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STUDY ON UNSTEADY RESPONSE CHARACTERISTICS OF FLOW AROUND HYDRAULIC STRUCTURES ENVIRONMENTALLY CONSIDERED

Research Project

Project/Area Number 07650597
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

TOMINAGA Akihiro  Nagoya Institute of Technology, 工学部, 助教授 (60135530)

Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1996: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1995: ¥1,200,000 (Direct Cost: ¥1,200,000)
Keywordsunsteady flow / compound channel / vegetated flow / 2-d numerical calculation / large scale vortex / spur dike / flood routing / hydraulic structure / 洪水流 / 横断方向せん断流れ
Research Abstract

The purpose of this study is to clarify the response characteristics of the flow around the vegetation on the flood plains under changing discharge and to investigate the middle-scale unsteady flow structures around the vegetation and the spur dikes. The study on vegetated two-stage flow was conducted experimentally by using unsteady water supply system and numerically by using 2-D depth averaged mathematical model. Next, unsteady turbulent flow structures around the spur dikes and vegetated zone were investigated.
Some noticeable differences between unsteady flow structures with and without vegetation were revealed. The vegetation in the flood plains increases the unsteadiness of the main-channel velocity by the effects of vegetation arrangement. The shortly vegetated zone in the flood plains causes a sharp decrease of the flow depth in front of that and increases an upstream stage extremely. 2-D depth-averaged numerical calculation technique for unsteady flow with vegetation in flood … More plains was developed. The calculated results reproduce well the characteristic tendency of the experiments. This calculation method is useful for the flood routing passing such a complex flow field.
The nature of flow and vortex structure around the spur dikes with various permeability were investigated. When spur dike is non-permeable, a strong circulation is generated behind the spur dike, but it diminishes in the movable-bed condition, because of massive scour and deposition. The permeable spur dike with refracted flow has mild effects for resistance and scouring but can make broad circulation zone behind it. The flow and vortex structures are studied experimentally in compound open channel flows with loosely and densely wooded zone on flood plains. The large-scale periodic vortex motion was observed in these vegetated flows and it could be regenerated by using the unsteady depth-averaged 2-D simulation.
We believe that the results of this study give useful knowledge for hydraulic engineering. Less

Report

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

    (28 results)

All Other

All Publications (28 results)

  • [Publications] 冨永晃宏・長尾正志: "高水敷樹木群の洪水流に及ぼす水理的影響" 河道の水理と河川環境シンポジウム論文集. 2. 67-72 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Tominaga,A. 他2名: "Hydraulic characteristics of Unsteasy Flow in open Channels with Flood Plains" Proc. of 26th IAHR Congress, London. Vol.1. 373-378 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 冨永晃宏 他3名: "高水敷樹木群を有する複断面河道の非定常流の水理特性" 水工学論文集. 40. 693-698 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 冨永晃宏 他2名: "局所的樹木群を有する複断面開水路を通過する洪水波の変形過程" 水工学論文集. 41. 681-686 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 冨永晃宏 他1名: "超流型水制周辺の流れ構造" 第1回環境流体シンポジウム講演論文集. 1. 317-318 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 大沼保仁・冨永晃宏: "局所的樹木群を有する複断面流れの3次元流れ構造" 第1回環境流体シンポジウム講演論文集. 1. 399-400 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Tominaga, A., Liu, J.and Nagao, M.: "Hydraulic characteristics of unsteady Flow in Open Channels with Flood Plains" Proc.of 26th IAHR Congress, London. 373-378 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Shibata, K., Tominaga, A.and Mio, N: "Unsteady Flow Characteristics in Compound Channels with Wooded Plains" Proc.of 50th Annual Meeting of JSCE. II-313. 626-627 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kurokawa, Y., Tominaga, A.and Suzuki, T.: "Hydraulic Influence of Densely Wooded Zone on Flood Plains" Proc.of 50th Annual Meeting of JSCE. II-282. 554-555 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Fujiwara, K., Tominaga, A.and Chiba, S.: "Flow Structures around a Submerged Spur Dike" Proc.of 50th Annual Meeting of JSCE. II-283. 556-557 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Tominaga, A., Shibata, K., Mio, N.and Nagao, M.: "Hydraulic Characteristics of Unsteady Flow in Compound Channels with Wooded Zones on Flood Plains" Proc.of Hydraulic Engineering, JSCE. vol.40. 693-698 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Ohnuma, Y.and Tominaga, A.: "Three Dimensional Flow Structures of Compound Channel flows with Local Wooded Zone" Proc.of 1996 Meeting of JSFM. C254. 399-400 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Tominaga, A.and Chiba, S.: "Flow Structures around a Submerged Spur Dike" Proc.of 1996 Meeting of JSFM. C113. 317-318 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Ohnuma, Y., Tominaga, A.and Nagao, M.: "Hydraulic Characteristics of Compound Open Channel Flows with Local Wooded Zone on Flood Plain" Proc.of 51th Annual Meeting of JSCE. II-179. 358-359 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Kurokawa, Y., Tominaga, A.: "Hydraulic Characteristics of Flow around Permeable Spur Dike" Proc.of 51th Annual Meeting of JSCE. II-178. 356-357 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Tominaga, A., Nagao, M.and Sho, K.: "Transformation Process of Flood Waves Passing Compound Channels with Locally Vegetated Flood Plains" Proc.of Hydraulic Engineering, JSCE. vol.41(in printing). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 冨永晃宏 他2名: "局所的樹木群を有する複断面開水路を通過する洪水波の変形過程" 水工学論文集. 41. 681-686 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 冨永晃宏 他1名: "越流型水制周辺の流れ構造" 第1回環境流体シンポジウム講演論文集. 1. 317-318 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 大沼保仁 他1名: "局所的樹木群を有する複断面流れの3次元流れ構造" 第1回環境流体シンポジウム講演論文集. 1. 399-400 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 大沼保仁 他2名: "局所的高水敷樹木群を有する複断面開水路流の水理特性" 土木学会第51回年次学術講演会講演概要集. II. 358-359 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 冨永晃宏 他2名: "スリットを有する水制の水理機能について" 土木学会中部支部平成8年度研究発表会講演概要集. 171-172 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 柴田健一郎 他2名: "高水敷高さと樹木群密生度が流れの横断混合に及ぼす影響" 土木学会中部支部平成8年度研究発表会講演概要集. 169-170 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Tominaga,A. 他2名: "Hydraulic characteristics of Unsteasy Flow in open Channels with Flood Plains" Proc. of 26th IAHR Congress, London. Vol. 1. 373-378 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 冨永晃宏 他3名: "高水敷樹木群を有する複断面河道の非定常流の水理特性" 水工学論文集. 40(発表予定). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 冨永晃宏・長尾正志: "高水敷樹木群の洪水流に及ぼす水理的影響" 河道の水理と河川環境シンポジウム論文集. 2. 67-72 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 冨永晃宏 他3名: "高水敷樹木群を有する河道の3次元乱流構造" 土木学会中部支部研究発表会講演概要集. 145-146 (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 冨永晃宏 他2名: "高水敷樹木帯を有する河道非定常特性とその数値計算" 土木学会中部支部研究発表会講演概要集. 151-152 (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 冨永晃宏 他2名: "透過水制周辺の流れ構造" 土木学会中部支部研究発表会講演概要集. 135-136 (1996)

    • Related Report
      1995 Annual Research Report

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

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