Effect of wave and wind speed fluctuations on drag coefficient

• Project/Area Number: 18H01284
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 17020:Atmospheric and hydrospheric sciences-related
• Research Institution: Kindai University
• Principal Investigator: Suzuki Naoya 近畿大学, 理工学部, 教授 (40422985)
• Co-Investigator(Kenkyū-buntansha): 高垣 直尚 兵庫県立大学, 工学研究科, 准教授 (00554221) ; 早稲田 卓爾 東京大学, 大学院新領域創成科学研究科, 教授 (30376488)
• Project Period (FY): 2018-04-01 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000); Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2021: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2020: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000); Fiscal Year 2019: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000); Fiscal Year 2018: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
• Keywords: 風の海面摩擦係数 / 風速・風向変動 / 表層流 / うねり / 海面状態 / 風の海面摩擦係数の変動 / 有義波高 / 海面応力 / 大気・海洋間運動量輸送 / 風波 / 波浪 / 海流 / 吹走距離 / 浅海波

Outline of Final Research Achievements

The effect of the fluctuation of waves and wind speed on the variation factor of the drag coefficient for the wind speeds was investigated in a laboratory and field. The knowledge about the variation of the drag coefficient on the presence of component wave and surface current with following wind wave and was obtained by laboratory measurements. The knowledge about the variation of the drag coefficient on the fluctuation of the time-series of mean wind speed and significant wave height and the fluctuation of the instantaneous wind speed were obtained by field measurements. In addition, new knowledge was obtained that the fluctuation of wind direction is also a factor in the variation factor of the drag coefficient. And The method using the IMU sensor for more accurate observation was proposed using the small wind stress and wave buoy.

Academic Significance and Societal Importance of the Research Achievements

地球環境変化やその基礎となる気候システムの変動・変化の最も基本的な要素の１つである大気・海洋間運動量フラックスを求めるための重要なパラメータである風の海面摩擦係数が風速に対して大きく変動し、その変動要因の知見が十分でないため、精度の良い風の海面摩擦係数モデルは確立されていない。本研究は、風の海面摩擦係数の変動要因として波浪の影響のみでなく海面上を吹く風速の変動に着目し、波浪の影響のみならず風速・風向変動によっても風の海面摩擦係数の変動要因となる知見が得られ、さらにブイで高精度観測を行うための新たな手法を提案したことに学術的および社会的な意義がある。

