Mixing in Shallow Waters: Measurements, Processing, and Applications

作     者：Iossif Lozovatsky Elena Roget H.J.S.Fernado 

作者机构：Environmental Fluid Dynamics ProgramArizona State UniversityTempe85287-6106U.S.A. P.P.Shirshov Institute of OceanologyRussian Academy of SciencesMoscow117851Russia University of GironaGirona E-17071CataloniaSpain Environmental Fluid Dynamics ProgramArizona State UniversityTempe85287-6106U.S.A. 

出 版 物：《Journal of Ocean University of China》 (中国海洋大学学报（英文版）)

年 卷 期：2005年第4卷第4期

页      面：293-305页

学科分类：08[工学] 0816[工学-测绘科学与技术] 

基　　金：The work was supported by the US Office of Naval Research(N00014-97-1-0140 and N00014-05-l-0245) by the Spanish Government(GL2004-02027/HID) 

主　　题：mixing turbulence microstructure dissipation diffusivity convection shallow basins 1672-5182(2005)04-293-13 

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 A6 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 - Re b^1/2. For Reb 〉 1, however, the influence of Reb on Ao 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 （ε） 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 （ε） = （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 （ε） = （2 × 10^-8- 3 × 10^-7） W kg^-1, which influences the overall vertical mixing in the basin.