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Study on stability of organized horizontal vortices and sediment transport in compound open channel flow

Research Project

Project/Area Number 07455195
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 水工水理学
Research InstitutionTokyo Institute of Technology

Principal Investigator

IKEDA Syusuke  Faculty of Eng., Tokyo Institute of Technology, Professor, 工学部, 教授 (60016590)

Co-Investigator(Kenkyū-buntansha) IZUMI Norihiro  Faculty of Eng.Tohoku Univ.Associate professor, 工学部, 助教授 (10260530)
YAGI Hiroshi  Faculty of Eng., Tokyo Institute of Technology, Associate professor, 工学部, 助教授 (80201820)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥5,700,000 (Direct Cost: ¥5,700,000)
Fiscal Year 1996: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1995: ¥3,900,000 (Direct Cost: ¥3,900,000)
KeywordsCompound open channel flow / Horizontal organized vortices / Vortex streets / Shear instability / Reynolds stress / 複断面水路 / 水平渦 / 変曲点不安定 / カルマン渦列 / 2列渦列の干渉 / 物質輸送 / SDS / PIV
Research Abstract

It has been known that shear instability generates large horizontal vortices at the junctions of main channel and flood plains in two-stage channel. A series of laboratory tests were performed by varying the main channel width, and the tests were conducted for 3 cases of water depth. Fluid velocity and water surface elevation were measured by using laser-Doppler velocimetry and capacity-type wave gage, respectively. It was found that two arrays of vortex streets become very stable at b/H=5, in which b is main channel width and H is main channel depth. The Reynolds stress at the junction shows a peak value at b/H=5 for all cases of water depth. The wavelength of vortices was predicted successfully in terms of linear instability analysis.
A series of laboratory tests were also performed in open channel flows with bank vegetation, in which the flow fields become more 2-dimensional than compound open channel flow. Similarly in compound open channel flow, when the vortex streets becomes stable staggered array, the Reynolds stress takes a peak value. The peak value of Reynolds stress is larger than that of compound open channel flow. A numerical computation employing SDS and 2DH turbulence model originally proposed by Nadaoka and Yagi was performed to calculate the 2-dimanesional flow field, supporting the measurements.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 池田駿介: "両岸に植生帯を有する開水路流れに発生する大規模水平渦の安定性と運動量輸送" 土木学会論文集. 551・II-37. 63-73 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 池田駿介: "複断面水路流れに発生する大規模水平組織渦の安定性に関する実験的研究" 水工学論文集. 40. 705-710 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 池田駿介: "瀬の水理特性に関する現地観測" 水工学論文集. 40. 901-906 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 池田駿介: "直線複断面開水路流れに発生する大規模水平渦列の安定性と運動量輸送に関する実験的研究" 土木学会論文集. 558・II-38. 91-102 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Syusuke IKEDA: "Stability of organized horizontal vortices and momentum transport in open channel flows with bank vegetation" Journal of Hydraulic, Coastal and Environmental Engineering (JSCE). No.551, II-37. 63-73 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Syusuke IKEDA: "Experimental study on stability of large horizontal organized vortices in compound open channel flows" Annual Journal of Hydraulic Engineering (JSCE). No.40. 705-710 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Syusuke IKEDA: "Study on hydraulic characteristics of a riffle by field observation" Annual Journal of Hydraulic Engineering (JSCE). No.40. 901-906 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Syusuke IKEDA: "Laboratory study on large horizontal vortices in compound open channel flow" Journal of Hydraulic, Coastal and Environmental Engineering (JSCE). No.558, II-38. 91-102 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 池田駿介: "両岸に植生帯を有する開水路流れに発生する大規模水平渦の安定性と運動量輸送" 土木学会論文集. 551・I-37. 63-73 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 池田駿介: "複断面開水路流れに発生する大規模水平組織渦の安定性に関する実験的研究" 水工学論文集. 40. 705-710 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 池田駿介: "瀬の水理特性に関する現地観測" 水工学論文集. 40. 901-906 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 池田駿介: "複断面開水路流に発生する大規模水平渦の構造" 第27回乱流シンポジウム講演論文集. 27. 101-104 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 池田駿介: "不規則応答解析による穂波に関する研究" 第27回乱流シンポジウム講演論文集. 27. 291-294 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 池田駿介: "複断面開水路水平渦の安定性とその3次元構造" 土木学会論文集. 509/II-30. 131-142 (1995)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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