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Nature of Streaky Structures Observed with a Doppler Lidar

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タイトル: Nature of Streaky Structures Observed with a Doppler Lidar
著者: Yagi, Ayako 著作を一覧する
Inagaki, Atsushi 著作を一覧する
Kanda, Manabu 著作を一覧する
Fujiwara, Chusei 著作を一覧する
Fujiyoshi, Yasushi 著作を一覧する
キーワード: Doppler lidar
Roll vortices
Spacing of streaky structures
発行日: 2016年12月 7日
出版者: Springer
誌名: Boundary-layer meteorology
巻: 163
号: 1
開始ページ: 19
終了ページ: 40
出版社 DOI: 10.1007/s10546-016-0213-2
抄録: 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".
資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 藤吉 康志


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