授 (90596438)
Research Collaborator OKAMOTO Takashi  
KAMIISHI Isao  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2018: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2017: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2016: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000)
Keywords積雪地帯 / 強風時の融雪 / 積雪層内水移動 / 積雪荷重 / 浸透能 / 土壌水分 / 間隙水圧 / 地すべり / 地盤災害 / 極端気象 / 融雪 / 森林斜面 / 融雪特性 / 積雪層内浸透過程 / 間隙水圧の変動特性
Outline of Final Research Achievements

To evaluate the landslide hazard caused by meltwater on a forested slope during strong wind, we carried out field observations and in-situ tests in a heavy snowfall area in addition to laboratory experiments and numerical simulations. As a result of the laboratory experiments and field observations, turbulent flow generated near the canopy in a relatively sparse forest stand can cause a large amount of snow melting. Because the meltwater infiltrates the snowpack and then forms complex water pathways, meltwater flows out locally, and we reproduced this phenomenon by numerical models. Based on long-term results of deep pore-water pressure in snow-covered conditions, the magnitude of the pore-water pressure increase tends to be relatively suppressed because of the seasonal decrease in the permeability of the surface soils and a decrease in the volume of the vadose zone. These research results should help improve the accuracy of landslide risk evaluation in heavy snowfall areas.

Academic Significance and Societal Importance of the Research Achievements

気温による融雪予測は研究蓄積も数多くある。一方、積雪層に雨が降る場合は雨の観測が容易なうえに融雪熱量も計算しやすい。ところが、風による融雪は発生頻度が少ないため、他の融雪要因の研究に比べ大幅に遅れている。また、前二者については、「気温上昇=融雪促進」、「降雨=災害多発」というイメージがあることから、災害に対する注意を喚起しやすい。ところが、風による融雪については強風で急激に雪が融けることが、必ずしも流域内の住民に共有されていない。本研究で強風時の融雪現象が明らかとなり、地すべり発生危険度評価の精度を高めることができた。したがって積雪地帯における地域住民の安心と安全の確保に寄与できる。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • Research Products

    (25 results)

All 2018 2017 2016

All Journal Article (8 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 8 results) Presentation (17 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Seasonal transition of hydrological processes in a slow-moving landslide in a snowy region2018

    • Author(s)
      Osawa, H., Matsushi, Y., Matsuura, S., Okamoto, T. Shibasaki, T., Hirashima H.
    • Journal Title

      Hydrological Processes

      Volume: 32 Issue: 17 Pages: 2695-2707

    • DOI

      10.1002/hyp.13212

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The response of pore water pressure to snow accumulation on a low-permeability clay landslide2018

    • Author(s)
      Okamoto, T., Matsuura, S., Larsen, J. O., Asano, S. and Abe, K.
    • Journal Title

      Engineering Geology

      Volume: 242 Pages: 130-141

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Influences of the snow cover on landslide displacement in winter period: A case study in a heavy snowfall area of Japan2017

    • Author(s)
      Matsuura, S., Okamoto, T., Asano, S., Osawa, H. and Shibasaki, T.
    • Journal Title

      Environmental Earth Sciences

      Volume: 76:362 Issue: 10 Pages: 1-10

    • DOI

      10.1007/s12665-017-6693-7

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Coupling fluvial processes and landslide distribution toward geomorphological hazard assessment: A case study in a transient landscape in Japan2017

    • Author(s)
      Tsou, C-.Y., Chigira, M., Matsushi, Y., Hiraishi, N. and Arai, N.
    • Journal Title

      Landslides

      Volume: 14(6) Issue: 6 Pages: 1901-1914

    • DOI

      10.1007/s10346-017-0838-3

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 樹木模型を用いた予備的な融雪実験2017

    • Author(s)
      中町聡、松浦純生、平島寛行、阿部修、阿部和時
    • Journal Title

      日本雪工学会誌

      Volume: 33(3) Pages: 10-15

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 宇宙線生成核種を用いた岩盤の風化と土層の生成に関する速度論 ─手法の原理、適用法、研究の現状と課題─2017

    • Author(s)
      松四雄騎
    • Journal Title

      地学雑誌

      Volume: 126 Pages: 487-511

    • NAID

      130006105227

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 南砺市上百瀬で発生した土砂災害2017

    • Author(s)
      古谷元、村尾英彦、松浦純生
    • Journal Title

      砂防学会誌

      Volume: 70(2) Pages: 26-29

    • NAID

      130007405584

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Seasonal change in permeability of surface soils on a slow-moving landslide in a heavy snow region2017

    • Author(s)
      H. Osawa, S. Matsuura, Y. Matsushi, T. Okamoto
    • Journal Title

      Engineering Geology

      Volume: 221 Pages: 1-9

    • DOI

      10.1016/j.enggeo.2017.02.019

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed
  • [Presentation] 積雪層内における選択流に関する野外実験2018

