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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Ahmad MK, Chaudhry KK (2005) Wind tunnel simulation studies on dispersion at urban street canyons and intersections—a review. J Wind Eng Ind Aerodyn 93: 697–717
Allwine KJ, Leach MJ, Stockham LW, Shinn JS, Hosker RP, Bowers JF, Pace JC (2004) Overview of joint urban 2003—an atmospheric dispersion study in Oklahoma City. Preprints, Symposium on planning, nowcasting, and forecasting in the urban zone, Seattle, WA. AMS, CDROM, J7.1, 9 pp
Arnold S, ApSimon H, Barlow JF, Belcher S, Bell M, Boddy JWD, Britter R, Cheng H, Clark R, Colvile R, Dimitroulopoulou S, Dobre A, Greally B, Kaur S, Knights A, Lawton T, Makepeace A, Martin D, Neophytou M, Neville S, Nieuwenhuijsen M, Nickless G, Price C, Robins A, Shallcross D, Simmonds P, Smalley R, Tate J, Tomlin AS, Wang H, Walsh P (2004) Dispersion of air pollution and penetration into the local environment, DAPPLE. Sci Total Environ 332: 139–153
Barlow AF, Dobre A, Smalley RJ, Arnold SJ, Tomlin AS, Belcher SE (2009) Referencing of street-level flows: results from the DAPPLE 2004 campaign in London, UK. Atmos Environ 43: 5536–5544
Boddy JWD, Smalley RJ, Dixon NS, Tate JE, Tomlin AS (2005) The spatial variability in concentrations of a traffic-related pollutant in two street canyons in York, UK. Part I: the influence of background winds. Atmos Environ 39: 3147–3161
Britter RE, Hanna SR (2003) Flow and dispersion in urban areas. Annu Rev Fluid Mech 35: 469–496
Carpentieri M, Robins A, Baldi S (2009) Three-dimensional mapping of wind flow at an urban canyon intersection. Boundary-Layer Meteorol 133: 277–296
DePaul FF, Sheih CM (1986) Measurements of wind velocities in a street canyon. Atmos Environ 20: 455–459
Dixon NS, Boddy JWD, Smalley RJ, Tomlin AS (2006) Evaluation of a turbulent flow and dispersion model in a typical street canyon in York, UK. Atmos Environ 40: 958–972
Dobre A, Arnold SJ, Smalley RJ, Boddy JWD, Barlow JF, Tomlin AS, Belcher SE (2005) Flow field measurements in the in the proximity of an urban in London, UK. Atmos Environ 39: 4647–4657
Eliasson I, Offerle B, Grimmond CSB, Lindqvist S (2006) Wind fields and turbulence statistics in an urban street canyon. Atmos Environ 40: 1–16
Hanna SR, Brown MJ, Camelli FE, Chan S, Coirier WJ, Hansen OR, Huber AH, Kim S, Reynolds RM (2006) Detailed simulations of atmospheric flow and dispersion in urban downtown areas by computational fluid dynamics (CFD) models—an application of five CFD models to Manhattan. Bull Am Meteorol Soc 87: 1713–1726
Hanna SR, White J, Zhou Y (2007) Observed winds, turbulence and dispersion in built-up downtown areas of Oklahoma City and Manhattan. Boundary-Layer Meteorol 125: 441–468
Johnson GT, Hunter LJ (1999) Some insights into typical urban canyons airflows. Atmos Environ 33: 3991–3999
Kastner-Klein P, Plate EJ (1999) Wind-tunnel study of concentration fields in street canyons. Atmos Environ 33: 3973–3979
Kastner-Klein P, Rotach MW (2004) Mean flow and turbulence characteristics in an urban roughness sublayer. Boundary-Layer Meteorol 111: 55–84
Klein P, Clark JV (2007) Flow variability in a North American downtown canyon. J Appl Meteorol Climatol 46: 851–877
Klein P, Leitl B, Schatzmann M (2007) Driving physical mechanisms of flow and dispersion in urban canopies. Int J Climatol 27: 1887–1907
Longley ID, Gallagher MW, Dorsey JR, Flynn M, Barlow JF (2004) Short-term measurements of airflow and turbulence in two street canyons in Manchester. Atmos Environ 38: 69–79
Macdonald RW (2000) Modeling the mean velocity profile in the urban canopy layer. Boundary-Layer Meteorol 97: 25–45
Martin D, Price CS, White IR, Nickless G, Dobre A, Shallcross DE (2008) A study of pollutant concentration variability in an urban street under low wind speeds. Atmos Sci Lett 9: 147–152
Nakamura Y, Oke TR (1988) Wind, temperature and stability conditions in an east–west oriented urban canyon. Atmos Environ 22: 2691–2700
Nielson M (2000) Turbulent ventilation of a street. Environ Monit Assess 65: 389–396
