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Elucidation of relationship between offshore wind waves and sea surface drag coefficient through direct measurements of wind turbulence by a drifting buoy

Research Project

Project/Area Number 16K13878
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeMulti-year Fund
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionThe University of Tokyo

Principal Investigator

Komatsu Kosei  東京大学, 大学院新領域創成科学研究科, 准教授 (30371834)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2018: ¥130,000 (Direct Cost: ¥100,000、Indirect Cost: ¥30,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywords海面抵抗係数 / 海上風乱流 / 波浪 / 漂流ブイ / 渦相関法 / ブイ式観測システム / 外洋波浪
Outline of Final Research Achievements

This study aims to contribute to elucidation of the relationship between offshore wind waves and sea surface drag coefficient by developing a scheme to measure accurately wind turbulence near the sea surface in the offshore region. We constructed a drifting buoy equipped with a 3D ultra-sonic anemometer, a GPS wave height meter and a motion sensor, and developed a scheme to estimate the drag coefficient by eddy correlation method. The scheme achieved highly accurate measurements of wind velocity (RMSE is 0.1 m/s) by eliminating errors due to fluctuations of the buoy using motion data.

Academic Significance and Societal Importance of the Research Achievements

海面抵抗係数は、大気と海洋間の運動量、熱、物質の交換過程を規定する最重要パラメータであり、特に波浪との関係がこれまで多くの研究がなされてきたが、外洋域の精度の高い現場データが不足していることもあって、確定的な結論は得られていない。本研究で新たに開発したブイと推定手法により、沖合域での海面抵抗係数を正確に推定することが可能になった。この成果は、大気海洋相互作用や気候変動、さらには海洋によるCO2の吸収といった現象の実態解明に貢献する。また、数値モデルによる台風予測や波浪予測、さらには地球温暖化の影響予測の高精度化にも直結しており、防災研究と環境研究の両面でも大きな貢献が期待できる。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (22 results)

All 2019 2018 2017 2016 Other

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (11 results) (of which Int'l Joint Research: 1 results) Book (1 results) Remarks (6 results)

  • [Journal Article] Combining microvolume isotope analysis and numerical simulation to reproduce fish migration history2018

    • Author(s)
      Sakamoto Tatsuya、Komatsu Kosei、Shirai Kotaro、Higuchi Tomihiko、Ishimura Toyoho、Setou Takashi、Kamimura Yasuhiro、Watanabe Chikako、Kawabata Atsushi
    • Journal Title

      Methods in Ecology and Evolution

      Volume: 10 Issue: 1 Pages: 59-69

    • DOI

      10.1111/2041-210x.13098

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Swell-dominant surface waves observed by a moored buoy with a GPS wave sensor in Otsuchi Bay, a ria in Sanriku, Japan2017

    • Author(s)
      Komatsu K, Tanaka K
    • Journal Title

      Journal of Oceanography

      Volume: 73 Issue: 1 Pages: 87-101

    • DOI

      10.1007/s10872-016-0362-4

    • Related Report
      2016 Research-status Report
    • Peer Reviewed
  • [Journal Article] Baroclinic circulation and its high frequency variability in Otsuchi Bay on the Sanriku ria coast, Japan2017

    • Author(s)
      Tanaka,K., K. Komatsu, S. Itoh, D.Yanagimoto, M.Ishizu, H.Hasumi, T.T. Sakamoto, S. Urakawa, Y. Michida
    • Journal Title

      Journal of Oceanography

      Volume: 73 Issue: 1 Pages: 25-38

    • DOI

      10.1007/s10872-015-0338-9

    • Related Report
      2016 Research-status Report
    • Peer Reviewed
  • [Journal Article] Influence of the Oyashio Current and Tsugaru Warm Current on the circulation and water properties of Otsuchi Bay, Japan2017

    • Author(s)
      Ishizu, M, S. Itoh, K. Tanaka and K.Komatsu
    • Journal Title

      Journal of Oceanography

      Volume: 73 Issue: 1 Pages: 115-131

    • DOI

      10.1007/s10872-016-0383-z

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Swell-dominant surface waves inherent in the shape of the rias coast facing the western North Pacific2019

    • Author(s)
      Komatsu K, Tanaka K
    • Organizer
      JPGU Meeting 2019
    • Related Report
      2018 Annual Research Report
  • [Presentation] Measuring the air-sea interface using a bird-attached logger2019

