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- Publisher
- Springer Journals
- Copyright
- Copyright © 2016 by Springer Science+Business Media Dordrecht
- Subject
- Earth Sciences; Atmospheric Sciences; Meteorology; Atmospheric Protection/Air Quality Control/Air Pollution
- ISSN
- 0006-8314
- eISSN
- 1573-1472
- DOI
- 10.1007/s10546-016-0213-2
- Publisher site
- See Article on Publisher Site
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 ( $$\lambda )$$ λ ) . 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 ( $$\lambda )$$ λ ) was estimated from the power spectral density of the streamwise velocity fluctuations along the spanwise direction. The spacing $$\lambda $$ λ 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 ( $$z_i )$$ z i ) comprehensively predicts $$\lambda /z_i $$ λ / z i 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).
Journal
Boundary-Layer Meteorology – Springer Journals
Published: Dec 7, 2016