DAPPLE Science Meeting Tuesday 30 th November 2004, Imperial College London. Air Flow – Fieldwork: Sam Arnold (1&2), Adrian Dobre (2), Rob Smalley (3),

Slides:

Advertisements

Similar presentations

The University of Reading Helen Dacre AGU Dec 2008 Boundary Layer Ventilation by Convection and Coastal Processes Helen Dacre, Sue Gray, Stephen Belcher.

Advertisements

Vertical distribution of ash at source Time-height plots of mass concentration at Chilbolton. The height above the summit into which ash particles are.

Colman C.C. Wong & Chun-Ho Liu

 If it is assumed that  w is made up of a contribution from the mean wind and a contribution from the traffic, then it can be suggested that Introduction.

Ian Longley Physics Department, UMIST, Manchester, U.K. Fine scale temporal variation in ultrafine particle concentrations in a busy street canyon with.

Ian Longley Street canyon aerosol pollutant transport measurements in Manchester I.D. Longley, M.W. Gallagher, J.R. Dorsey, M. Flynn, K. Bower, I. Barlow.

Ian Longley Street canyon aerosol pollutant transport measurements in Manchester I.D. Longley, M.W. Gallagher, J.R. Dorsey, M. Flynn, K. Bower, I. Barlow.

Bridging the Gap Between Statistics and Engineering Statistical calibration of CFD simulations in Urban street canyons with Experimental data Liora Malki-Epshtein.

Characteristics of horizontal and vertical fluxes of CO 2 during the ADVEX Experiment at the Wetzstein site, in Thuringia, Germany Marcelo Zeri 1, Corinna.

Performance of Air Quality Models in Urban Areas  Objectives and Motivation  St. Louis study and ISC urban  Model Improvements  Performance of Improved.

10-Years Air Pollution Research In London. Sources of particles from a vehicle Emissions dependent upon vehicle speed (resuspension, tyre and road.

Current and future work: the ACTUAL and ClearfLo projects.

Carole Helfter 1, Anja Tremper 2, Giulia Zazzeri 3, Simone Kotthaus 4, Janet Barlow 4, Sue Grimmond 4 and Eiko Nemitz 1. Sources of greenhouse gases and.

The use of the BT Tower in Environmental Research in London APRIL meeting, 26 th Jan 2010.

Relating street level flows to BT Tower level flows: results from the DAPPLE 2004 campaign J. Barlow 1, A. Dobre 1, R. Smalley 2, S. Arnold 1, A. Tomlin.

PARTICLE FLUXES MEASURED BY EDDY COVARIANCE ABOVE AND WITHIN A DOWNTOWN URBAN CANOPY I.D. Longley, M.W. Gallagher School of Earth, Atmospheric & Environmental.

Clean air for London: ClearfLo David Green, King’s College London.

The impact of boundary layer dynamics on mixing of pollutants Janet F.Barlow 1, Tyrone Dunbar 1, Eiko Nemitz 2, Curtis Wood 1, Martin Gallagher 3, Fay.

BT Tower research APRIL network meeting on BT Tower research 26 th January 2010

NATO ADVANCED STUDY INSTITUTE, Kyiv, May 2004 Detailed numerical modeling of local atmospheric dispersion in an idealized urban area M. Milliez, S. Panzarella,

Ang Atmospheric Boundary Layer and Turbulence Zong-Liang Yang Department of Geological Sciences.

Urban Meteorology S. E. Belcher Department of Meteorology, University of Reading A. Agusti-Panareda, J. F. Barlow, M. J. Best, O. Coceal, S. L. Gray, I.

THE REGENTS PARK AND TOWER ENVIRONMENTAL EXPERIMENT REPARTEE 2006 & 2007 Roy M. Harrison University of Birmingham.

