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Mechanics of hyperconcentrated sediment laden flow

Research Project

Project/Area Number 06650562
Research Category

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

Allocation TypeSingle-year Grants
Research Field 水工水理学
Research InstitutionRITSUMEIKAN UNIVERSITY

Principal Investigator

EGASHIRA Shinji  Ritsumeikan Univ., Faculty of Sci.and Eng., Prof., 理工学部, 教授 (00027286)

Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1995: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1994: ¥1,400,000 (Direct Cost: ¥1,400,000)
Keywordsmulti-phase flow / debris flow / mud flow / sediment laden flow / constitutive equations / 固液混相流 / 浮遊砂粒 / 構成則・抵抗則 / 土石流・泥流 / 粒子間応力 / レイノルズ応力
Research Abstract

Discussions are made on the effect of particle size on the flow structure of sand particle-water mixture in order to investigate the mechanics of debris/mud flows and general sediment laden flows. The experimental results show that a quasi-laminar region is formed on the movable bed even in the flow of fine sediment-water mixture and its depth increases with the increase of sediment concentration as well as of particle size. Generally, the equilibrium bed slope can be predicted in terms of particle to particle friction angle and sediment concentration in the case that sediment particles behave as a laminar motion, which is common in debris flows composed of coarse sediment. But, it is rearized tha the bed slope becomes smaller than that of debris flows. A two-layr model which constitutes the upper and lower layrs is proposed to deseribe such phenomena. The shear stress in the upper layr is governed by turbulent motions. and in the lower layr by the constitutive relations developed by Egashira, etal.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] 伊藤隆郭: "土石流の構成則とその通用性に関する研究" 土木学会第51回年次学術講演会. 第2部(A)(発表予定). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 江頭進治: "固定床開水路における砂礫の輸送形態と輸送能力" 水工学論文集,土木学会. 40. 971-976 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 芦田和男: "固液混相流における支配方程式とその適用性" 水工学論文集,土木学会. 39. 537-549 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 江頭進治: "砂粒子と高濃度に含む流れに及ぼす粒子径の影響" 京大防災研究所年報,. 37B-2. 359-369 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 芦田和男: "固液混相流における支配方程式の構造について" 水工学論文集,土木学会. 38. 563-570 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ito, T.and S.Egashira: "Constitutive equations of debris flows and their applications" Proc.Annual Meeting of JSCE. No.2 (A) (in printing).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Egashira, S., Yoshizumi, M.and T.Ito: "Sediment movement modes and transport capacity in open channel with rigid bed" Annual Journal of Hydraulic Eng., JSCE. Vol.40. (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ashida, K., Egashira, S., etal: "Governing equations of solid-liquid two phase flow and their application" Annual Journal of Hydraulic Eng., JSCE. VoL.39. (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Egashira, S., Sato.and K.Chishiro: "Effect of particle size on the flow structure of sand-water mixture" Annuals, DPRI,Kyoto Univ.Vol.37B-2. (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ashida, K., Egashira, S., etal: "Governing equations for the flows of liquid-solid mixture" Annual Journal of Hydraulic Eng., JSCE. Vol.38. (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 芦田和男 他: "固液混相流における支配方程式の構造について" 水工学論文集、土木学会. 38巻. 563-570 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] 江頭進治 他: "砂粒子を高濃度に含む流れに及ぼす影響" 京都大学防災研究所年報. 37号B-2. 359-369 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] 芦田和男 他: "固液混相流における支配方程式とその適用性" 水工学論文集、土木学会. 39巻. 537-548 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 江頭進治: "砂粒子を高濃度に含む流れに及ぼす粒子径の影響" 京都大学防災研究所年報. 37号B-2. 359-369 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 芦田和男: "固液混相流における支配方程式とその適用性" 水工学論文集. 39. 537-550 (1995)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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