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Prediction of the hydrograph of a debris flow

Research Project

Project/Area Number 60550362
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  Professor of the Disaster Prevention Research Institute, Kyoto University, 防災研究所, 教授 (40027230)

Co-Investigator(Kenkyū-buntansha) SAWADA Toyoaki  Instructor of the Disaster Prevention Research Institute, Kyoto University, 防災研究所, 助手 (60027258)
Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1986: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1985: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsDebris flow / Mud flow / Mechanism of occurrence / Hydrograph / Bed sediment layer, Natural dam / 天然ダム / 予測
Research Abstract

This study aims to present the methods to predict the hydrographs of debris flows in an actual mountain stream.
First, a system of equations with which to predict the hydrograph of a debris flow at an arbitrary position in a channel whose bed varies in slope, width and thickness and is composed of a graded mixture of particles is presented. This system not only can be used to estimate the hydrograph of a debris flow under an arbitrary water supply but to determine the change in concentration of particles in the flow by separating them into coarse and fine components. Application of this system of equations to laboratory experiments and to the huge mud flow generated by the eruption of the Nevado del Ruiz Volcano in Colombia proved that it is a useful prediction method.
Second, the deformation of the debris flow hydrograph observed in the channel of the Shiramizudani, a branch of the Gamada River, Japan, was compared with the kinematic wave theory. The result of observation showed large attenuation of peak discharge down the channel and this was successufully explained by the theory.
Third, concerning with the debris flow genarated by the collapse of a natural dam, a series of laboratory experiments were done. The equation presenting the criterion whether a natural dam is formed in a channel was given as a relation between the slope of the channel and a function of the sediment volume and the stream discharge per unit width. There were two different processes in the failure of the natural dam in experiments and the peak discharge produced by the collapse of the dam in each case was different. The theoretical analysis of these processes should be done later.

Report

(1 results)
  • 1986 Final Research Report Summary
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 高橋保,匡尚富: 京都大学防災研究所年報 第29号B-2. 343-359 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] 芦田和男,高橋保,沢田豊明: 京都大学防災研究所年報 第29号B-2. 291-307 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Takahashi,T;Nakagawa,H and Kuang,s: Proceedings of the International Symposium on Erosion and Sedimentation in the Pacific Rim. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Takahashi Tamotsu and Kuang Sang fu: "Formation of debris flow on varied slope bed" Annuals, Disaster Prevention Research Institute, Kyoto University. 29-B2. 343-359 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Ashida Kazuo, Takahashi Tamotsu and Sawada Toyoaki: "Runoff process, sediment yield and transport in a mountain watershed (15)" Annuals, Disaster Prevention Research Institute, Kyoto University. 29-B2. 291-307 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Takahashi Tamotsu, Nakagawa Hajime and Kuang Sang fu: "Estimation of debris flow hydrograph on varied slope bed" Proceedings of the International Symposium on Erosion and Sedimentation in the Pacific Rim. (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary

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Published: 1987-03-31   Modified: 2016-04-21  

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