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Study on the mechanism and prediction of debris slides

Research Project

Project/Area Number 62480060
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 林学
Research InstitutionTokyo University of Agriculture and Technology

Principal Investigator

TSUKAMOTO Yoshinori  Tokyo University of Agriculture and Technology, 農学部, 教授 (60014924)

Co-Investigator(Kenkyū-buntansha) NOGUCHI Haruhiko  Tokyo University of Agriculture and Technology, 農学部, 助手 (90014951)
MINEMATSU Hirohiko  Tokyo University of Agriculture and Technology, 農学部, 助教授 (60011988)
OHTA Takehiko  Tokyo University of Agriculture and Technology, 農学部, 助教授 (50134797)
新井 雅夫  東京農工大学, 農学部, 助教授 (90014927)
大里 正一  東京農工大学, 農学部, 教授 (30011935)
Project Period (FY) 1987 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 1988: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1987: ¥4,000,000 (Direct Cost: ¥4,000,000)
KeywordsDebris slide / Mechanism and prediction / Soil depth / Saturated lateral flow / Hydraulic conductivity and pipe / Multi-variation-analysis / 根系の崩壊抑止効果 / 発生機構 / 表土層厚 / 数量化法 / 平均化 / 崩壊予測 / 発生予知 / 下層土 / 最大土層厚
Research Abstract

The result of research consists of the following four parts. The characteristics of debris slides: Debris slides occur in O order basins on slopes where mountain reliefs are small and bed rocks are subject to weathering or lowly consolidated. The characteristic of slope profiles vulnerable to debris slides is clarified by using the vertical variation of hydraulic conductivity, shear strength, N values and hardness of soil and reinforcement of soil by roots. Soil lapths and saturated alteral flow: Surface soil depths as a potential soil layer of debris slides were measured on three slopes, paleozoic, granite and tertiary. The results are expressed in terms of slope gradients. The process of topographical development of a O order basin is investigated with the change of curvetures of contour lines. The infiltrating process of storm water was measured on a slope with tensiometers and piezometers. Analysis was conducted with hydraulic headmaps, reconstructing subsurface flow patterns on a typical Pliocene zero order basin. Pipes in soil are classified into two catgories: visible and invisible. In addition, the role of pipes for stormflow in soil is discussed. The variation of saturated hydraulic conductivity of surface soil becomes smaller as the size of a sammpling cylinder become larger. The best size for practical use is 15-20 cm in diameter.
Analysis of factors affecting landslide occurrence: Fifty seven results of multivariation analysis of landslides in a heavy storm in various regions were collected and analysed. The analysis showed the importance of altitude which is closely related to various other factors. A dividing line is set at 900 m, above which altitude is most important and below which vegetation become most important. Effect of tree roots on slope stability: An infinite slope model andan upper bound model were applied to estimate the reinforcement of soil strength by tree roots. The result is discussed from various viewpoints.

Report

(3 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] Yoshinori Tsukamoto: IAHS(International association of hydrological sciences). 165. 61-75 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Yoshinori Tsukamoto: IAHS(International association of hydrological sciences). 167. 181-189 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Yoshinori Tsukamoto: Journal of Hydrology. 102. 165-178 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Yoshinori Tsukamoto: 地形(Trans.Japan Geomorph.Union).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Yoshinori Tsukamoto: Proceedings of tge 4th Intern.Sympo.River sedimentation in Bejiog,China.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 太田猛彦: 水文・水資源学会誌. 1(1). 75-82 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Yoshinori Tsukamoto: "Hydrogeomorphological characteristics of a zero order basin." IAHS(International Association of Hydrological Sciences). 165. 61-75 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Yoshinori Tsukamoto: "Evaluation of the effect of deforestation on slope stability and its application to watershed management." IAHS. 167. 181-189 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Yoshinori Tsukamoto: "Runoff process on a steep forested slope." Journal of Hydrology. 102. 165-178 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Yoshinori Tsukamoto: "Application of geomorphology to sediment disaster prediction and control research." Trans. Japan Geomorphological Union. in press.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Yoshinori Tsukamoto: "Debris slides and hillslope process in low relief watersheds in Japan" Proceedings of 4th Intern. Sympo. River Sedimentation, Bejing, China.in press.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Yoshinori,Tsukamoto: Journal of Hydrology. 102. 165-178 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Yoshinori,Tsukamoto: 地形(Trans.Jpn.Geomorph.Unionn). in press.

    • Related Report
      1988 Annual Research Report
  • [Publications] Yoshinori,Tsukamoto: Proceeedings of 4th Intern.Sympo.River Sedimentation,Bejing,China.in press.

    • Related Report
      1988 Annual Research Report
  • [Publications] 塚本良則: 波丘地研究. 6. 268-280 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 太田猛彦: 日本林学会誌. 70(8). 367-370 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 太田猛彦: 水文・水資源学会誌. 1(1). 75-82 (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] Tsukamoto,Y.: Proceedings of international Symposium on Erosion and Sedimeutation of Pacific Rim,Corvallis,Oregon.IAHS Publ-No.165. 61-70 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] Tsukamoto,Y.: Proceedings of international symposium of forest hydrology and watershed managemeut,Vancover,Canada. IAHS Publ-No.167. 181-189

    • Related Report
      1987 Annual Research Report
  • [Publications] 塚本良則: 波丘地研究. 6.

    • Related Report
      1987 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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