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Nature of Streaky Structures Observed with a Doppler Lidar

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Title: Nature of Streaky Structures Observed with a Doppler Lidar
Authors: Yagi, Ayako Browse this author
Inagaki, Atsushi Browse this author
Kanda, Manabu Browse this author
Fujiwara, Chusei Browse this author
Fujiyoshi, Yasushi Browse this author
Keywords: Doppler lidar
Roll vortices
Spacing of streaky structures
Issue Date: 7-Dec-2016
Publisher: Springer
Journal Title: Boundary-layer meteorology
Volume: 163
Issue: 1
Start Page: 19
End Page: 40
Publisher DOI: 10.1007/s10546-016-0213-2
Abstract: Observations using a three-dimensional scanning coherent Doppler lidar in an urban area revealed the characteristics of streaky structures above a rough, inhomogeneous surface for a high-Reynolds-number flow. The study focused on two points: (1) the frequency of occurrence and conditions required for the presence of streaky structures, and (2) the universal scaling of the spacing of streaky structures (. The horizontal snapshots of the radial velocity were visually classified into six groups: Streak, Mixed, Fishnet, No streak, Front, and Others. The Streak category accounted for more than 50% of all possible flows and occurred when the horizontal wind speed was large and the atmospheric stratification was near-neutral. The spacing ( was estimated from the power spectral density of the streamwise velocity fluctuations along the spanwise direction. The spacing decreased with an increase in the local velocity gradient. Furthermore, it was revealed that the local velocity gradient normalized by the friction velocity and the boundary-layer height ( comprehensively predicts under various experimental and environmental conditions, in terms of the scale of motion (i.e., indoor and outdoor scales), thermal stratification (i.e., from weakly unstable to stable stratification), and surface roughness (i.e., from flat to very rough surfaces).
Rights: "The final publication is available at".
Type: article (author version)
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 藤吉 康志

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