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Climatic influence on the formation of weathering substances as possible slope failure materials

Research Project

Project/Area Number 21K04605
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 InstitutionSaitama University

Principal Investigator

Oguchi Chiaki  埼玉大学, 理工学研究科, 准教授 (20312803)

Co-Investigator(Kenkyū-buntansha) 若月 強  国立研究開発法人防災科学技術研究所, 水・土砂防災研究部門, 主任研究員 (80510784)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords崩壊予備物質 / 花こう岩 / 斜面災害 / 風化指標 / GIS / 崩壊 / 風化 / 土層 / マサ / 崩壊発生率 / DEM / 斜面傾斜 / 広島 / 石垣島 / 化学的風化 / 物理的風化 / 粒度分析 / 粘土シルト / 斜面崩壊 / 気候条件 / 土層構造
Outline of Research at the Start

土砂災害の発生予測の精度向上と減災を図るためには、あらゆる場所に適用可能かつ精度の高い風化土層発達の定量的・実用的な基本法則も考慮した指標を確立する必要がある。そのためには、崩壊予備物質である土層の物性の違いを明確にする必要がある。本研究では、斜面災害に岩石の風化と地域間比較の視点を入れ、岩石の風化、土層生成、斜面崩壊という一連の現象と気候条件との関係を体系化することを目指す。具体的には、過去に崩壊が発生した花こう岩質岩石を基盤にもつ地域において、未風化岩から風化土層にいたる物性を気候帯別に調査し、災害への脆弱性を示す評価基準を作成することを目的とする。

Outline of Final Research Achievements

The rock properties of basement rocks and weathered materials in several granitic zones were studied with the aim of systematising the relationship between the sequence of material changes - basement rock - weathering - collapse - and climatic conditions. Weathering indices were calculated from the physical properties obtained, and the characteristics of the weakened soil layers were shown in terms of the degree of weathering, as well as the relationship with the average annual temperature in each region. The results showed that the same granite weathered more in warmer regions, producing more fine-grained materials such as clay and reducing hydraulic conductivity. In terms of collapse rates and topographical characteristics such as slope gradient, the study showed that the highest collapse rates occurred at slope gradients of 30-35 degrees in Hiroshima (2014 disaster) and 45-50 degrees in Ishigaki-jima Island (2010 disaster).

Academic Significance and Societal Importance of the Research Achievements

本研究では、複数の気候下に置かれた花こう岩類を対象として、風化変質の状況とその生産物質である粘土や砂などの土層すなわち崩壊予備物質の物性の双方を比較考察した。このような崩壊予備物質の生成過程にまで言及した崩壊現象の研究例は僅少である。実際問題として、崩壊が発生した現地から土砂を採取して、毎回、綿密な化学分析を行うことは困難を極める。よって、崩壊予備物質の風化程度や透水係数の地域性に関する知見を得ておくことは、今後の温暖化に伴う崩壊予備物質の物性変化の推察に役立ち、その地域で発生し得る崩壊の特徴の変化を予測するための材料の一つになると考える。

Report

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

    (18 results)

All 2024 2023 2022 2021

All Journal Article (6 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 5 results,  Open Access: 6 results) Presentation (12 results)

  • [Journal Article] Research on the formation of weathering substances as reserve materials for collapse and climatic conditions2024

    • Author(s)
      Chiaki Oguchi, Tsuyoshi Wakatsuki, Imam Hasan
    • Journal Title

      Impact

      Volume: 1 Pages: 28-30

    • Related Report
      2023 Annual Research Report
    • Open Access / Int'l Joint Research
  • [Journal Article] Influence of landslide depth and geology on <i>α </i>- and <i>γ </i>-parameters in the landslide volume estimation equation: A case study of sediment disasters caused by the August 2014 heavy rainfall in the Tamba and Hiroshima areas, western Japan2023

    • Author(s)
      秋田寛巳,若月 強
    • Journal Title

      Journal of the Japan Society of Erosion Control Engineering

      Volume: 75 Issue: 5 Pages: 3-14

    • DOI

      10.11475/sabo.75.5_3

    • ISSN
      0286-8385, 2187-4654
    • Year and Date
      2023-01-15
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Effectiveness of water repellent coating on salt weathering of Japanese tuffs with various rock properties.2023

    • Author(s)
      Oguchi, C. T., Ikeda, Y.
    • Journal Title

      SWBSS ASIA 2023 First International Conference in Asia on Salt Weathering of Buildings and Stone Sculptures

      Volume: 1 Pages: 267-274

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A STUDY ON THE AUTOMATIC DETECTION OF LANDSLIDE FROM AERIAL PHOTOGRAPHS USING UNet AND UNet++2023

    • Author(s)
      河村 圭, 菅原 駿輔, 劉 小熙, 若月 強
    • Journal Title

      Japanese Journal of JSCE

      Volume: 79 Issue: 22 Pages: n/a

    • DOI

      10.2208/jscejj.22-22026

    • ISSN
      2436-6021
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Gypsum, mirabilite, and thenardite efflorescences of tuff stone in the underground environment2022

