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The Study for Spatial Structures and Time Development of Turbulence in the Atmospheric Boundary Layer

Research Project

Project/Area Number 13640437
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionKyoto University

Principal Investigator

HORIGUCHI Mitsuaki  Kyoto University, Disaster Prevention research Institute, Research Associate, 防災研究所, 助手 (60190253)

Co-Investigator(Kenkyū-buntansha) ISHIKAWA Hirohiko  Kyoto University, Disaster Prevention research Institute, Associate Professor, 防災研究所, 助教授 (60263159)
HAYASHI Taiichi  Kyoto University, Disaster Prevention research Institute, Associate Professor, 防災研究所, 助教授 (10111981)
UEDA Hiromasa  Kyoto University, Disaster Prevention research Institute, Professor, 防災研究所, 教授 (70026186)
ITO Yoshiki  Kaijo Corporation, Technical Strategy Room, Section head, 技術戦略室, 室長
HASHIGUCHI Hiroyuki  Kyoto University, Radio Science Center for Space and Atmosphere, Associate Professor, 宙空電波科学研究センター, 助教授 (90293943)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2002: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2001: ¥2,200,000 (Direct Cost: ¥2,200,000)
Keywordsatmospheric boundary layer / turbulence / coherent structure / large eddy simulation / wavelet transform / momentum flux / ラージエディシミュレーション / large-eddy simulation / ドップラーソーダ / 境界層レーダー
Research Abstract

In this study, the spatial structures and time development of turbulence was investigated using observations and numerical experiments for the neutral stability condition.
At first, observed data at Shionomisaki Wind Effect Laboratory and Shigaraki MU Observatory was analyzed. To make an averaged pattern for the area of strong wind, continuous wavelet transform in the time scale of 160 seconds was applied to the wind component in mean wind direction measured at a height of 20 meters. The structures of the downward moving high-speed area and upward moving low-speed area ahead of it are shown.
To execute numerical experiments, the ARPS (Advanced Regional Prediction System) developed by the CAPS (Center for Analysis and Prediction of Storms) at the University of Oklahoma was used for the large eddy simulation. For the initial condition, random potential temperature perturbation was induced on the horizontally homogeneous filed which has a wind profile with the log-linear wind law below the 30 meters and the Ekman spiral above it and an almost neutral potential temperature profile with uppermost inversion layer. After the integration time of 35040 sec., streaky structures elongated in mean wind direction are outstanding near the surface. Wavelet variance for the wind component in mean wind direction at a height of 7.5 meters is maximum at the spatial scale of 720 meters. Averaged pattern around the peak position for the wavelet variance shows the downward moving high-speed area from the height of about 150 meters. The area in length of 600 meters in mean wind direction and 240 meters in normal direction shows larger momentum flux than other areas below the height af 300 meters.

Report

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

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 植田洋匡: "乱流の構造および拡散機構に及ぼす密度成層の効果"日本航空宇宙学会誌. 第49巻. 293-299 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 堀口光章: "中立成層状態の大気境界層における組織的乱流構造"京都大学防災研究所年報. 第45号B. 347-355 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 堀口光章: "中立成層状態の大気境界層における組織的乱流構造(第2報)"京都大学防災研究所年報. 第46号B(印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ueda, H.: "Effects of density stratification on turbulence structure and turbulent transport mechanisms"Journal of the Japan Society for Aeronautical and Space Sciences. Vol.49. 293-299 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Horiguchi, M.: "Coherent turbulent structures in the planetary boundary layer during neutral stability conditions"Annuals of Disas. Prev. Res. Inst. , Kyoto Univ.. No.45 B. 347-355 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Horiguchi, M.: "Coherent turbulent structures in the planetary boundary layer during neutral stability conditions II"Annuals of Disas. Prev. Res. Inst. , Kyoto Univ.. No.46 B (in press). (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 堀口光章: "中立成層状態の大気境界層における組織的乱流構造"京都大学防災研究所年報. 第45号B. 347-355 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 堀口光章: "中立成層状態の大気境界層における組織的乱流構造(第2報)"京都大学防災研究所年報. 第46号B. (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 植田洋匡: "乱流の構造および拡散機構に及ぼす密度成層の効果"日本航空宇宙学会誌. 第49巻・第575号. 293-299 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 堀口光章: "中立成層状態の大気境界層における組織的乱流構造"京都大学防災研究所年報. 第45号B-1(発表予定). (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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