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Assessment of vegetation and landslide hazard using innovative approaches

Research Project

Project/Area Number 20K20736
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 4:Geography, cultural anthropology, folklore, and related fields
Research InstitutionNagoya University (2022)
Kanto Gakuin University (2020-2021)

Principal Investigator

Saito Hitoshi  名古屋大学, 環境学研究科, 准教授 (00709628)

Co-Investigator(Kenkyū-buntansha) 手代木 功基  摂南大学, 国際学部, 講師 (10635080)
内山 庄一郎  国立研究開発法人防災科学技術研究所, マルチハザードリスク評価研究部門, 特別研究員 (30507562)
Project Period (FY) 2020-07-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2020: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywords斜面崩壊 / 土砂災害 / 草原 / 植生回復 / ドローン / 高精細地形情報 / 阿蘇山 / 草地景観 / 高精細地形 / 草地 / 植生景観 / ハイパースペクトル / 機械学習
Outline of Research at the Start

本研究の目的は、植生景観をその形成過程(過去の人為的影響)を含めて明らかにし、その植生景観に伴い変化する将来の土砂災害リスクを評価することである。本研究では、新たにハイパースペクトルカメラ観測(光を波長ごとに細分化して撮影するカメラ)と機械学習(ニューラルネットワーク)を導入し、植生景観と土砂災害リスクとの複雑な関係性を分析・統合する。

Outline of Final Research Achievements

Vegetation cover is an important factor in hillslope stability. The objective of this study is to explore topographic characteristics and vegetation recovery in rainfall-induced and coseismic landslide scars at the Aso volcano in Japan. We focus on the temporal changes and effect of topography on vegetation recovery using multitemporal satellite images from 2010 to 2020, and finer spatial resolution data from unmanned aerial vehicles. This study validates grass vegetation recovery using the normalized difference vegetation index (NDVI). The NDVI rapidly increases in landslide scars after the events. The results indicate that NDVI at both landslide scars will reach the same level as the pre-landslide grass vegetation within 12 years. The slope aspect direction determines the topographic effects of grass vegetation recovery. The north- to west-facing landslide scars seemed to experience rapid grass vegetation recovery.

Academic Significance and Societal Importance of the Research Achievements

斜面崩壊は、土砂災害を引き起こすとともに、主要な植生の攪乱要因である。また崩壊跡地での植生回復は、斜面の安定性や生態系を検討する上で重要である。本研究では、阿蘇山の草原での斜面崩壊地の特徴や、崩壊跡地が約10~12年程度でもとの草原景観に戻る結果、及び斜面の地形による回復状況の違いを示した。これらの結果は、阿蘇山で頻発する斜面崩壊の脆弱性評価や、斜面崩壊と草地景観との関係を検討する上で重要である。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (7 results)

All 2022 2021 2020 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (4 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results) Remarks (1 results)

  • [Journal Article] Rapid vegetation recovery at landslide scars detected by multitemporal high-resolution satellite imagery at Aso volcano, Japan2022

    • Author(s)
      Saito Hitoshi、Uchiyama Shoichiro、Teshirogi Koki
    • Journal Title

      Geomorphology

      Volume: 398 Pages: 107989-107989

    • DOI

      10.1016/j.geomorph.2021.107989

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Modeling impacts of broad-scale plantation forestry on ecosystem services in the past 60 years and for the future2021

    • Author(s)
      Yamaura Yuichi、Yamada Yusuke、Matsuura Toshiya、Tamai Koji、Taki Hisatomo、Sato Tamotsu、Hashimoto Shoji、Murakami Wataru、Toda Kenichiro、Saito Hitoshi、Nanko Kazuki、Ito Eriko、Takayama Norimasa、Tsuzuki Nobuyuki、Takahashi Masayoshi、Yamaki Kazushige、Sano Makoto
    • Journal Title

      Ecosystem Services

      Volume: 49 Pages: 101271-101271

    • DOI

      10.1016/j.ecoser.2021.101271

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] 阿蘇山の半自然草原における斜面崩壊が植生に与える影響2022

    • Author(s)
      手代木功基・齋藤 仁・内山庄一郎
    • Organizer
      2022年日本地理学会秋季学術大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Rapid vegetation recovery at landslide scars detected by multitemporal high-definition data.2021

    • Author(s)
      Saito, H., Uchiyama, S. and Teshirogi, K.
    • Organizer
      Japan Geoscience Union Meeting 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 阿蘇山の崩壊跡地での急速な植生回復-コンステレーション衛星画像の分析-2021

    • Author(s)
      齋藤 仁・内山庄一郎・手代木功基
    • Organizer
      東京大学空間情報科学研究センター研究発表大会(CSIS DAYS 2021)「全国共同利用研究発表大会」
    • Related Report
      2021 Research-status Report
  • [Presentation] Detection of landslides and vegetation recovery from multitemporal UAV and satellite images.2020

    • Author(s)
      Saito, H., Uchiyama, S., Hayakawa, Y.S. and Obanawa, H.
    • Organizer
      Japan Geoscience Union Meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks] 鳥の目でみる山崩れと植生の回復

    • URL

      https://www.env.nagoya-u.ac.jp/teacher/20220517/index.html

    • Related Report
      2022 Annual Research Report

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Published: 2020-08-03   Modified: 2024-01-30  

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