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Title: Observations of Coherent Turbulence Structures in the Near-Neutral Atmospheric Boundary Layer
Authors: Horiguchi, Mitsuaki  kyouindb  KAKEN_id
Hayashi, Taiichi  KAKEN_id
Hashiguchi, Hiroyuki  kyouindb  KAKEN_id  orcid (unconfirmed)
Ito, Yoshiki
Ueda, Hiromasa
Author's alias: 堀口, 光章
Keywords: Atmospheric boundary layer
Coherent structures
Doppler sodar
Ejections and sweeps
Momentum transfer
Wavelet transform
Issue Date: Jul-2010
Publisher: Springer Science+Business Media B.V.
Journal title: Boundary-Layer Meteorology
Volume: 136
Issue: 1
Start page: 25
End page: 44
Abstract: Turbulence structures of high Reynolds number flow in the near-neutral atmospheric boundary layer (ABL) are investigated based on observations at Shionomisaki and Shigaraki, Japan. A Doppler sodar measured the vertical profiles of winds in the ABL. Using the integral wavelet transform for the time series of surface wind data, the pattern of a descending high-speed structure with large vertical extent (from the surface to more than 200-m level) is depicted from the Doppler sodar data. Essentially this structure is a specific type of coherent structure that has been previously shown in experiments on turbulent boundary-layer flows. Large-scale high-speed structures in the ABL are extracted using a long time scale (240 s) for the wavelet transform. The non-dimensional interval of time between structures is evaluated as 3.0–6.2 in most cases. These structures make a large contribution to downward momentum transfer in the surface layer. Quadrant analyses of the turbulent motion measured by the sonic anemometer (20-m height) suggest that the sweep motion (high-speed downward motion) plays a substantial role in the downward momentum transfer. In general, the contribution of sweep motions to the momentum flux is nearly equal to that of ejection motions (low-speed upward motions). This contribution of sweep motions is related to the large-scale high-speed structures.
Rights: The original publication is available at
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
DOI(Published Version): 10.1007/s10546-010-9500-5
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