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Risk assesment of sediment disasters by multispectral imagery

Research Project

Project/Area Number 21K18790
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 25:Social systems engineering, safety engineering, disaster prevention engineering, and related fields
Research InstitutionShizuoka University

Principal Investigator

Imaizumi Fumitoshi  静岡大学, 農学部, 教授 (80378918)

Project Period (FY) 2021-07-09 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2023: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2022: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords土石流 / 分光反射特性 / 撹乱 / 攪乱 / 土砂災害 / マルチスペクトルカメラ / UAV
Outline of Research at the Start

静岡県北部「大谷崩(おおやくずれ)」を研究対象地とする。大谷崩では岩盤の風化により活発に土砂が生産されており,また毎年数回程度の頻度で土石流が流下することで,扇状地の森林植生が影響を受けている。UAV(ドローン)に搭載されたマルチスペクトルカメラおよび赤外線カメラにより,定期的に崩れ内部の様子を撮影し,分光反射特性に関わる指標を算出する。地形モデルや現地調査結果を検証データとし,分光反射特性を用いた1.岩盤からの風化による土砂生産の活発さの評価,2.渓流における土石流の流下頻度や経過年数の評価を試みる。そのうえで,分光反射特性を中山間地の防災システムへ活用する方法について検討する。

Outline of Final Research Achievements

Aim of this study is to clarify relationship between the sediment transport history and spectral reflection characteristics in the debris flow torrents. Field monitoring of the debris flow, analysis of debris flow records, and UAV photography of multi-spectral images were conducted in the Ohya landslide, north Shizuoka, central Japan. Our study clarified temporal changes in the reflection characteristics after occurrence of debris flow, mainly affected by the recovery of vegetation.We also demonstrated that grain size in the debris flow torrent can be automatically detected using high-resolution UAV images. UAV photogrammetry was also conducted in other large-scale landslides with different sediment transfer characteristics and geology. We conducted disciplinary studies with researchers from many academic fields such as spatial information science, geomorphology, and remote sensing science.

Academic Significance and Societal Importance of the Research Achievements

本研究により,地表面の分光反射特性が,土石流発生後の経過年数とともに変化することを示した。この研究成果は学際的な研究と,土石流の発生頻度が極めて高い流域で行った現地観測の結果得られたものであり,国際的にみても新規性が高い。この知見を用いれば,渓流の過去の土石流の発生履歴を1回のドローンを用いた調査により,推定することができるようになる。そのため,土砂災害への対策を立案するための調査への活用が期待される。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (22 results)

All 2024 2023 2022 2021 Other

All Int'l Joint Research (3 results) Journal Article (8 results) (of which Peer Reviewed: 8 results,  Open Access: 7 results) Presentation (10 results) (of which Int'l Joint Research: 5 results) Funded Workshop (1 results)

  • [Int'l Joint Research] University of Geneva(スイス)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] AREEO(イラン)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] University of Geneva(スイス)

    • Related Report
      2022 Research-status Report
  • [Journal Article] Field monitoring of pore water pressure in fully and partly saturated debris flows at Ohya landslide scar, Japan2024

    • Author(s)
      Oya Shunsuke、Imaizumi Fumitoshi、Takayama Shoki
    • Journal Title

      Earth Surface Dynamics

      Volume: 12 Issue: 1 Pages: 67-86

    • DOI

      10.5194/esurf-12-67-2024

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Depth-averaged mixture model for development processes of debris flows over a steep unsaturated mobile bed2024

    • Author(s)
      Takayama Shoki、Karasawa Reo、Imaizumi Fumitoshi
    • Journal Title

      Landslides

      Volume: - Issue: 6 Pages: 1173-1187

    • DOI

      10.1007/s10346-023-02202-8

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effects of Shallow Groundwater on Deep Groundwater Dynamics in a Slow-Moving Landslide Site2023

    • Author(s)
      Yokoyama, K., Egusa, T., Ikka, T., Yamashita, H., Imaizumi, F.
    • Journal Title

      International Journal of Erosion Control Engineering

      Volume: 16 Issue: 1 Pages: 1-12

    • DOI

      10.13101/ijece.16.1

    • ISSN
      1882-6547
    • Year and Date
      2023-03-17
    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Initiation and runout characteristics of partially saturated debris flows in Ohya landslide scar2023

    • Author(s)
      Imaizumi, F., Oya, S., Takayama, S.
    • Journal Title

      Proceedings of 8th International Conference on Debris Flow Hazard Mitigation

      Volume: 1 Pages: 03013-03013

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A Review of Groundwater Observation Methods for Slow-Moving Landslide2022

