Transcript Document 7604992

ispersion
of
ir
ollution &
enetration
into the
DAPPLE brings together a multidisciplinary research group that is capable of undertaking field, wind tunnel and computational simulations so as to
provide better understanding of the physical processes affecting street and neighbourhood scale flow and pollutant dispersion. The street canyon
intersection is the simplest case that includes sufficient complexity to demonstrate most of the factors that will apply in a wide range of urban situations.
The study will investigate the influence of roadside buildings on dispersion, the movement of vehicles on emissions variability, and interactions between
these. Conditions of moderate winds and slow-moving traffic will be used to assess the extent to which our understanding of the basic street-canyon
within DAPPLE - The Determinants for Exposure
intersection under typical dispersionInter-Relations
conditions
reveals principles that are applicable to other urban situations and more adverse weather conditions.
FIELD CAMPAIGNS
WINDTUNNEL & COMPUTATIONAL SIMULATIONS
Field measurements are being undertaken within a 250m radius of the
intersection of Marylebone Road and Gloucester Place intersection, Central
London (NW1). This region of Westminster is one of the most polluted
regions of the UK, where particulate and NOx levels frequently breach air
quality standards. Indeed the council was the first to declare and publish an
Air Quality Action Plan (& AQMA, 9th March, 1999).
Wind tunnel and numerical models will be used to reproduce the field site
at differing degrees of detail. Indeed, one question to be answered is how
much detail (e.g. box buildings > roof structures > window sills) is required
for results from simulated experiments to be representative.
The first campaign will occur between 29th April & 23rd May 2003. The
second campaign will be either Oct/Nov 2003 or April/May 2004
There are three elements to the field measurements:
• Meteorology (synoptic > city > neighbourhood > street canyon);
• Personal exposure/background pollution; and
• Tracer experiment.
X
At intersection looking
North along Gloucester
Place – one way N (left)
and AURN Super site on
Marylebone Road – dual
carriage way (below).
X
Strand/
Thames
Hyde Park
ocal
Transfers
between streets
Y
Transfers
over roofs
X
The wind tunnel experiments will be conducted at EnFlo, the
Environmental Flow Research Laboratory, University of Surrey (above).
A comprehensive range of numerical modeling, with contributions from
all of the collaborating Universities, will be undertaken with examples
ranging from ADMS urban (see right for colour coded – red = high, blue =
low - NOx plot for Westminster Council) to fully integrated LES codes.
LAT/LONG: N: 51:31:19 W:00:09:35
OS (WGS84): X = 052778 Y = 181927
Regents
Park
Marylebone Rd.
Wind
direction
Imperial
College
AIMS & INTER-RELATIONSHIPS
DAPPLE will examine the inter-relationships between pollution emissions,
dispersion amongst complex man-made ‘topography’ and the exposure of
people moving through the area using different means of transport to
answer important questions about urban air quality.
Dispersion
Synoptic
Meteorology
Buildings
Maps curtesy of CR World
(top) and Multimap (right), &
photos S Arnold & J Barlow.
X
Emissions
nvironment
A Consortium Research Project
funded by the UK EPSRC
Engineering for Health, Infrastructure
and the Environment Programme,
building on the research agendas
defined by the APRIL Network and
the EUROTRAC-2 SATURN Project.
Marylebone Road
looking E (top)
and Salisbury
Place looking W
at back of Council
Building (right).
Bickenhall St looking E
with Westminster Uni
tower (reference station)
in background (above)
and Gloucester Place
South looking N (left).
Movement
CONTACTS:
Alan Robins: [email protected]
Roy Colvile: [email protected]
Surbjit Kaur: [email protected]
Samantha Arnold: [email protected]
Web: http://vortex.mech.surrey.ac.uk/dapple