Modelling Pollution Dispersion in Urban Areas Silvana Di Sabatino Universita’ di Lecce, Dipartimento Scienza dei Materiali, Via Arnesano, Lecce (I)

COST 715 Meteorology Applied to Urban Air Pollution Problems September 98-September 2003 Problem Issues covered Successes Conclusions.

School of something FACULTY OF OTHER THE SENSITIVITY OF A 3D STREET CANYON CFD MODEL TO UNCERTAINTIES IN INPUT PARAMETERS James Benson*, Nick Dixon, Tilo.

DAPPLE December 2003 D ispersion of A ir P ollutants & their P enetration into the L ocal E nvironment Background Activities to date Results - tracer &

DAPPLE - Wind Tunnel Modelling H. Cheng and A. Robins University of Surrey Low resolution model (1:200) Experimental set-up Quality assurance for experiments.

Introduction & Background DAPPLE is a 4-year EPSRC funded project whose aim is to enhance understanding of pollutant dispersion processes in realistic.

The DAPPLE project: Overview and wind tunnel experiments Alan Robins 1, Paul Hayden 1, Janet Barlow 2, and the DAPPLE Consortium Home Office CBRN S&T Programme.

NCAS/APRIL Meeting on Urban Air Quality Modelling Dispersion modelling at Imperial College London Professor Helen ApSimon and Dr Roy Colvile Page 1/N ©

DAPPLE D ispersion of A ir P ollutants and P enetration into the L ocal E nvironment A Consortium Research Project funded by the UK EPSRC Engineering for.

D ispersion of A ir P ollutants & their P enetration into the L ocal E nvironment EPSRC Infrastructure & Environment Programme Dr Samantha Arnold (C.Geog.)

Results from the SMEAR III urban measurement station

UK Consortium Project funded by the EPSRC S. Arnold (1&2), H. ApSimon (1), J. Barlow (2), S. Belcher (2), M. Bell (3), R. Britter (4), H. Cheng (5), R.

Federal Department of Home Affairs FDHA Federal Office of Meteorology and Climatology MeteoSwiss High resolution COSMO runs for dispersion applications.

DAPPLE D ispersion of A ir P ollutants and their P enetration into the L ocal E nvironment EPSRC Infrastructure and Environment Programme The DAPPLE Consortium.

4. Atmospheric chemical transport models 4.1 Introduction 4.2 Box model 4.3 Three dimensional atmospheric chemical transport model.

M.K. Neophytou 1&2, D. Goussis 2, E. Mastorakos 1, R.E. Britter 1 1 University of Cambridge, Department of Engineering, Trumpington Street, Cambridge CB2.

Dispersion conditions in complex terrain - a case study of the January 2010 air pollution episode in Norway Viel Ødegaard Norwegian Meteorological.

COLPEX; Cold Air Pooling over Complex Terrain Bradley Jemmett-Smith 1 st year PhD RMets Conference 10 th July 2010.

CITES 2005, Novosibirsk Modeling and Simulation of Global Structure of Urban Boundary Layer Kurbatskiy A. F. Institute of Theoretical and Applied Mechanics.

PAG/ASG Meeting Monday, 14th July, 2003 University of Surrey 30BC03.

Investigating the typical occurrence of cold-air-pools during the COLd air Pool Experiment (COLPEX) Bradley Jemmett-Smith 15 th Conference of Mountain.

` Observations of Great Salt Lake Breezes During Salt Lake Valley Persistent Cold Air Pools Erik Crosman, John Horel, Neil Lareau, and Xia Dong University.

DAPPLEDAPPLE Summary – 09/12/02 Introductory Review and Questions following morning presentations Discussions - Met, Tracer Release, Traffic Future Meetings:

The Consortium University of Surrey, Alan Robins Imperial College, Roy Colvile, Helen ApSimon, Mark Nieuwenhuijsen; APRIL Network University of Bristol,

Pollution Variability at an Urban Junction Tom Bentham, Roy Colvile, Chris Pain & Alan Robins Levels of urban air pollution are usually quantified in terms.