    • Author(s)
      Yokoyama, K., Imaizumi, F., Egusa, T.
    • Journal Title

      International Journal of Erosion Control Engineering

      Volume: 15 Issue: 2 Pages: 7-21

    • DOI

      10.13101/ijece.15.7

    • ISSN
      1882-6547
    • Year and Date
      2022-08-12
    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Debris flow disaster in Atami, Japan, in July 20212022

    • Author(s)
      Imaziumi, F., Osanai, N., Jato, S., Koike, M., Kosugi, K., Sakai, Y., Sakaguchi, H., Satofuka, Y., Takayama, S., Tanaka, T., Nishi, Y.
    • Journal Title

      International Journal of Erosion Control Engineering

      Volume: 15 Issue: 1 Pages: 1-6

    • DOI

      10.13101/ijece.15.1

    • ISSN
      1882-6547
    • Year and Date
      2022-06-06
    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 令和3年7月静岡県熱海市で発生した土石流災害2022

    • Author(s)
      今泉文寿・小山内信智・加藤真雄・小池優・小杉賢一朗・坂井祐介・坂口宏・里深好文・高山翔揮・田中隆文・西陽太郎
    • Journal Title

      砂防学会誌

      Volume: 74(5) Pages: 34-42

    • NAID

      40022812078

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Temporal changes in the debris flow threshold under the effects of ground freezing and sediment storage on Mt. Fuji2021

    • Author(s)
      Imaizumi, F., Ikeda, A., Yamamoto, K., Ohsaka, O.
    • Journal Title

      Earth Surface Dynamics

      Volume: 9 Issue: 6 Pages: 1381-1398

    • DOI

      10.5194/esurf-9-1381-2021

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 荒廃渓流源頭部における土石流流下特性と間隙水圧との関係2023

    • Author(s)
      高橋英成, 今泉文寿, 高山翔揮, 蓮容龍信
    • Organizer
      令和5年度砂防学会研究発表会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 渓流源頭部における土石流の発生・発達過程に関する研究2023

    • Author(s)
      高山翔揮, 今泉文寿
    • Organizer
      令和5年度砂防学会研究発表会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Grain Size Distribution Characteristics of Debris Flow Torent in Ohya Landslide, Central Japan2023

    • Author(s)
      Dahal., S., Imaizumi, F.
    • Organizer
      Japan Geoscience Union 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Field monitoring of pore-water pressure in debris flow2023

    • Author(s)
      Imaizumi, F., Oya, S., Takayama, S.
    • Organizer
      Japan Geoscience Union 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 地質の違いに着目した土石流発生に寄与する地形因子の検討:沖積錐分布に基づく決定木分析2022

    • Author(s)
      輿水健一,石丸聡,今泉文寿,川上源太郎
    • Organizer
      令和4年度砂防学会研究発表会
    • Related Report
      2022 Research-status Report
  • [Presentation] Effect of the landslides occurrence on the soil carbon/nitrogen loss in the southern Japanese Alps, Japan2022

    • Author(s)
      Satgada, C. P., Imaizumi, F., Egusa, T.
    • Organizer
      Alps, Japan Geoscience Union 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Linking long-term debris flow and typhon activity in the Japanese Alps: insights from tree-ring records2022

    • Author(s)
      Ballesteros Canovas, J. A., Nishii, R., Kariya, Y., Imaizumi, F., Matsuoka, N., Stoffel, M.
    • Organizer
      Japan Geoscience Union 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Runout characteristics of debris flow under effects of ground freezing on Mt. Fuji2022

    • Author(s)
      Imaizumi, F., Yamamoto, R., Ikeda, A.
    • Organizer
      Japan Geoscience Union 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 富士山大沢川における土砂流出形態と侵食堆積特性の関係2021

    • Author(s)
      今泉文寿、山本蓮、池田敦、逢坂興宏、柏原佳明、西村直記
    • Organizer
      令和3年度砂防学会研究発表会
    • Related Report
      2021 Research-status Report
  • [Presentation] 大谷崩における土石流の流動形態と間隙水圧の関係2021

    • Author(s)
      大屋俊祐、今泉文寿、堀田紀文、經隆悠、早川裕弌
    • Organizer
      令和3年度砂防学会研究発表会
    • Related Report
      2021 Research-status Report
  • [Funded Workshop] Landslides and related phenomena in JpGU 20222022

    • Related Report
      2022 Research-status Report

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Published: 2021-07-13   Modified: 2025-01-30  

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