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Structure of the airflow above surfa...

Buckley, Marc.

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Structure of the airflow above surface waves.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Structure of the airflow above surface waves./
作者:	Buckley, Marc.
面頁冊數:	172 p.
附註:	Source: Dissertation Abstracts International, Volume: 77-02(E), Section: B.
Contained By:	Dissertation Abstracts International77-02B(E).
標題:	Physical oceanography. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3730248
ISBN:	9781339164380

Structure of the airflow above surface waves.
Buckley, Marc.

Structure of the airflow above surface waves. - 172 p.

Source: Dissertation Abstracts International, Volume: 77-02(E), Section: B.

Thesis (Ph.D.)--University of Delaware, 2015.

In recent years, much progress has been made to quantify the momentum exchange between the atmosphere and the oceans. The role of the surface waves on the airflow dynamics is known to be significant but our physical understanding remains incomplete. The authors present detailed airflow measurements taken in the laboratory for 17 different wind-wave conditions with wave ages Cp/u* ranging from 1.4 to 66.7. For these experiments, a combined Particle Image Velocimetry (PIV) and Laser Induced Fluorescence (LIF) technique was developed. Two-dimensional (18.7 x 9.7 cm2) airflow velocity fields were obtained as low as 100 mum above the air-water interface. Temporal and spatial wave field characteristics were also obtained. When the wind stress is too weak to generate surface waves, the mean velocity profile follows the law of the wall; however, significant departures arise at higher wind speeds. With waves present, turbulent structures are directly observed in the airflow, whereby low horizontal velocity air is ejected away from the surface, and high velocity fluid is swept downward. Quadrant analysis shows that such positive turbulent momentum flux events dominate the turbulent boundary layer. Airflow separation is observed above young wind waves ( Cp/u*<3.7) and the resulting spanwise vorticity layers detached from the surface, produce intense wave-coherent turbulence. On average, the airflow is sheltered downwind of wave crests, above the critical height zetac (defined by &lang; u (zetac)&rang; = Cp). Below zetac, the coupling of the airflow with the waves causes a reversed, upwind sheltering effect. Finally, we show preliminary field measurements.

ISBN: 9781339164380Subjects--Topical Terms:

3168433
Physical oceanography.

Structure of the airflow above surface waves.
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245 1 0 $a Structure of the airflow above surface waves.
300 $a 172 p.
500 $a Source: Dissertation Abstracts International, Volume: 77-02(E), Section: B.
500 $a Adviser: Fabrice Veron.
502 $a Thesis (Ph.D.)--University of Delaware, 2015.
520 $a In recent years, much progress has been made to quantify the momentum exchange between the atmosphere and the oceans. The role of the surface waves on the airflow dynamics is known to be significant but our physical understanding remains incomplete. The authors present detailed airflow measurements taken in the laboratory for 17 different wind-wave conditions with wave ages Cp/u* ranging from 1.4 to 66.7. For these experiments, a combined Particle Image Velocimetry (PIV) and Laser Induced Fluorescence (LIF) technique was developed. Two-dimensional (18.7 x 9.7 cm2) airflow velocity fields were obtained as low as 100 mum above the air-water interface. Temporal and spatial wave field characteristics were also obtained. When the wind stress is too weak to generate surface waves, the mean velocity profile follows the law of the wall; however, significant departures arise at higher wind speeds. With waves present, turbulent structures are directly observed in the airflow, whereby low horizontal velocity air is ejected away from the surface, and high velocity fluid is swept downward. Quadrant analysis shows that such positive turbulent momentum flux events dominate the turbulent boundary layer. Airflow separation is observed above young wind waves ( Cp/u*<3.7) and the resulting spanwise vorticity layers detached from the surface, produce intense wave-coherent turbulence. On average, the airflow is sheltered downwind of wave crests, above the critical height zetac (defined by &lang; u (zetac)&rang; = Cp). Below zetac, the coupling of the airflow with the waves causes a reversed, upwind sheltering effect. Finally, we show preliminary field measurements.
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