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Unification of theories for the debris flow mechanics

Research Project

Project/Area Number 04650458
Research Category

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

Allocation TypeSingle-year Grants
Research Field Hydraulic engineering
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

TAKAHASHI Tamotsu  Kyoto University, Diasater Prevention Research Institute, Professor, 防災研究所, 教授 (40027230)

Co-Investigator(Kenkyū-buntansha) NAKAGAWA Hajime  Kyoto University, Disaster Prevention Research Institute, Associate Professor, 防災研究所, 助教授 (80144393)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1993: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1992: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsDebris flow / Stony debris flow / Viscous debris flow / Flow model / Constitutive equation / Solids concentration / Unification / 粘性型土石流 / 流動則 / 石礫含有率 / 間隙流体 / カオリン
Research Abstract

The constitutive equations for the viscous debris flow were given under the hypothesis that the squeezed flow arising from the shearing between the two adjacent layrs of particles in the viscous fluid produces the particle sustaining dispersive pressure as well as the shear stress. Those equations were applied to the flume experiments in the laboratory and the characteristics of flow such as the equilibrium solids concentration, the specific viscosity and velocity distributions were deduced. The particle concentration in an equilibrium viscous flow composed of nearly uniform materials, in which the particles are transported without deposition, is not much different from that of the inertial flow on the same bed slope. This fact brings a kind of paradox that if the material is the well graded mixture, as observed in the actual viscous debris flow, the flow can transport much more dense solids concentration. A hierarchic buoyancy increment effect was suggested for a possibe cause of high competence to transport particles. The viscosity of the highly freighted viscous debris flow becomes very large in comparison to that of the interstitial slurry. The specific viscosity defined as the ratio of that of the entire debris flow material to that of the slurry increases with increase in the concentration of the coarse particles, but the tendency of the change versus concentration seems different depending on the viscosity of the slurry. Such results of investigation were combined with the theory for stony debris flow and an approach to make a unified comprehensive theory of the mechanics of debris flow was proposed.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] Takahashi,T.: "Dynamics of Inertial and Viscous Debris Flows" Proc.International Workshop on Debris Flow. 43-55 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 高橋保・小林幸一郎: "粘性土石流の流動機構に関する研究" 京都大学防災研究所年報. 36B-2. 433-449 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Takahashi,T.: "Fluid Mechanical Modelling of the Viscous Debris Flow" Proc.“Pierre Beghin"International Workshop on Rapid Gravitational Mass Movement. 1-6 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 高橋 保: "土石流・泥流の流動機構" 土砂移動現象に関するシンポジウム論文集. 39-55 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Takahashi, T.: "Dynamics of inertial and viscous debris flow" Proc.International Workshop on Debris Flow. 43-55 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Takahashi, T.: "Mechanics of the viscous type debris flow" Annuals, Disaster Prevention Research Institute, Kyoto Univ.NO.36 B-2. 433-449 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Takahashi, T.: "Fluid mechanical modeling of the viscous debris flow" Proc."Pierre Beghin" International Workshop on Rapid Gravitational Mass Movement. 1-6 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Takahashi, T.: "Mechanics of flow of the debris flow and mudflow" Proc.Symposium on the Sediment Transport Phenomena. 39-55 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Takahashi,T.: "Dynamics of Inertial and Viscous Debris Flows" Proc.International Workshop on Debris Flow. 43-55 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 高橋保・小林幸一郎: "粘性土石流の流動機構に関する研究" 京都大学防災研究所年報. 36B-2. 433-449 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Takahashi,T.: "Fluid Mechanical Modelling of the Viscous Debris Flow" Proc.“Pierre Beghin"International Workshop on Rapid,Gravitational Mass Movement. 1-6 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 高橋 保: "土石流・泥流の流動機構" 土砂移動現象に関するシンポジウム論文集. 39-55 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] 高橋 保: "土石流・泥流の流動機構" 土砂移動現象に関するシンポジウム論文集. 39-55 (1992)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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