ADMS - Airport

2002 base case, modelled NO2 concentrations in µg/m3 around Heathrow, taken from
“Adding Capacity at Heathrow Airport – Air Quality Studies for Heathrow” (2007)

ADMS-Airport air quality model is a comprehensive tool for managing air quality at airports. It can be used to examine emissions from 6500 sources simultaneously, including:

Aircraft Jet Sources
Up to 500 aircraft jet sources

Road Traffic
Over 145,000 road links (3000 road sources each with up to 50 vertices)

Industrial Sources
Up to 1500 point, line, area or volume sources

Aggregated Sources (grid source)
Up to 3000 grid cells can be used to model emissions from sources that are too small to define explicitly, for example, emissions from domestic housing.

ADMS-Airport makes use of the ADMS jet model to calculate the impact of aircraft exhausts. The jet model calculates an integral solution to the equations of conservation of mass, momentum, heat and species, capturing the effect of the movement of the jet engine source in reducing the effective buoyancy of the exhaust. This is particularly important in capturing the near field dispersion from the high momentum, buoyant take-off ground roll sources.

To model the airport’s flight schedule in detail users can construct up to 500 annual hourly profiles. These detailed schedules can also be used for detailed modelling of non-airport sources, such as the effect of school terms and public holidays on road traffic. For less detailed time dependent modelling ADMS-Airport allows up to 50 diurnal and 50 monthly profiles plus wind direction dependence for any source.

ADMS-Airport and EMIT (CERC's Emissions Inventory Toolkit) have been developed with a number of features to simplify the modelling process and help users. For example:

GIS
ADMS-Airport has links to ArcGIS 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 (in EMIT)
Issue 15 of the ICAO emission factors (released July 2007) can be used to calculate emissions from the thrust setting, time in mode and the number of landing-take-off cycles. FAA emission factors can be used to calculate APU emissions from the operation time. Emission factors derived from EC Non Road Mobile Machinery (EC directive 97/68/EC) limit values can be used to calculate GSE emissions from the operation time.The latest UK DMRB emission factors (released February 2003) can be used to calculate emissions from traffic flows and speeds.

Intelligent gridding
ADMS-Airport includes an intelligent gridding option which places extra output points in and adjacent to aircraft jet sources and road sources to give excellent spatial resolution in areas of particular interest.

User-defined outputs
The user defines the pollutant and averaging time which may be an annual average or a shorter period, and also which percentiles and exceedence values to calculate, and whether a rolling average is required or not. 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.

• maintenance model upgrades,
• use of the ‘Helpdesk’ by email, phone, fax or post,
• attendance at the annual User Group meetings,
• 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.