    • Author(s)
      Komatsu K, Sato K, Goto Y, Yonehara Y, Sakamoto KQ, Naruoka M
    • Organizer
      SOLAS Open Science Conference
    • Related Report
      2018 Annual Research Report
  • [Presentation] Swell-dominant surface waves inherent in the coastal shape of rias bays facing the western North Pacific2018

    • Author(s)
      Komatsu K, Tanaka K
    • Organizer
      PICES 2018 Annual Meeting
    • Related Report
      2018 Annual Research Report
  • [Presentation] 黒潮域における水平拡散係数のスケール依存性Ⅱ2018

    • Author(s)
      小松幸生, 廣江豊
    • Organizer
      日本海洋学会2018年度秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Topography-dependent relation between offshore wind field and swell-dominant surface waves observed inside bays on the Sanriku ria coast of Japan2017

    • Author(s)
      Komatsu K, Tanaka K
    • Organizer
      JPGU-AGU Joint Meeting 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 黒潮域における水平拡散係数のスケール依存性2017

    • Author(s)
      小松幸生, 廣江豊
    • Organizer
      日本海洋学会2017年度秋季大会
    • Related Report
      2017 Research-status Report
  • [Presentation] バイオロギングによる波浪現場観測2016

    • Author(s)
      小松幸生
    • Organizer
      東京大学大気海洋研究所共同利用研究集会「バイオロギングと海洋・大気変動予測の未来」
    • Place of Presentation
      東京大学大気海洋研究所, 千葉県柏市
    • Related Report
      2016 Research-status Report
  • [Presentation] 黒潮域における水平拡散係数の実態について2016

    • Author(s)
      小松幸生, 廣江豊
    • Organizer
      水産海洋学会2016年度研究発表大会
    • Place of Presentation
      東京海洋大学, 東京都港区
    • Related Report
      2016 Research-status Report
  • [Presentation] 高解像度漂流ブイによる黒潮域における水平拡散係数のスケール依存性2016

    • Author(s)
      小松幸生, 廣江豊
    • Organizer
      日本海洋学会2016年度秋季大会
    • Place of Presentation
      鹿児島大学, 鹿児島県鹿児島市
    • Related Report
      2016 Research-status Report
  • [Presentation] 三陸内湾域における波浪と沖合海上風との関係2016

    • Author(s)
      小松幸生, 田中潔
    • Organizer
      日本海洋学会2016年度秋季大会
    • Place of Presentation
      鹿児島大学, 鹿児島県鹿児島市
    • Related Report
      2016 Research-status Report
  • [Presentation] 三陸リアス湾内におけるうねり性波浪と沖合海上風の関係2016

    • Author(s)
      小松幸生, 田中潔
    • Organizer
      日本流体力学会年会2016
    • Place of Presentation
      名古屋工業大学, 愛知県名古屋市
    • Related Report
      2016 Research-status Report
  • [Book] Kuroshio Current: Physical, Biogeochemical and Ecosystem Dynamics, Geophysical Monograph 2432019

    • Author(s)
      Komatsu Kosei, Hiroe Yutaka
    • Publisher
      John Wiley & Sons, Inc
    • Related Report
      2018 Annual Research Report
  • [Remarks] 新青丸KS-18-13航海

    • URL

      http://lmr.aori.u-tokyo.ac.jp/feog/kosei/photo.html

    • Related Report
      2018 Annual Research Report
  • [Remarks] 新青丸KS-18-11航海

    • URL

      http://lmr.aori.u-tokyo.ac.jp/feog/kosei/photo.html

    • Related Report
      2018 Annual Research Report
  • [Remarks] 大槌湾内赤浜沖におけるGPS波浪ブイによる波浪の係留観測

    • URL

      http://lmr.aori.u-tokyo.ac.jp/feog/kosei/photo.html

    • Related Report
      2018 Annual Research Report
  • [Remarks] 平塚沖タワーにおける多項目ブイの精度検証実験

    • URL

      http://lmr.aori.u-tokyo.ac.jp/feog/kosei/photo.html

    • Related Report
      2017 Research-status Report
  • [Remarks] 新青丸KS-17-10航海

    • URL

      http://lmr.aori.u-tokyo.ac.jp/feog/kosei/photo.html

    • Related Report
      2017 Research-status Report
  • [Remarks] 小松幸生研究室研究紹介

    • URL

      http://lmr.aori.u-tokyo.ac.jp/feog/kosei/research.html

    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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