Oke TR (1976) The distinction between canopy and boundary-layer heat island. Atmosphere 14: 269–277
Raupach MR, Thorn AS, Edwards I (1980) A wind-tunnel study of turbulent flow close to regularly arranged rough surfaces. Boundary-Layer Meteorol 18: 373–397
Robins A, Savory E, Scaperdas A, Grigoriadis D (2002) Spatial variability and source–receptor relations at a street intersection. Water Air Soil Pollut Focus 2: 381–393
Rotach MW (1995) Profiles of turbulence statistics in and above an urban street canyon. Atmos Environ 29: 1473–1486
Rotach MW (1999) On the influence of the urban roughness sublayer on turbulence and dispersion. Atmos Environ 33: 4001–4008
Rotach MW, Vogt R, Bernhofer C, Batchvarova E, Christen A, Clappier A, Feddersen B, Gryning SE, Martucci G, Mayer H, Mitev V, Oke TR, Parlow E, Richner H, Roth M, Roulet YA, Ruffieux D, Salmond J, Schatzmann M, Vogt J (2005) BUBBLE—an urban boundary layer meteorology project. Theor Appl Climatol 81: 231–261
Roth M (2000) Review of atmospheric turbulence over cities. Q J R Meteorol Soc 126: 941–990
Scaperdas A, Colvile RN (1999) Assessing the representativeness of monitoring data from an urban intersection site in central London, UK. Atmos Environ 33: 661–674
Scaperdas A, Robins AG, Colville RN (2000) Flow visualisation and tracer dispersion experiments at street canyon intersections. Int J Environ Pollut 14: 526–537
Sculley RD (1989) Vehicle emission rate analysis for carbon monoxide hot spot modelling. J Air Pollut Control Assoc 39: 1334–1343
Shallcross DE, Martin D, Price CS, Nickless G, White IR, Petersson F, Britter RE, Neophytou MK, Tate JE, Tomlin AS, Barlow JF, Robins A (2009) Short range dispersion experiments using fixed and moving sources. Atmos Sci Lett 10: 59–65
Smalley RJ, Tomlin AS, Dixon NS, Boddy JWD (2008) The influence of background wind direction on the roadside turbulent velocity field within a complex urban street. Q J R Meteorol Soc 134: 1371–1384
Soulhac L, Mejean P, Perkins R (2001) Modelling the transport and dispersion of pollutants in street canyons. Int J Environ Pollut 16: 404–416
Soulhac L, Garbero V, Salizzoni P, Mejean P, Perkins RJ (2009) Flow and dispersion in street intersections. Atmos Environ 43: 2981–2996
Sugawara H, Hagishima A, Narita K, Ogawa H, Yamano M (2008) Temperature and wind distribution in an E-W-oriented urban street canyon. Sci Online Lett Atmos 4: 53–56
Tate J, Ropkins K, Goodman P, Oates C, Chen H, Bell M, Tomlin A, Balogun A, Smalley R (2009) The influence of traffic congestion, synoptic and in-street winds on NO2 concentrations around a congested intersection: a measurement study. In: Proceedings of the 7th international conference on air quality—science and application, CDROM, 4 pp
Tomlin AS, Smalley RJ, Boddy JWD, Tate JE, Arnold SJ, Dobre A, Barlow JF, Belcher SE (2009) A field study of factors influencing the concentrations of a traffic related pollutant in the vicinity of a complex urban junction. Atmos Environ 43: 5027–5037
Vardoulakis S, Fisher BEA, Pericleou K, Gonzalez-Flesca N (2003) Modelling air quality in street canyons: a review. Atmos Environ 37: 155–182
Wang X, McNamara KF (2007) Effects of street orientation on dispersion at or near urban street intersections. J Wing Eng Ind Aerodyn 95: 1526–1540
Wood CR, Arnold SJ, Balogun AA, Barlow JF, Belcher SE, Britter RE, Cheng H, Dobre A, Lingard JJN, Martin D, Neophytou MK, Petersson FK, Robins AG, Shallcross DE, Smalley RJ, Tate JE, Tomlin AS, White IR (2009) Dispersion experiments in central London: the 2007 DAPPLE project. Bull Am Meteorol Soc 90: 955–969
Zamurs J (1990) Intersection carbon monoxide modelling. J Air Waste Manag Assoc 40: 769–771
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Balogun, A.A., Tomlin, A.S., Wood, C.R. et al. In-Street Wind Direction Variability in the Vicinity of a Busy Intersection in Central London. Boundary-Layer Meteorol 136, 489–513 (2010). https://doi.org/10.1007/s10546-010-9515-y
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DOI: https://doi.org/10.1007/s10546-010-9515-y