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In-Street Wind Direction Variability in the Vicinity of a Busy Intersection in Central London |
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| Authors: | Ahmed A Balogun Alison S Tomlin Curtis R Wood Janet F Barlow Stephen E Belcher Robert J Smalley Justin J N Lingard Sam J Arnold Adrian Dobre Alan G Robins Damien Martin Dudley E Shallcross |
| Institution: | 1. Energy and Resources Research Institute, SPEME, University of Leeds, Leeds, West Yorkshire, LS2 9JT, UK 7. Department of Meteorology, Federal University of Technology, Akure, PMB 704, Akure, Ondo State, Nigeria 2. Department of Meteorology, University of Reading, Earley Gate, P.O. Box 243, Reading, RG6 6BB, UK 3. Centre for Australian Weather and Climate Research (CAWCR), Bureau of Meteorology, GPO Box 1289K, Melbourne, VIC, 3001, Australia 4. Golder Associates (UK) Ltd, Nottinghamshire, NG12 5BL, UK 5. EnFlo, Department of Engineering, University of Surrey, Guildford, Surrey, GU2 7XH, UK 6. School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK |
| Abstract: | 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 (θ ref ) 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 roof-top 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 θ ref of 5°–10°) 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. |
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