Research Products

• [Int'l Joint Research] IAP, the Russian Academy of Sciences(ロシア連邦)
• [Int'l Joint Research] Russian Academy of Sciences(ロシア連邦)
• [Journal Article] DEVELOPMENT OF SMALL BUOY WITH MULTI-IMU SENSORS FOR ESTIMATION OF OCEAN WAVE CONDITIONS (2022)
  • Author(s): UETANI Hiroaki、SUZUKI Naoya、IKEDA Astutoshi
  • Journal Title: Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) Volume: 78 Issue: 2 Pages: I_121-I_126
  • DOI: 10.2208/kaigan.78.2_I_121
  • ISSN: 1883-8944, 1884-2399
  • Peer Reviewed
• [Journal Article] Effects of wind fluctuations and various drag coefficient models on air-sea momentum flux estimation at high wind speeds (2022)
  • Author(s): Naoya Suzuki, Yohei Ueda, Naohisa Takagaki, Iwao Ueki, Atsutoshi Ikeda
  • Journal Title: Journal of Advanced Marine Science and Technology Society Volume: -
  • Peer Reviewed / Open Access
• [Journal Article] Effects of air-side freestream turbulence on the development of air-liquid surface waves (2020)
  • Author(s): Takagaki Naohisa、Suzuki Naoya、Takahata Shunsaku、Kumamaru Hiroshige
  • Journal Title: Experiments in Fluids Volume: 61 Issue: 6 Pages: 136-136
  • DOI: 10.1007/s00348-020-02977-9
  • Peer Reviewed / Open Access
• [Journal Article] Effects of current on wind waves in strong winds (2020)
  • Author(s): Takagaki Naohisa、Suzuki Naoya、Troitskaya Yuliya、Tanaka Chiaki、Kandaurov Alexander、Vdovin Maxim
  • Journal Title: Ocean Science Volume: 16 Issue: 5 Pages: 1033-1045
  • DOI: 10.5194/os-16-1033-2020
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] DEVELOPMENT OF THE LOOP METHOD ON LONG-FETCH CONDITIONS IN WIND WAVE TANK - CONSTRUCTION OF LOOP-TYPE WIND AND WAVE HYBRID METHOD - (2020)
  • Author(s): UEMURA Yusuke、TAKAGAKI Naohisa、SUZUKI Naoya
  • Journal Title: Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) Volume: 76 Issue: 2 Pages: I_1399-I_1404
  • DOI: 10.2208/kaigan.76.2_I_1399
  • NAID: 130007935832
  • ISSN: 1883-8944, 1884-2399
  • Peer Reviewed
• [Journal Article] QUANTITATIVE EVALUATION OF ANEMOMETER MOTION COMPENSATION METHOD USING MULTIPLE IMU SENSORS (2019)
  • Author(s): TANIGUCHI Hiroto、SUZUKI Naoya、GARCIA Gustavo、IKEDA Atsutoshi
  • Journal Title: Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) Volume: 75 Issue: 2 Pages: I_1303-I_1308
  • DOI: 10.2208/kaigan.75.I_1303
  • NAID: 130007730080
  • ISSN: 1883-8944, 1884-2399
  • Peer Reviewed
• [Journal Article] Effect of Ships on Wind Flow in Ocean Wind Measurements Using a Numerical Simulation (2019)
  • Author(s): Naoya Suzuki, Takenobu Michioka, Masanori Konda, Kunio Kutsuwada, Yuji Masuda
  • Journal Title: Journal of Advanced Marine Science and Technology Society Volume: 25 Issue: 1 Pages: 1-14
  • DOI: 10.14928/amstec.25.1_1
  • NAID: 130007688460
  • ISSN: 1341-2752, 2188-3262
  • Peer Reviewed / Open Access
• [Journal Article] Comparison of the accuracy of various global wind speed datasets obtained from satellites and reanalyses (2018)
  • Author(s): Naoya Suzuki, Masanori Konda, Kunio Kutsuwada, Kyota Utsunomiya
  • Journal Title: Journal of Advanced Marine Science and Technology Society Volume: 24 Issue: 2 Pages: 31-37
  • DOI: 10.14928/amstec.24.2_31
  • NAID: 130007554160
  • ISSN: 1341-2752, 2188-3262
  • Peer Reviewed / Open Access
• [Presentation] IMUセンサを複数搭載した小型ブイによる波のパラメータ推定 (2022)
  • Author(s): 上谷太陽、鈴木直弥、池田篤俊
  • Organizer: ロボティクス・メカトロニクス講演会2022
• [Presentation] 海洋での波情報計測に向けたIMUセンサ搭載小型ブイの開発 (2022)
  • Author(s): 上谷太陽、鈴木直弥、池田篤俊
  • Organizer: 第69回海岸工学講演会
• [Presentation] Development Consecutive Sensing Buoy System for Measurement of Ocean Waves (2022)
  • Author(s): Hiroaki Uetani, Naoya Suzuki, Atsutoshi Ikeda
  • Organizer: American Geophysical Union Fall Meeting 2022
  • Int'l Joint Research
