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Air-water interfacial coherent structures in wind-induced open-channel flows and its effect on gas transfer

Research Project

Project/Area Number 12450200
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 水工水理学
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

NEZU Iehisa  Dept. of Global Environment Eng., Professor, 工学研究科, 教授 (30109029)

Co-Investigator(Kenkyū-buntansha) ONITSUKA Kouki  Dept. of Global Envir. Eng., Research Associate, 工学研究科, 助手 (20293904)
USHIJIMA Satoru  Dept. of Global Envir. Eng., Assoc. Professor, 工学研究科, 助教授 (70324655)
TOMINAGA Akihiro  Dept. of Civil Eng, Nagaya Inst. Tech, Professor, 工学部, 教授 (60135530)
KADOTA Akihiro  Dept. of Civil Eng., Ehime Univ., Research Associate, 工学部, 助手 (80294784)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥9,800,000 (Direct Cost: ¥9,800,000)
Fiscal Year 2002: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2001: ¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2000: ¥5,300,000 (Direct Cost: ¥5,300,000)
KeywordsOpen-Channel Turbulence / Interfacial Coherent Structure / Wind-Induced Flows / Bursting Phenomena / PIV Measurements / Air-Water Interface / Gas Transfer / LDA Measurements / 気体輸送係数 / 閉鎖性水域 / 風波 / バースト現象
Research Abstract

As for the scalar transport phenomena of the issued gases such as CO_2, O_2 and NO_x across an air-water interface, it is essential to clarify the turbulent features in the free-surface region of water flows. Previous studies of wind-induced water-wave flows have been conduced in the coastal engineering and marine sciences. It is especially important to clarify gas exchange mechanism across the air and water. In previous studies, the conditional time-space correlation analysis and the u-v quadrant method have been intensively conducted to investigate coherent structures in sheared flows such as open-channel flows and non-wavy air sheared flows.
The present investigation describes an experimental study on turbulent bursting phenomena across air-water interface in wind-induced water waves by using Particle-Image Velocimetry (PIV) in the water layer. The purpose of this study is to clarify coherent structures near the air-water interface in a wind-driven shear layer, and to evaluate an effect on momentum transport due to the busting events from the interfacial water to water-body flow. As the results of experiments, it is shown that the water flow is a combined flow with a wall shear flow and orbital motions, and that the wave-induced fluctuations have major power in the whole velocity fluctuations. In particular, when the bursting events are detected near the air-water interface by human eyes in the time-series of PIV raw images, only the low-frequency fluctuations are enhanced obviously at that time in wavelet-filter analysis. Therefore, it is inferred that the mechanism of water momentum transport is organized by the wave-induced fluctuations from the air-water interface to the water bulk, not by the bursting events with small fluctuations. It is also recognized by PIV measurements that the busting events are closely related to the unsteady wave-induced velocity fluctuations near the interface.

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (31 results)

All Other

All Publications (31 results)

