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Hydrological and geomorphic study on immunity of hillside slope against slope failure

Research Project

Project/Area Number 14560121
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 林学
Research InstitutionShinshu University (2004)
Kochi University (2002-2003)

Principal Investigator

HIRAMATSU Shinya  Shinshu University, Faculty of agriculture, Professor, 農学部, 教授 (70294824)

Co-Investigator(Kenkyū-buntansha) ISHIKAWA Yoshiharu  Tokyo University of Agriculture and Technology, Faculty of agriculture, Professor, 農学部, 教授 (70285245)
USHIYAMA Motoyuki  Tohoku University, Disaster Control Research Center, Lecturer, 災害制御研究センター, 講師 (80324705)
Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2004: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2003: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2002: ¥1,800,000 (Direct Cost: ¥1,800,000)
Keywordshillside landslides / immunity / potential of sediment yields / hydrological observation / deforestation / 免疫性 / 人工降雨実験 / マトリックス流 / 降雨分布
Research Abstract

In Japan, hillside landslides occur frequently in rainy seasons and give the great damage to human life and public property. Hillside landslides are triggered mainly by rainfall. This study was carried out to clarify causes of differences and variations of possibility of sediment yield. Cohesion and bulk density of forest soil got exponentially small and porosity of forest soil got large, in proportion to years after a weathering. In order to understand effects of forest roots (living-root and decayed-root) on hydrologic processes, that is, water movement in soil layer, field sprinkling experiments were carried out on a hill slope in the non-rainy area. The following matters were confirmed by these field experiments. Rainwater concentrates on the surroundings of forest roots. And, runoff from surrounding of forest roots in steady state increases approximately with rainfall intensity and follows Manning's low. On the other hand, runoff inside porosity of soil follows Darcy's low.
Furthermore, Evaluation model of dangerous condition to hillside landslides considering both of glowing of thickness of soil layer and possibility of rainfall was made. And this model was applied to small slope in the rainy area and non-rainy area. As the result of numerical simulation, slope stability decrease, in proportion to amount of rainfall and years after a weathering in both area. The critical amount of rainfall in rainy area was large 300mm/day from that in non-rainy area. On the other hand, the index of slope stability in rainy area was almost the same as that in non-rainy area. As a result of this numerical simulation, it was clarified that the immunity against slope failure in rainy area was larger than that in non-rainy area.

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (15 results)

All 2005 2004 2003 Other

All Journal Article (13 results) Publications (2 results)

  • [Journal Article] 崩壊の発生しやすさに関する多雨地域と非多雨地域での比較2005

    • Author(s)
      平松晋也, 河本亜矢子
    • Journal Title

      平成17年度砂防学会研究発表会概要集

      Pages: 164-165

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] 樹木根系が斜面土層内での雨水の挙動に及ぼす影響2005

    • Author(s)
      平松晋也, 宮前崇, 岩男忠明, 前川美紀子
    • Journal Title

      平成17年度砂防学会研究発表会概要集

      Pages: 88-89

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Comparison with rainy area and non-rainy area regarding possibility of slope failure2005

    • Author(s)
      Ayako KAWAMOTO, Shinya Hiramatsu
    • Journal Title

      Volume summary of research exhibition, the Japan society of Erosion Control Engineering

      Pages: 164-165

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Influence of forest roots on infiltration and runoff of rain water in forest soil2005

    • Author(s)
      Shinya Hiramatsu, Takashi MIYAMAE, Tadaaki IWAO, Mikiko MAEKAWA
    • Journal Title

      Volume summary of research exhibition, the Japan society of Erosion Control Engineering

      Pages: 88-89

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 斜面土層内の水分移動に及ぼす樹木根系の影響2004

    • Author(s)
      宮前 崇, 平松晋也
    • Journal Title

      平成16年度砂防学会研究発表会概要集

      Pages: 230-231

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 森林伐採や植栽を指標とした崩壊面積予測手法に関する研究2004

    • Author(s)
      黒岩知恵, 平松晋也
    • Journal Title

      砂防学会誌 57(2)

      Pages: 16-26

    • NAID

      10013357251

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Influence of forest roots on hydrologic processes in forest soil2004

    • Author(s)
      Takashi MIYAMAE, Shinya Hiramatsu
    • Journal Title

      Volume summary of research exhibition, the Japan society of Erosion Control Engineering

      Pages: 230-231

    • NAID

      10010410964

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Study on predicting method for area with collapsing possibility considering deforestation and reforestation2004

    • Author(s)
      Chie KUROIWA, Shinya Hiramatsu
    • Journal Title

      Journal of the Japan society of Erosion Control Engineering 57(2)

      Pages: 16-26

    • NAID

      10013357251

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 森林伐採や植栽を指標とした崩壊面積予測手法に関する研究2004

    • Author(s)
      黒岩知恵, 平松晋也
    • Journal Title

      砂防学会誌 57・2

      Pages: 16-26

    • NAID

      10013357251

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 樹木根系周辺部における雨水の挙動に関する一考察2003

    • Author(s)
      宮前 崇, 平松晋也
    • Journal Title

      平成15年度砂防学会研究発表会概要集

      Pages: 28-29

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] AMeDASデータによる暖候期降水量と最大1時間・日降水量の関係2003

    • Author(s)
      牛山素行, 寳 馨
    • Journal Title

      水文・水資源学会誌 16(4)

      Pages: 368-374

    • NAID

      10011200374

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Study on hydrologic processes around tree roots in forest soil2003

    • Author(s)
      Takashi MIYAMAE, Shinya Hiramatsu
    • Journal Title

      Volume summary of research exhibition, the Japan society of Erosion Control Engineering

      Pages: 28-29

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Relationship between warm season precipitation and highest hourly and daily precipitation based on AMeDAS data2003

    • Author(s)
      Kaoru TAKARA, Motoyuki USHIYAMA
    • Journal Title

      J.Japan Soc.Hydrol.&Water Resour. 16(4)

      Pages: 368-374

    • NAID

      10011200374

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] 宮前 崇, 平松晋也: "斜面土層内の水分移動に及ぼす樹木根系の影響"平成16年度砂防学会研究発表会概要集. (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 宮前 崇, 平松晋也: "樹木根系周辺部における雨水の挙動に関する一考察"平成15年度砂防学会研究発表会概要集. (2003)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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