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Hydraulic characteristics in vegetated open channel flows.

Research Project

Project/Area Number 05660279
Research Category

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

Allocation TypeSingle-year Grants
Research Field Irrigation, drainage and rural engineering/Rural planning
Research InstitutionSAGA University

Principal Investigator

KATO Osamu  SAGA Univ., Facil.of Agri., Professor, 農学部, 教授 (40038295)

Co-Investigator(Kenkyū-buntansha) SEGUCHI Masahiro  SAGA Univ., Facil.of Agri., Assis.Professor, 農学部, 助教授 (20093974)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1994: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1993: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsVegetated channel / Turbulent intensity / Reynolds stress / Deflection / Velocity profile / 植生 / 流水抵抗 / 流速分布 / セン断応力分布 / 植物の変形 / 水性植物 / スペクトル解析 / 乱れ特性
Research Abstract

The objectives of this study are to investigate the effects of the sway of flexible standing roughness elements on the profiles of mean velocity, turbulence intensities and Reynolds stress, and to develop a theoretical model which can explain the experimental results.
A relationship between the deflection of reeds and water velocity was investigated in order to understand the physical characteristice of reeds, e.g.flexural rigidity.
The reeds as the roughness elements were used Hydrilla verticillata(L.f).Casp.KUROMO and Potamogeton oxyphyllus Miquel, YANAGIMO.The experiments were conducted in a recirculating open channel 7.0m long, 0.4m wide, and 0.4m deep. The roughness elements were placed in a bed 0.9m long with the same distance in a between in a square lattice. For each roughness, the experiment was divided to three cases.
In this model, the momentum equations are derived for the steady uniform flow and the displacement of roughness elements is analyzed as the static deflection problem of cantilever, in which the hydrodynamic force is converted into the external force acting on the roughness elements. The flow field may be conveniently separated into two region ; (1)the outer region, which corresponds to the region above roughness elements, (2)the inner region, which corresponds to the region within roughness elements.
The analytical velocity profile show that the theory could bu used efficiently to predict the characteristics of flow.
The hydrodynamic force acting on one roughness element is assumed to be proportional to the projected area in the flow-direction and to the square of mean velocity, and the displacement of roughness elements is derived from the bending moment at an arbitrary position.
The calculated deflection of the roughness element agree to all of the experimental profiles with exception of the case of slow velocities.

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] J.T.A.Gerung,加藤治,瀬口昌洋: "The Turbulence Effects of Aquatic Plants Located in Channel." 農業土木学会論文集. (投稿中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] J.T.A.Gerung,加藤治,瀬口昌洋: "Turbulence Structure in Real Aquatic Plants Channel Flow." 農業土木学会論文集. (投稿中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] J.A.T.Gerung, Osamu Kato and Masahiro Seguchi: "The Turbulence Effects of Aquatic Plants Located in Channel." Tras.of JSIDRE. (submit).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] J.A.T.Gerung, Osamu Kato and Masahiro Seguchi: "Turbulence Structure in Real Aquatic Plants Channel Flow." Tras.of JSIDRE. (submit).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 加藤 治,J.T.A.Gerung: "植生を伴う水路の流れについて" 平成5年度応用水理研究部会講演集. 23-30 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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