Validation of urbanSTREAM Using JU2003 CRTI RD Project Review Meeting Canadian Meteorological Centre August 22-23, 2006.

DAPPLE Science Meeting 30 th November 2004 Department of Environmental Science & Technology Imperial College London, UK EXPOSURE ASSESSMENT S Kaur, M Nieuwenhuijsen,

Questions to be addressed in Urban Meteorology Stephen Belcher, Janet Barlow Dept of Meteorology University of Reading.

DAPPLE wind tunnel studies Hong Cheng Tom Lawton Paul Hayden Sandro Baldi Matteo Carpentieri Alan Robins.

SOURCES emissions Atmospheric dispersion RECEPTORS exposure Abatement options & costs Exceedance of criteria for protection Integrated Assessment of effective.

Observations of cold air pooling in a narrow mountain valley Allison Charland, Craig Clements, Daisuke Seto Department of Meteorology and Climate Science.

Exposure to air pollution in the transport microenvironment: how important is short-term exposure to high concentrations, and what are the determinants.

D ispersion of A ir P ollutants & their P enetration into the L ocal E nvironment EPSRC Infrastructure & Environment Programme DAPPLE TAKE 2 19 th April.

Evaluating a three-beam lidar wind-profiling method in urban areas

EXPOSURE OF CHILDREN TO ULTRAFINE PARTICLES AROUND AN URBAN INTERSECTION S Kaur, M J Nieuwenhuijsen & R Colvile Environmental Processes & Systems Research.

Surbjit Kaur, Mark Nieuwenhuijsen & Roy Colvile

Performance of a new urban land-surface scheme in an operational mesoscale model for flow and dispersion Ashok Luhar, Marcus Thatcher, Peter Hurley Centre.

Wind and Weather Data and Preliminary Results

DAPPLE Dispersion of Air Pollutants and Penetration into the Local

Inter-Relations within DAPPLE - The Determinants for Exposure

Case study of an urban heat island in London, UK: Comparison between observations and a high resolution numerical weather prediction model Siân Lane, Janet.

Exposure to Air Pollution James Tate and Paul Seakins

A New Method for Evaluating Regional Air Quality Forecasts

Ian D. Longley, M.W. Gallagher

The Turbulent Structure of the Urban Boundary Layer

RMetS Atmospheric Science Conference 2018 Lewis Blunn

Presentation transcript:

DAPPLE Science Meeting Tuesday 30 th November 2004, Imperial College London. Air Flow – Fieldwork: Sam Arnold (1&2), Adrian Dobre (2), Rob Smalley (3), Janet Barlow (2), Stephen Belcher (2), Doug Boddy (3), Ian Harman (2), Jethro Redmore (3) & Alison Tomlin (3). (1) Imperial College London, (2) University of Reading, (3) ERRI, University of Leeds. Supported by data from: The Met Office & QinetiQ

DAPPLE Science Meeting Tuesday 30th November 2004, Imperial College London. Objectives: To investigate: the relationship between street level (constrained) and rooftop winds; how the horizontal advection compares with the vertical mixing in urban envs; the turbulent fluxes and mean flows across the intersection in the centre of the road; vertical turbulent fluxes; more comprehensively the characteristics of the above-roof winds; ground level flows with mobile sonics in 2004 only – to provide support for exposure and tracer tracer releases. Key: Both, 2003 only, 2004 only.

