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WHO USES ADMS-Urban?
ADMS-Urban is used across the world for air quality management and assessment
studies of complex situations in towns, cities, motorways, counties
and large industrial areas. It is currently being used in cities across
Europe and Asia, including China,
and also the USA to compare pollution levels with relevant
air quality standards. Here in the UK, over 70 local
authorities used the model to help with their first round of Review
and Assessment and in developing air pollution action plans and remedial
strategies.
ADMS-Urban is used to assess current and future air quality with respect
to the air quality standards such as the EU Air Quality Directive, UK
NAQS, US NAAQS, Chinese Class I, II and III and WHO guidelines. It is
used to model the impact of major developments such as the Beijing Olympic
Village, airport expansion and traffic management schemes.
DEFRA (UK Department for the Environment) has contracted
CERC to use ADMS-Urban to model air pollutants in a number of urban
areas in the UK (DEFRA project EPG 1/3/176), including London. The picture
below is a contour plot of London showing the annual average NO2 concentrations
predicted by ADMS-Urban for 2005. Areas shown in yellow, orange or red
are predicted to exceed the UK NAQS
targets.
ABOUT ADMS-Urban
ADMS-Urban pollution model is a comprehensive tool for tackling air
pollution problems in cities and towns. It can be used to examine
emissions from 6,000 sources simultaneously, including:
road traffic |
Over 70,000 roads links (1,500
road sources each with up to 50 vertices) |
industrial sources |
Up to 1,500 point, line, area or volume
sources |
aggregated sources (grid source) |
Up to 3,000 grid cells can be used to model
emissions from sources that are too small to define explicitly,
for example, emissions from domestic housing. |
WHY USE ADMS-Urban?
ADMS-Urban is distinctive in its ability to describe in detail what
happens on a range of scales, from the street scale to the city-wide
scale, taking into account the whole range of relevant emission sources:
traffic, industrial, commercial, domestic and other less well-defined
sources.
The science of ADMS-Urban is significantly more advanced than that
of most other air dispersion models (such as CALINE, ISC and R91)
in that it incorporates the latest understanding of the boundary layer
structure, and goes beyond the simplistic Pasquill-Gifford stability
categories method with explicit calculation of important parameters.
The model uses advanced algorithms for the height-dependence of wind
speed, turbulence and stability to produce improved predictions.
Predicting pollutant concentrations from an urban area is a complex
modelling problem. The diagram below shows some of the possible inputs
to and outputs from the model, and some of the modelling options available.
ADMS-Urban has been developed with a number of features
to simplify the modelling process and help users. For example:
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ADMS-Urban has links to ArcGIS, ArcView
and MapInfo GIS (Geographical Information System)
packages as well as Surfer contour plotting package.
The GIS link can be used to enter and display input data and display
output, usually as colour contour plots. |
Emissions Inventory |
Source and emissions data can be imported from a Microsoft
Access database created by the user or exported from
CERC’s Emissions Inventory Toolkit, EMIT.
EMIT contains current and future emission factors
including those for vehicles, industrial processes and fuel consumption. |
Emission factors |
The latest UK DMRB emission factors (released
February 2003) can be used to calculate emissions from traffic
flows and speeds. |
Intelligent gridding |
ADMS-Urban includes an intelligent gridding
option which places extra output points in and adjacent to road
sources to give excellent spatial resolution in areas of particular
interest. |
User-defined outputs |
The user defines the pollutant, the
averaging time (which may be an annual average
or a shorter period), any percentiles and exceedence
values that are of interest, and whether or not a rolling
average is required. The output options are designed
to be flexible to cater for the variety of air quality limits
which can vary from country to country and over time. |
SUPPORT DETAILS
ADMS-Urban is supplied with an in-depth User Guide that details all
user inputs and outputs, and includes a number of step-by-step worked
examples. An annual maintenance contract provides support for users;
this includes
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maintenance model upgrades,
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use of the ‘Helpdesk’ by email, phone, fax or post,
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attendance at the annual User Group meetings,
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ADMS-Urban News newsletter twice a year, and
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access to the password-protected User
Area
CERC also offer basic and advanced training. Please
call for the latest availability.
If you would like more information on the model, please contact
us. The following pages describe the model
inputs, outputs and advanced
options with details of model validation, and finally some examples
of the model’s user interface.
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