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In-street wind direction variability in the vicinity of a busy intersection in central London

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Balogun, A. A., Tomlin, A. S., Wood, C. R., Barlow, J. F., Belcher, S. E., Smalley, R. J., Lingard, J. J. N., Arnold, S. J., Dobre, A., Robins, A. G., Martin, D. and Shallcross, D. E. (2010) In-street wind direction variability in the vicinity of a busy intersection in central London. Boundary-Layer Meteorology, 136 (3). pp. 489-513. ISSN 0006-8314

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To link to this article DOI: 10.1007/s10546-010-9515-y

Abstract/Summary

We present results from fast-response wind measurements within and above a busy intersection between two street canyons (Marylebone Road and Gloucester Place) in Westminster, London taken as part of the DAPPLE (Dispersion of Air Pollution and Penetration into the Local Environment; www.dapple.org.uk) 2007 field campaign. The data reported here were collected using ultrasonic anemometers on the roof-top of a building adjacent to the intersection and at two heights on a pair of lamp-posts on opposite sides of the intersection. Site characteristics, data analysis and the variation of intersection flow with the above-roof wind direction (θref) are discussed. Evidence of both flow channelling and recirculation was identified within the canyon, only a few metres from the intersection for along-street and across-street roof-top winds respectively. Results also indicate that for oblique rooftop flows, the intersection flow is a complex combination of bifurcated channelled flows, recirculation and corner vortices. Asymmetries in local building geometry around the intersection and small changes in the background wind direction (changes in 15-min mean θref of 5–10 degrees) were also observed to have profound influences on the behaviour of intersection flow patterns. Consequently, short time-scale variability in the background flow direction can lead to highly scattered in-street mean flow angles masking the true multi-modal features of the flow and thus further complicating modelling challenges.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical and Physical Sciences > Department of Meteorology
ID Code:5911
Uncontrolled Keywords:DAPPLE field campaign · Dispersion · Flow bifurcation · Flow channelling · Recirculation · Urban intersection
Additional Information:http://www.met.reading.ac.uk/bl_met/papers/Wood/
Publisher:Springer
Publisher Statement:The original publication is available at www.springerlink.com

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