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| Mixing in Shallow Waters： Measurements, Processing, and Applications | |
| 作者姓名： | Iossif Lozovatsky Elena Roget H.J.S.Fernado |
| 作者单位： | Environmental Fluid Dynamics Program Arizona State University,Tempe,85287-6106,U.S.A. P.P.Shirshov Institute of Oceanology,Russian Academy of Sciences,Moscow,117851,Russia,University of Girona,Girona E-17071,Catalonia,Spain,Environmental Fluid Dynamics Program,Arizona State University,Tempe,85287-6106,U.S.A. |
| 基金项目： | The work was supported by the US 0ffice of Naval Research （ N00014-97-1-0140 and N00014-05-1-0245 ） and by the Spanish Government （GL2004-02027/HID）. |
| 摘 要： | Microstructure profiling measurements taken on a shallow Black Sea shelf and in Lake Banyoles and Boadella reservoir (Both in Spain) are analyzed to investigate the influence of boundary-layer-induced turbulence of various sources on mixing in the water interior. The state of turbulence in shallow waters is examined and details of microstructure data processing and error analysis are discussed. The dependence between averaged activity parameter AG and buoyancy Reynolds number Reb for the shelf turbulence indicates that for Reb < 1 the state of turbulence can be described by the fossil turbulence model, which postulates AG-Reb1/2. For Reb> 1, however, the influence of Reb on AG is weak, signifying that the buoyancy Reynolds number can no longer serve as the governing parameter for active turbulent mixing. The generation of turbulence by a one-minute long wind bursts (the Boadella reservoir) increases the averaged dissipation rate (e) of the surface mixed layer by more than 5 times (up to 3×10-6 W kg-1). The influence of the wind bursts was also traced below the ther-mocline, where turbulent patches with |
| 关 键 词： | 湍流 海洋动力学 微观结构 扩散性 气候系统 |
| 文章编号： | 1672-5182（2005）04-293-13 |
| 收稿时间： | 2005-04-07 |
| 修稿时间： | 2005-09-21 |
Mixing in shallow waters: Measurements,processing, and applications |
|
| Iossif Lozovatsky,Elena Roget,H.J.S.Fernado.Mixing in shallow waters: Measurements,processing, and applications[J].Journal of Ocean University of China,2005,4(4):293-305. | |
| Authors: | |
| Affiliation: | 1. Environmental Fluid Dynamics Program, Arizona State University, Tempe, 85287-6106, U.S.A.;P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, 117851, Russia 2. University of Girona, Girona E- 17071, Catalonia, Spain 3. Environmental Fluid Dynamics Program, Arizona State University, Tempe, 85287-6106, U.S.A. |
| Abstract: | Microstructure profiling measurements taken on a shallow Black Sea shelf and in Lake Banyoles and Boadella reservoir (Both
in Spain) are analyzed to investigate the influence of boundary-layer-induced turbulence of various sources on mixing in the
water interior. The state of turbulence in shallow waters is examined and details of microstructure data processing and error
analysis are discussed. The dependence between averaged activity parameter Ā
G
and buoyancy Reynolds number
, for the shelf turbulence indicates that for
<1 the state of turbulence can be described by the fossil turbulence model, which postulates Ā
G
∼Re
b
1/2
. For
>1, however, the influence of
, on Ā
G
is weak, signifying that the buoyancy Reynolds number can no longer serve as the governing parameter for active turbulent
mixing. The generation of turbulence by a one-minute long wind bursts (the Boadella reservoir) increases the averaged dissipation
rate 〈ɛ〉 of the surface mixed layer by more than 5 times (up to 3×10−6 W kg−1). The influence of the wind bursts was also traced below the thermocline, where turbulent patches with 〈ɛ〉=(10−7−10−6) W kg−1 were generated. It is shown that the geothermal convection in Lake Banyoles produces intermittent turbulent patches with
characteristic dissipation rate 〈ɛ〉=(2×l0−8−3×10−7) W kg−1, which influences the overall vertical mixing in the basin. |
| Keywords: | mixing turbulence microstructure dissipation diffusivity convection shallow basins |
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