The ADMS 3 (Atmospheric Dispersion Modelling System) is an advanced atmospheric pollution dispersion model for calculating concentrations of atmospheric pollutants emitted both continuously from point, line, volume and area sources, or intermittently from point sources. [ [ US Environmental Protection Agency "SCRAM" website] ] It was developed by Cambridge Environmental Research Consultants (CERC) of the UK in collaboration with the UK Meteorological Office, National Power plc (now INNOGY Holdings plc) and the University of Surrey. The first version of ADMS was released in 1993. The current version 3 was released in February 1999 and runs only in the Microsoft Windows environment even though it still has a FORTRAN codebase. Version 4 is scheduled for release this summer with added features. [ The CERC web site pages about ADMS 3] ]

Features and capabilities of the ADMS 3

The model includes algorithms which take into account: downwash effects of nearby buildings within the path of the dispersing pollution plume; effects of complex terrain; effects of coastline locations; wet deposition, gravitational settling and dry deposition; short term fluctuations in pollutant concentration; chemical reactions; radioactive decay and gamma-dose; pollution plume rise as a function of distance; jets and directional releases; averaging time ranging from very short to annual; and condensed plume visibility. The system also includes a meteorological data input preprocessor.

The model is capable of simulating passive or buoyant continuous plumes as well as short duration puff releases. It characterizes the atmospheric turbulence by two parameters, the boundary layer depth and the Monin-Obukhov length, rather the single parameter Pasquill class.

ADMS 3 can simultaneously model up to 100 emission sources, of which:

* up to 100 may be point or jet sources
* up to 6 may be line, area or volume sources
* 1 may be a line source

The performance of the model has been evaluated against various measured dispersion data sets. [Hanna, Steven R et al (2201), "Evaluation of the ADMS, AERMOD, and ISC3 dispersion models with the OPTEX, Duke Forest, Kincaid, Indianapolis and Lovett field data sets", International Journal of Environment and Pollution, Volume 16, Numbers 1-6, pp 301-314. [,27,55;journal,39,58;linkingpublicationresults,1:110851,1 Inderscience Publishers] ]

Users of the ADMS 3

The users of ADMS 3 include:

* Governmental regulatory authorities including the UK Health and Safety Executive (HSE)
* Environment Agency of England and Wales
* Over 130 individual company licence holders in the UK
* Scottish Environmental Protection Agency (SEPA) in Scotland
* Environment and Heritage Service in Northern Ireland
* Governmental organisations including the Food Standards Agency (UK)
* Users in other European countries, Asia, Australia and the Middle East
* Accepted by the US Environmental Protection Agency as an "Alternative" model


ee also

* Compilation of atmospheric dispersion models
* UK Dispersion Modelling Bureau
* UK Atmospheric Dispersion Modelling Liaison Committee

Further reading

For those who are unfamiliar with air pollution dispersion modelling and would like to learn more about the subject, it is suggested that either one of the following books be read:

*cite book | author=Turner, D.B. | title=Workbook of atmospheric dispersion estimates: an introduction to dispersion modeling| edition=2nd Edition| publisher=CRC Press | year=1994 | id=ISBN 1-56670-023-X []
*cite book | author=Beychok, M.R. | title=Fundamentals Of Stack Gas Dispersion| edition=4th Edition| publisher=self-published | year=2005 | id=ISBN 0-9644588-0-2 []

External links

* [ Model Documentation System] (Topic Centre of European Environment Agency)
* [ ADMS 3 Validation Summary]

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