|
Hokkaido University Collection of Scholarly and Academic Papers >
Institute of Low Temperature Science >
Peer-reviewed Journal Articles, etc >
Nature of Streaky Structures Observed with a Doppler Lidar
| 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 | | Streaks |
| 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 link.springer.com". |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/67786 |
| 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
|