  • [Publications] 禰津 家久: "砕波を伴う風波の界面乱流構造に関する研究"土木学会論文集. No684/II-56. 69-80 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 禰津 家久: "水・空気層の同時計測による風波界面近傍流体の相関構造に関する研究"水工学論文集. 第46巻. 547-552 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nezu, Iehisa: "Open-channel turbulence and its research prospect in the new century"Advances in Hydraulics and Water Engineering, World Scientific. Vol.1. 3-25 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nezu, Iehisa: "Experimental study on interfacial turbulent structures in wind-induced water waves by synchronous LDA measurements"Advances in Hydraulics and Water Engineering, World Scientific. Vol.1. 38-43 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nezu, Iehisa: "Turbulence visualization of multi-scale water velocity fluctuations of wind-driven water waves in air-water two-phase flows"10^<th> Int. Symp. on Flow Visualization(ISFV10). (CD-Rom). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 禰津 家久: "PIV法を用いた風波界面近傍流体の組織構造に関する基礎的研究"水工学論文集. 第47巻. 457-462 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nezu, I. and Onitsuka, K.: "Turbulent structures in partly vegetated open-channel flows with LDA and PIV measurements"Journal of Hydraulic Research. Vol.39, No.6. 629-642 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nezu, I., Ushijima, S., Onitsuka, K. and Yoshida, K.: "PIV measurements of turbulent structures across air-water interface in wind-driven water waves"6th Asian Symp. On Visualization, Pusan, Korea. full paper on CD-ROM. 363-365 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nezu, I., Ushijima, S., Onitsuka, K. and Yoshida, K.: "Study on turbulent structures of air-induced water waves by using phase-averaged PIV measurements"3rd Int. Symp. on Measurement Techniques for Multiphase Flows, Fukui. 211-220 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nezu, I., (ed. J. J. Guo): "Open-channel turbulence and its research prospect in the new century, in Advances in Hydraulics and Water Engineering, Vol. 1"World Scientific. 3-25 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nezu, I., Ushijima, S. and Yoshida, K., (ed. J. J. Guo): "Experimental study on interfacial turbulent structures in wind-induced water waves by synchronous LDA measurements, in Advances in Hydraulics and Water Engineering, Vol. 1"World Scientific. 38-43 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nezu, I., Yoshida, K. and Ushijima, S.: "Turbulence visualization of multi-scale water velocity fluctuations of wind-driven water waves in air-water two-phase flows, in 10^<th> Int. Symp. On Flow Visualization (IAFV1O), Book of Abstracts, Kyoto"full paper on CD-ROM. 277 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 禰津家久: "水・空気層の同時計測による風波界面近傍流体の相関構造に関する研究"水工学論文集. 第46巻. 547-552 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 禰津家久: "強い非定常性を受ける開水路乱流の平均流特性"土木学会論文集. No.705/II-59. 45-54 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Nezu, Iehisa: "Open-channel turbulence and its research prospect in the new century"Advances in Hydraulics and Water Engineering(ed. J.J.Guo), World Scientific. Vol.1. 3-25 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Nezu, Iehisa: "Experimental study on interfacial turbulent structures in wind-induced water waves by synchronous LDA measurements"Advances in Hydraulics and Water Engineering(ed. J.J.Guo), World Scientific. Vol.1. 38-43 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Nezu, Iehisa: "Turbulence visualization of multi-scale water velocity fluctuations of wind-driven water waves in air-water two-phase flows"10^<th> Int. Symp. on Flow Visualization(IAFV10), Book of Abstracts. (full paper in CD-ROM). 277 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 禰津家久: "PIV法を用いた風波界面近傍流体の組織構造に関する基礎的研究"水工学論文集. 第47巻. 457-462 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 禰津家久: "閉鎖性水域の風波発生下での乱れ構造及びバーストの周期について"水工学論文集. 第45巻. 529-534 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 禰津家久: "逆圧力勾配を有する開水路乱流のバースティング現象"土木学会論文集. No.677/II-55. 43-51 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 禰津家久: "砕波を伴う風波の界面乱流構造に関する研究"土木学会論文集. No.684/II-56. 69-80 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Nezu, Iehisa: "PIV measurements of turbulent structures across air-water interface in wind-driven water waves"6th Asian Symp. on Visualization, Pusan, Korea. (概要),(full paper in CD-ROM). 363-365 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Nezu, Iehisa: "Study on turbulent structures of air-induced water waves by using phase-averaged PIV measurements"3rd Int. Symp. on Measurement Techniques for Multiphase Flows, Fukui. 211-220 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 禰津家久: "閉鎖性風波水域における空気・水界面領域の乱流構造に関する実験的研究"応用力学論文集. Vol.4. 629-638 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 禰津家久: "かぶり水深の変化が複断面開水路流れの組織渦に及ぼす影響に関する研究"土木学会論文集. No.649. 1-15 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Nezu,Iehisa: "Experimental study on turbulent structure in open-channel flows with adverse pressure gradients"4^<th>Intern.Conference on Hydrodynamics. Vol.2. 851-856 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 禰津家久: "PIV法による砕波を伴う風波の界面乱流構造に関する研究,"応用力学論文集,. Vol.3. 775-785 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 禰津家久: "わんど形状が河川に及ぼす影響に関する水理学的研究,"応用力学論文集,. Vol.3. 813-820 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 禰津家久: "閉鎖性水域の風波発生下での乱れ構造及びバーストの周期について,"水工学論文集. 第45巻. 529-534 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 禰津家久: "非定常性がKarman定数に及ぼす影響,"水工学論文集,. 第45巻. 625-630 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 禰津家久: "水理学"朝倉書店. 319 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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