DAPPLE Science Meeting Tuesday 30th November 2004, Imperial College London. DAPPLE 2003: Existing Analysis Papers: Arnold et al (2004) – Introduction to the DAPPLE project – STOTEN, 332, ; Dobre et al (2004) - Flow field measurements in the proximity of an urban intersection in London, UK– to be submitted to Atmospheric Environment ASAP; Main Conference Presentations: 5-th Conference on Urban Env., Vancouver - Aug 2004 Clean Air Congress – Aug 2004 UWERN – Dec 2004

Roof-top conditions DAPPLE Science Meeting Tuesday 30th November 2004, Imperial College London. Pdf of the roof-top wind direction Sector mean wind speeds θ Marylebone Rd

DAPPLE Science Meeting Tuesday 30th November 2004, Imperial College London. Horizontal flow patterns NW roof-top windsSW roof-top winds Switching Channeling Apparent mirroring  Pdf of wind directions based analysis

DAPPLE Science Meeting Tuesday 30th November 2004, Imperial College London. Decomposition model Helical effect Axial advection Recirculation U rt V rt u v θ rt θ

DAPPLE Science Meeting Tuesday 30th November 2004, Imperial College London. Decomposition Model Roof-top wind component parallel to the street, U rt In-street axial wind component, u V rt sqrt(v 2 +w 2 ) R 2 =0.78 R 2 =0.39

DAPPLE Science Meeting Tuesday 30th November 2004, Imperial College London. Hall Farm measurements Aim: To investigate the mechanisms responsible for venting urban street canyons To measure detrainment and subsequent re- entrainment PMCPPMCH SF 6 3.2m 1m

DAPPLE Science Meeting Tuesday 30th November 2004, Imperial College London. DAPPLE 2004: Preliminary Analysis Data check: total of 53 days of roof-top measurements, 43 days of BT tower, 22 days of street level data. Initial data post-processing: Time stamped files with raw data and 10minute averages for the whole campaign; also 1 minute averages for the 3 “special days”: DUST release and 2 TRACER releases

DAPPLE Science Meeting Tuesday 30th November 2004, Imperial College London. Synoptic conditions wind direction wind speed max 2.5m/s at roof-top! BT tower: 180 m θ Marylebone Rd 10 min averages

DAPPLE Science Meeting Tuesday 30th November 2004, Imperial College London. DAPPLE 2: In-street winds

DAPPLE 2: Site 1 180º N 250 º 90º 0º0º 270 º 180º DAPPLE Science Meeting Tuesday 30th November 2004, Imperial College London.

Site 1: variation with height -60 º -10º 225 º lower: 4.1 mupper: 8.3 m 90º 0º0º 270 º 180º DAPPLE Science Meeting Tuesday 30th November 2004, Imperial College London.

DAPPLE 2: Site 2 210º 160 º lower: 4.4 mupper: 8.1 m 90º 0º0º 270 º 180º DAPPLE Science Meeting Tuesday 30th November 2004, Imperial College London.

DAPPLE 2: Site 3 225º 90º 0º0º 270 º 180º DAPPLE Science Meeting Tuesday 30th November 2004, Imperial College London.

DAPPLE 2: Site 4 DAPPLE Science Meeting Tuesday 30th November 2004, Imperial College London. significant “apparent reflection”

Sites 1 – 4: analysis An effective above-roof reference needs to be selected Variation of mean flow and turbulence with height (4.0 < H (m) < 8.5): - significant within the intersection (site 1) -minimal within the canyon and on the intersection boundary (site 2) Turbulence intensity relatively high (~250%) Turbulence measured is more isotropic compared with data from the building edge. (To present at UWERN December 2004, with York data) Application to pollutant dispersion: The influence of air flow regimes on the concentration of a traffic related pollutant in the vicinity of a complex urban intersection (submitted as a presentation at UAQ5, March 2005) DAPPLE Science Meeting Tuesday 30th November 2004, Imperial College London.

Unifying Themes 1 Helical mean flow in streets 1.Sensitivity to above roof wind direction 2.DAPPLE II: 1.Tool for understanding tracer release? 2 Intermittency 1.Definition: Intermittent excursions from mean 2.Flow switching at intersections as mechanism 3.DAPPLE II: 1.Vertical coherence of switching 3 Neighbourhood preconditioning 1.Upstream and downstream neighbourhood flow 2.DAPPLE II: 1.Use different synoptic wind directions 2.Which above roof wind for reference?