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Volume 19 Issue 4

Jul.  2002

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Article >  ADVANCES IN ATMOSPHERIC SCIENCES  > 2002 >  19(4): 687-698

Identification of Coherent Structures of Turbulence at the Atmospheric Surface Layer

  • 1.

    LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029


doi: 10.1007/s00376-002-0008-x

  • A parameter-free method based on orthonormal wavelet transforms is recommended for calculating the principal time scale of coherent structures in atmospheric boundary-layer measurements. First, the atmospheric turbulent signal is decomposed into the small scate vortex that has approximate isotropy and the large scale vortex with the digital filter. Then, the large scale vortex is used to detect colterent structures with this method. The principal time scale and profile of coherent structures for velocity components (u, v, w)above rice fields are obtained. In order to testify the validity of this method, the correlation of coherent structures and non-coherent structures are also calculated.
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    • Manuscript History

    Manuscript received: 10 July 2002
    Manuscript revised: 10 July 2002
    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

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    Identification of Coherent Structures of Turbulence at the Atmospheric Surface Layer

    • 1. LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029
    • Manuscript received: 2002-07-10
    • Manuscript revised: 2002-07-10

    Abstract: A parameter-free method based on orthonormal wavelet transforms is recommended for calculating the principal time scale of coherent structures in atmospheric boundary-layer measurements. First, the atmospheric turbulent signal is decomposed into the small scate vortex that has approximate isotropy and the large scale vortex with the digital filter. Then, the large scale vortex is used to detect colterent structures with this method. The principal time scale and profile of coherent structures for velocity components (u, v, w)above rice fields are obtained. In order to testify the validity of this method, the correlation of coherent structures and non-coherent structures are also calculated.

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