An experimental study on wind-wave damping by raindrops' impingement

• Project/Area Number: 23760157
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Fluid engineering
• Research Institution: Kyoto University
• Principal Investigator: TAKAGAKI Naohisa 京都大学, 大学院・工学研究科, 助教 (00554221)
• Project Period (FY): 2011 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2012: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2011: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: 風波 / 降雨 / 運動量輸送

Research Abstract

The measurements in a wind-wave tank with rainfall show that the wind-wave damping by raindrops’ impingement more strongly depends on wind-wave height than wind speed and fetch. In addition, both measurements of velocity fluctuations in air and liquid and water-level fluctuation and visualization of water flow induced by falling drop show that turbulent fields in both air and liquid are strongly affected by rainfall and the downward flow on the liquid side is generated by impingement of raindropsnevertheless wind waves are damped by rainfall.

Research Products

• [Journal Article] Strong correlation between the drag coefficient and the shape of the wind sea spectrum over a broad range of wind speeds (2012)
  • Author(s): Takagaki, N., Koraori, S., Suzuki, N., Iwano, K., Kuramoto, T., Shimada, S., Kurose, R., Takahashi, K.
  • Journal Title: Geophysical Research Letters Volume: 39 Issue: 23
  • DOI: 10.1029/2012gl053988
  • Peer Reviewed
• [Presentation] 強風速下における風波の波形勾配の評価 (2012)
  • Author(s): 高垣直尚,倉本武典,神内浩行,岩野耕治,黒瀬良一,小森 悟
  • Organizer: 第90 期 日本機械学会 流体工学部門講演会
  • Place of Presentation: 同志社大学
  • Year and Date: 2012-11-17
• [Presentation] 砕波を伴う高風速下における水位変動の測定 (2012)
  • Author(s): 高垣直尚,島田 暁,倉本武典,岩野耕治,神内浩行,黒瀬良一,小森 悟
  • Organizer: 日本流体力学会 年会 2012
  • Place of Presentation: 高知大学
  • Year and Date: 2012-09-16
• [Presentation] 風波乱流場における気液間 CO2 移動に関する降雨パラメータの検討 (2012)
  • Author(s): 高垣直尚,坂本遼平,藤井一穂,岩野耕治,黒瀬良一,小森 悟
  • Organizer: 日本流体力学会 年会2012
  • Place of Presentation: 高知大学
  • Year and Date: 2012-09-16
• [Presentation] 高速風洞水槽を用いた風波界面上の抗力測定 (2012)
  • Author(s): 高垣直尚,岩野耕治,島田 暁,倉本武典,黒瀬良一,小森 悟
  • Organizer: 2012 年度日本海洋学会春季大会
  • Place of Presentation: 筑波大学
  • Year and Date: 2012-03-27
• [Presentation] Measurement of momentum flux across the air-water interface in high-speed wind-wave tank (2012)
  • Author(s): N. Takagaki & S. Komori
  • Organizer: Invited lecture: Japan Geoscience Union Meeting 2012AAS02-01
  • Place of Presentation: Makuhari Messe - International Convention Complex, Japan
• [Presentation] Effect of Fetch and Entrained Bubbles on Mass Transfer Velocity across the Wind-Driven Air-Water Interface with Wave Breaking (2012)
  • Author(s): K. Iwano, N. Takagaki, E. Ilyasov, R.Kurose & S. Komori
  • Organizer: The 8th KSME-JSME Thermal and Fluids Engineering Conference
  • Place of Presentation: Incheon, Korea
• [Presentation] Momentum transfer at the air-water interface in extremely-high wind conditions (2012)
  • Author(s): N. Takagaki, S. Shimada, T. Kuramoto, K. Iwano, R. Kurose & S. Komori
  • Organizer: 2012 Ocean Sciences Meeting
  • Place of Presentation: Salt lake City
• [Presentation] Measurement of momentum flux across the air-water interface in high-speed wind-wave tank (2012)
  • Author(s): N. Takagaki, S. Komori
  • Organizer: Japan Geoscience Union Meeting 2012
  • Place of Presentation: Makuhari, Japan
  • Invited
• [Presentation] 風波乱流場における気液間CO2移動に関する降雨パラメータの検討 (2012)
  • Author(s): 高垣直尚，坂本遼平，藤井一穂，岩野耕治，黒瀬良一，小森 悟
  • Organizer: 日本流体力学会 年会2012
  • Place of Presentation: 高知市，高知大学
• [Presentation] 砕波を伴う高風速下における水位変動の測定 (2012)
  • Author(s): 高垣直尚，島田暁，倉本武典，岩野耕治，神内浩行，黒瀬良一，小森 悟
  • Organizer: 日本流体力学会 年会2012
  • Place of Presentation: 高知市，高知大学
• [Presentation] 強風速下における風波の波形勾配の評価 (2012)
  • Author(s): 高垣直尚，倉本武典，神内浩行，岩野耕治，黒瀬良一，小森 悟
  • Organizer: 第90期 日本機械学会 流体工学部門講演会
  • Place of Presentation: 京都市・同志社大学
• [Presentation] Momentum transfer at the air-water interface in extremely-high wind conditions (2012)
  • Author(s): N. Takagaki, S. Shimada, T. Kuramoto, K. Iwano, R. Kurose & S. Komori
  • Organizer: 2012 Ocean Sciences Meeting
  • Place of Presentation: Salt lake city, Utah, USA
• [Presentation] Effect of Fetch and Entrained Bubbles on Mass Transfer Velocity across the Wind-Driven Air-Water Interface with Wave Breaking (2012)
  • Author(s): K. Iwano, N. Takagaki, E. Ilyasov, R. Kurose & S. Komori
  • Organizer: The 8th KSME-JSME Thermal and Fluids Engineering Conference
  • Place of Presentation: Songdo Convensia Cener, Songdo, Incheon, Korea
• [Presentation] 高速風洞水槽を用いた風波界面上の抗力測定 (2012)
  • Author(s): 高垣直尚，岩野耕治，島田 暁，倉本武典，黒瀬良一，小森 悟
  • Organizer: 2012年度日本海洋学会春季大会
  • Place of Presentation: 筑波大学
• [Presentation] 砕波を伴う高風速域における物質輸送量の評価 (2011)
  • Author(s): 岩野耕治, 高垣直尚, Ilyasov Emil, 黒瀬良一, 小森 悟
  • Organizer: 日本機械学会2011 年度年次大会
  • Place of Presentation: 東京工業大学大岡山キャンパス
  • Year and Date: 2011-09-13
• [Presentation] 高風速下における砕波気液界面を通しての運動量輸送 (2011)
  • Author(s): 倉本武典, 島田 暁, 岩野耕治, 高垣直尚, 黒瀬良一, 小森 悟
  • Organizer: 日本流体力学会年会 2011
  • Place of Presentation: 首都大学東京南大沢キャンパス
  • Year and Date: 2011-09-07
• [Presentation] 高風速下における砕波気液界面を通しての運動量輸送 (2011)
  • Author(s): 倉本武典，島田 暁，岩野耕治，高垣直尚，黒瀬良一，小森 悟
  • Organizer: 日本流体力学会 年会2011
  • Place of Presentation: 東京，首都大学東京
• [Presentation] 砕波を伴う高風速域における物質輸送量の評価 (2011)
  • Author(s): 岩野 耕治，高垣 直尚，Ilyasov Emil，黒瀬 良一，小森 悟
  • Organizer: 日本機械学会2011年度年次大会
  • Place of Presentation: 東京，東京工業大学