CERC - ADMS-Airport - Air Pollution Modelling Software

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CERC - ADMS-Airport - Air Pollution Modelling Software

ADMS-Airport is a comprehensive tool for managing air quality at airports. It is an extension of the ADMS-Urban model, designed to model the concentration of pollutants at airports in rural or complex urban environments.

Who Uses ADMS-Airport?

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ADMS-Airport has been used to model air quality at London's Heathrow airport for the 2002 base case and future year scenarios as part of the Department for Transport's (DfT) Project for Sustainable Development of Heathrow (PSDH)—Adding Capacity at Heathrow1.

This followed the PSDH Model Inter-comparison Study and the recommendations of the DfT's expert panel on modelling which was in 'full agreement in the recommendation of the CERC model ADMS-Airport for future modelling work at Heathrow'.

ADMS-Airport is also one of the participating models in the International Civil Aviation Organisation, Committee on Aviation Environmental Protection (ICAO CAEP) model exercises.

Why use ADMS-Airport?

ADMS-Airport incorporates all the features of ADMS-Urban plus it is able to incorporate sources specific to an airport. ADMS-Airport is able to take into account the whole range of relevant emission sources: aircraft traffic, auxiliary power units, ground support equipment, road traffic, industrial, commercial, domestic and other less well-defined sources.

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:

  • Visualisation : ADMS-Airport has links to ArcGIS and MapInfo Professional 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 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.

ABOUT ADMS-Airport

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.

Why Use ADMS-Airport?

ADMS-Airport incorporates all the features of ADMS-Urban plus it is able to incorporate sources specific to an airport. ADMS-Airport is able to take into account the whole range of relevant emission sources: aircraft traffic, auxiliary power units, ground support equipment, road traffic, industrial, commercial, domestic and other less well-defined sources.

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:

Visualisation : ADMS-Airport has links to ArcGIS and MapInfo Professional 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 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.

Support Details

ADMS-Airport is supplied with a User Guide that details user inputs and outputs specific to ADMS-Airport and the modelling of airport emissions inventories in EMIT. It includes a number of step-by-step worked examples. An annual maintenance contract provides support for users; this includes:
  • 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.

ADMS Jet Module

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.

Hourly Profiles

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 500 diurnal and 500 monthly profiles plus wind direction dependence for any source.

1 See C. McHugh, M. Williams, C. Price and C. Lad,2007:Air quality studies for Heathrow: base case, segreated mode, mixed mode and third runway scenarios modelled using ADMS-Airport.

Model Options

One of the most important advanced modules in ADMS-Airport is the chemistry module. The following options are available:

  • NOx – NO2 chemistry
  • The Trajectory model
  • Sulphate chemistry

Other advanced modules are:

  • Street canyons
  • Buildings

These modules are based on the latest understanding of the way these features affect the movement of airflow around the sources, and all have been shown to have considerable affect on observed concentrations.

Chemistry Module NOx – NO2 chemistry

ADMS-Airport models NOx chemistry using the 8 reaction Generic Reaction Set (Venkatram et al., 1994) that includes reactions with ozone and hydrocarbons.

In most urban areas, the dominant pollution source is road traffic, and the pollutants usually of major interest are NOx and PM10. The NOx chemical reactions take place over a relatively short time period and in order to get accurate predictions of NO2 concentrations, NOx chemistry should be taken into account. The Generic Reaction Set predicts changes in ozone concentrations that are also of interest.

The Trajectory Model

A simple Lagrangian Trajectory Model is used to calculate background concentrations for the air approaching the main modelling area. This model includes the effects of emissions, chemistry, deposition and ozone entrainment.

By nesting the main model domain within a larger domain, such as a large urban conurbation, the Trajectory Model calculates a spatially varying background ambient concentration that takes into account the chemical reactions and processes occurring over the larger domain.

Sulphate Chemistry

The reactions between SO2 and other compounds in the air to produce particulates are based on those used in the EMEP model (Tsyro, 2001).

These reactions have a significant effect on the concentrations of particulates in areas where there are a large number of industrial sources emitting SO2 or downwind from a large emitter of SO2.

Street Canyons

This module is based on the Danish Operational Street Pollution Model (OSPM, Hertel and Berkowicz, 1990, Hertel et al., 1990).

Buildings

Users can include the effect of up to 10 dominant buildings on point source emissions. ADMS-Airport creates an effective building for each point source from the user-defined buildings and models the re-circulating flow in the lee of the building, the cavity region, as well as the building main wake.

Cambridge Environmental Research Consultants (CERC)
Cambridge Environmental Research Consultants (CERC)
3 King`s Parade
Cambridge , Cambridgeshire; CB2 1SJ

APPLICATIONS

Air quality management at airport consultancy

We provide consultancy on aviation and air quality, such as dispersion modelling and emissions inventory compilation for environmental impact assessment at airports. We also conduct research into aviation.

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