• [Presentation] Development of small buoy with built-in multiple IMU for sea surface condition measurement (2022)
  • Author(s): Atsutoshi Ikeda, Naoya Suzuki, Hiroaki Uetani, Hiroto Taniguchi
  • Organizer: American Geophysical Union, Ocean Sciences Meeting 2022
  • Int'l Joint Research
• [Presentation] Motion Compensation of an Anemometer Using Multiple IMU Sensors in a World Coordinate System (2021)
  • Author(s): Hiroto Taniguchi, Naoya Suzuki, Gustavo Garcia, Astutoshi Ikeda
  • Organizer: American Meteorological Society 101st Annual Meeting
  • Int'l Joint Research
• [Presentation] 強烈な砕波を伴う気液界面における運動量輸送量の測定手法の構築 (2020)
  • Author(s): 合田総一郎, 高垣直尚, 鈴木直弥, 松田景吾, 小森悟, Yuliya Troitskaya
  • Organizer: 2020年度日本機械学会年次大会
• [Presentation] 風波水槽での高風速時の砕波を伴う大気・海洋間運動量輸送の評価 (2020)
  • Author(s): 合田 総一郎, 高垣 直尚, 鈴木 直弥, 松田 景吾, 小森 悟, Yuliya Troitskaya
  • Organizer: 海洋理工学会令和2年度秋季大会
• [Presentation] 全球規模での大気・ 海洋運動量フラックス積算における海上風速データの時間解像度および抵 抗係数モデルの相違による影響評価 (2020)
  • Author(s): 上田 陽平, 鈴木 直弥, 高垣 直尚, 植木 巌
  • Organizer: 海洋理工学会令和2年度秋季大会
• [Presentation] 強風時の大気・海洋間運動量輸送に及ぼす浅瀬の影響 (2020)
  • Author(s): 佐々木 燦汰, 高垣 直尚, 鈴木 直弥
  • Organizer: 海洋理工学会令和2年度秋季大会
• [Presentation] Effect of the fluctuation of the wind speed and direction on the drag coefficient investigated using tower-based measurements (2020)
  • Author(s): Naoya Suzuki, Takuji Waseda
  • Organizer: American Geophysical Union, Ocean Sciences Meeting
  • Int'l Joint Research
• [Presentation] Rotational motion compensation towards precise wind speed measurement on the sea (2020)
  • Author(s): Hiroto Taniguchi, Naoya Suzuki, Gustavo Garcia, Atsutoshi Ikeda
  • Organizer: American Geophysical Union, Ocean Sciences Meeting
  • Int'l Joint Research
• [Presentation] Sea surface effects on the growth of wind wave in laboratory experiment (2020)
  • Author(s): Chiaki Tanaka, Naoya Suzuki, Naohisa Takagaki, Yuliya Troitskaya, Satoru Komori, Alexander Kandaurov, Maxim Vdovin, Masanori Konda
  • Organizer: American Geophysical Union, Ocean Sciences Meeting
  • Int'l Joint Research
• [Presentation] Measurement method of the wind stress at high wind speeds in laboratory experiment (2020)
  • Author(s): Temma Onishi, Naohisa Takagaki, Naoya Suzuki
  • Organizer: American Geophysical Union, Ocean Sciences Meeting
  • Int'l Joint Research
• [Presentation] Effect of component waves on drag coefficient in laboratory experiment (2020)
  • Author(s): Rikuya Maekawa, Naoya Suzuki, Naohisa Takagaki
  • Organizer: American Geophysical Union, Ocean Sciences Meeting
  • Int'l Joint Research
• [Presentation] Development of the loop method on long-fetch conditions in wind wave tank (2020)
  • Author(s): Yusuke Uemura, Naohisa Takagaki, Naoya Suzuki
  • Organizer: American Geophysical Union, Ocean Sciences Meeting
  • Int'l Joint Research
• [Presentation] 風波水槽での吹送距離延長のための気流ループ法の確立－気流・波ハイブリッドループ法に向けて－ (2019)
  • Author(s): 上村友祐、高垣直尚、鈴木直弥
  • Organizer: 海洋理工学会2019年度春季大会
• [Presentation] 観測塔周りの気流を対象としたLarge-eddy simulation (2019)
  • Author(s): 道岡武信、鈴木直弥
  • Organizer: 日本流体力学会 年会2019
• [Presentation] 風波水槽での大気・海洋間運動量輸送における表層流の影響の検討に向けた初期実験 (2019)
  • Author(s): 田中千晶、鈴木直弥、高垣直尚、根田昌典
  • Organizer: 海洋理工学会2019年度秋季大会
• [Presentation] 風波水槽での気側ループ法の確立および風速鉛直分布の相違による風波への影響の検討 (2018)
  • Author(s): 上村友祐、高垣直尚、鈴木直弥、小森悟
  • Organizer: 平成30年度海洋理工学会春季大会
• [Presentation] 平塚観測塔が周辺の気流に及ぼす影響 (2018)
  • Author(s): 白石涼、道岡武信、鈴木直弥
  • Organizer: 第59回大気環境学会年会
• [Presentation] 風波水槽を使用した風波の発達における気側乱流の影響 (2018)
  • Author(s): 大西天真、高垣直尚、鈴木直弥、小森悟、井上海地
  • Organizer: 平成30年度海洋理工学会秋季大会
• [Presentation] 風波水槽実験による抵抗係数の変動における成分波の影響 (2018)
  • Author(s): 前川莉玖弥、高垣直尚、鈴木直弥、小森悟
  • Organizer: 平成30年度海洋理工学会秋季大会
• [Presentation] 高精度な海面風応力計測に向けた超音波風速計の動揺補正実験 (2018)
  • Author(s): 谷口 寛人、鈴木 直弥、池田 篤俊
  • Organizer: 第19回計測自動制御学会システムインテグレーション部門講演会