Elucidation of relationship between offshore wind waves and sea surface drag coefficient through direct measurements of wind turbulence by a drifting buoy
| Project/Area Number |
16K13878
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Meteorology/Physical oceanography/Hydrology
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| Research Institution | The University of Tokyo |
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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)
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| 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)
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| 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 |
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| 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.
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| 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。
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Report
(4 results)
Research Products
(22 results)
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[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
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Journal Title
Journal of Oceanography
Volume: 73
Issue: 1
Pages: 25-38
DOI
Related Report
Peer Reviewed
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