    • Author(s)
      大澤光、松四雄騎、松浦純生、平島寛行、阿部修、岡本隆
    • Organizer
      雪氷研究大会(2018・札幌)
    • Related Report
      2018 Annual Research Report
  • [Presentation] 融雪地すべりの予測に向けた積雪モデルの応用2018

    • Author(s)
      平島寛行、松浦純生、大澤光、阿部修、岡本隆
    • Organizer
      第57回日本地すべり学会研究発表会(新潟)
    • Related Report
      2018 Annual Research Report
  • [Presentation] 再活動型地すべり地における降水に対する間隙水圧変動の予測2018

    • Author(s)
      大澤光、松四雄騎、松浦純生、岡本隆
    • Organizer
      第57回日本地すべり学会研究発表会(新潟)
    • Related Report
      2018 Annual Research Report
  • [Presentation] 積雪地帯の堆積性軟岩を基盤とする地すべり地における水文過程の季節的遷移2018

    • Author(s)
      大澤光、松浦純生、松四雄騎、岡本隆、柴崎達也、平島寛行
    • Organizer
      平成29年度 京都大学防災研究所研究発表講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 積雪期の斜面変動場における特異な間隙水圧変動2017

    • Author(s)
      大澤光、松浦純生、松四雄騎、岡本 隆、柴崎達也
    • Organizer
      平成28年度 京都大学防災研究所研究発表講演会
    • Place of Presentation
      京都大学防災研究所
    • Year and Date
      2017-02-21
    • Related Report
      2016 Annual Research Report
  • [Presentation] Seasonal fluctuation in pore-water pressure of a landslide in a seasonal snow cover region2017

    • Author(s)
      Osawa, H., Matsuura, S., Matsushi, Y. and Okamoto, T.
    • Organizer
      4th Slope techtonics conference
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 融雪土砂災害予測にむけて積雪モデルの応用(2)-積雪中における水みちの土壌浸透への影響-2017

    • Author(s)
      平島寛行・松浦純生・大澤光・阿部修・岡本隆
    • Organizer
      雪氷研究大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 積雪地帯の堆積性軟岩を基盤とする地すべり地における水文過程の季節的遷移2017

    • Author(s)
      大澤光、松浦純生、松四雄騎、岡本隆、柴崎達也、平島寛行
    • Organizer
      平成29年度 京都大学防災研究所研究発表講演会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 季節積雪地帯の地すべり地における間隙水圧の季節変動2017

    • Author(s)
      大澤光、松浦純生、岡本隆、平島寛行
    • Organizer
      第56回日本地すべり学会研究発表会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Dating a large-scale debris flow event using terrestrial cosmogenic nuclide: an attempt in Marshyangdi River, central Nepal2017

    • Author(s)
      Matsushi, Y., Yagi, H. and Matsuzaki, H.
    • Organizer
      11th Asian Regional Conference of IAEG. Kathmandu, Nepal
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Multi-scale mass movements in a dip slope of accretionary complex with contact metamorphism and extensive high-angle faulting: a case in Hira Range, central Japan2017

    • Author(s)
      Matsushi, Y. and Hiramatsu, H.
    • Organizer
      4th Slope Tectonics Conference, Kyoto
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 地すべり地における地下水の変動特性2017

    • Author(s)
      松浦純生
    • Organizer
      地すべり学会シンポジウム
    • Related Report
      2017 Annual Research Report
  • [Presentation] メソスケールの擾乱による融雪と地すべり2017

    • Author(s)
      松浦純生、岡本隆、平島寛行、阿部 修、石川裕彦、土井一生、大澤光、柴崎達也
    • Organizer
      雪氷研究大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 温帯雪氷圏における降積雪変動と雪氷災害の変容の解明に向けて2017

    • Author(s)
      河島克久、松浦純生、松元高峰、伊豫部勉、平松和彦、本田明治、立花義裕
    • Organizer
      雪氷研究大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 地すべり地における浅層地盤の地温の季節変動特性と積雪深分布2017

    • Author(s)
      柴崎達也、松浦純生、岡本隆、大澤光
    • Organizer
      第56回日本地すべり学会研究発表
    • Related Report
      2017 Annual Research Report
  • [Presentation] 融雪土砂災害予測にむけて積雪モデルの応用2016

    • Author(s)
      平島寛行、松浦純生、大澤光、阿部修、岡本 隆
    • Organizer
      雪氷研究大会 (2016・名古屋)
    • Place of Presentation
      名古屋大学
    • Year and Date
      2016-09-29
    • Related Report
      2016 Annual Research Report
  • [Presentation] 積雪期の地すべり地における特異な間隙水圧変動2016

    • Author(s)
      大澤光、松浦純生、松四雄騎、岡本 隆、柴崎達也
    • Organizer
      第55回日本地すべり学会研究発表会
    • Place of Presentation
      高知県立県民文化ホール
    • Year and Date
      2016-08-24
    • Related Report
      2016 Annual Research Report

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Published: 2016-04-21   Modified: 2020-03-30  

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