    • Author(s)
      Germinario, L., Oguchi, C.T.
    • Journal Title

      Environmental Earth Sciences

      Volume: 81:242 Issue: 8 Pages: 1-12

    • DOI

      10.1007/s12665-022-10344-6

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Weathering Rinds:Formation Processes and Weathering Rates2021

    • Author(s)
      Oguchi C. T.
    • Journal Title

      Treatise on Geomorphology, second edition, 3,

      Volume: 3 Pages: 189-203

    • DOI

      10.1016/b978-0-12-818234-5.00212-1

    • ISBN
      9780128182352
    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Study on the effect of pore diameter distribution on elastic wave velocities of various stone materials2023

    • Author(s)
      Takahashi, K. Oguchi, C. T.
    • Organizer
      Japan Geosciese Union 2023 meeting
    • Related Report
      2023 Annual Research Report
  • [Presentation] 長期風化に伴う花こう岩風化土層の粘土 シルト比と化学的指標値の気候依存性2022

    • Author(s)
      小口千明・中村 好・若月 強
    • Organizer
      第65回粘土科学討論会, 島根大学.(発表日 2022. 9. 7-8.)
    • Related Report
      2022 Research-status Report
  • [Presentation] 土壌・堆積物に対する重金属類の吸着挙動における温度依存性評価2022

    • Author(s)
      栗田桂吾, 斎藤健志, 小口千明, 川辺能成
    • Organizer
      第65回粘土科学討論会, 島根大学.(発表日 2022. 9. 7-8.)
    • Related Report
      2022 Research-status Report
  • [Presentation] A study on the applicability of non-destructive survey in Taya cave2022

    • Author(s)
      Oguchi, C. T., Noshiro, S. and Tamura Y.
    • Organizer
      Japan Geosciences Union Meeting 2022 (Makuhari Messe and Online), MIS04 P03
    • Related Report
      2022 Research-status Report
  • [Presentation] Study on the relationship between chemical weathering indices and clay-silt rates of the slope soil layers in granitic bedrock areas2022

    • Author(s)
      Oguchi, C. T., Nakamura, K., Wakatsuki, T.
    • Organizer
      Japan Geosciences Union Meeting 2022 (Makuhari Messe and Online), HGM02-05.
    • Related Report
      2022 Research-status Report
  • [Presentation] Evaluation of temperature dependance for adsorption of heavy metals onto soils and sediments2022

    • Author(s)
      Kurita, K., Saito T., Oguchi, C. T., Kawabe, Y.
    • Organizer
      Japan Geosciences Union Meeting 2022 (Makuhari Messe and Online), AHW27-P08
    • Related Report
      2022 Research-status Report
  • [Presentation] Arsenic in pore waters contained in natural sediment at the northern part of the Kanto Plain2022

    • Author(s)
      Hachinohe, S., Sushmita, H., Ishiyama, T., Hamamoto, H., Oguchi, C. T.
    • Organizer
      Japan, Japan Geosciences Union Meeting 2022 (Makuhari Messe and Online), HGM02-P01
    • Related Report
      2022 Research-status Report
  • [Presentation] Salt weathering in the archaeological site of Yoshimi Hyaku Ana (Saitama, Japan): the petrographic and environmental background2022

    • Author(s)
      Germinario, L, Oguchi, C. T.
    • Organizer
      Japan Geosciences Union Meeting 2022 (Makuhari Messe and Online), MIS04-02
    • Related Report
      2022 Research-status Report
  • [Presentation] An attempt to identify minerals by a simple in situ field survey of secondary products of weathering2022

    • Author(s)
      Kamoshida, T., Oguchi, C. T.
    • Organizer
      Japan Geosciences Union Meeting 2022 (Makuhari Messe and Online), MIS04-06
    • Related Report
      2022 Research-status Report
  • [Presentation] Experimental study countermeasure against slaking of silane-based repellents by five types of tuff specimens2022

    • Author(s)
      Kudo, Y., Ikeda, Y., Oguchi, C. T.
    • Organizer
      Japan Geosciences Union Meeting 2022 (Makuhari Messe and Online), MIS04-P05
    • Related Report
      2022 Research-status Report
  • [Presentation] Influence of rock pore structure on the protective coating against weathering, Influence of rock pore structure on the protective coating against weathering2022

    • Author(s)
      Oguchi, C. T., Ikeda, Y.
    • Organizer
      European Geosciences Union 2018. Vienna, Austria, 8-13 April 2022. (発表日, 2022. 4. 11.
    • Related Report
      2022 Research-status Report
  • [Presentation] Study on the relationship between chemical weathering indices and clay-silt rates of the slope soil layers in granitic bedrock areas2022

    • Author(s)
      Chiaki T. OGUCHI, Konomi NAKAMURA and Tsuyoshi WAKATSUKI
    • Organizer
      JpGU2022 (Japan Geosciences Union 2022 Meeting)
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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