User:Milton Beychok/Sandbox2: Difference between revisions
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==Model description== | ==Model description== | ||
DISPERSION21 is intended as a tool for calculating air pollutant concentrations originating from industrial or urban air pollutant sources. The model is used in studies to evaluate effects on air quality from existing or planned sources. It is a local-scale [[Air pollution dispersion terminology|Gaussian model]] including [[Air pollution dispersion terminology|plume rise]] and [[Air pollution dispersion terminology|building wake effects]]. A street canyon component with NOx-chemistry is included.<ref name=MDS/> | DISPERSION21 is intended as a tool for calculating air pollutant concentrations originating from industrial or urban air pollutant sources. The model is used in studies to evaluate effects on air quality from existing or planned sources. It is a local-scale [[Air pollution dispersion terminology|Gaussian model]] including [[Air pollution dispersion terminology|plume rise]] and [[Air pollution dispersion terminology|building wake effects]]. A street canyon component with [[NOx|NOx-chemistry]] is included.<ref name=MDS/> | ||
Some of the specific features and capabilities of DISPLAY21 are: <ref name=MDS/> | Some of the specific features and capabilities of DISPLAY21 are: <ref name=MDS/> | ||
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*Source locations: [[Air pollution dispersion terminology|Urban or rural locations]]. | *Source locations: [[Air pollution dispersion terminology|Urban or rural locations]]. | ||
*Plume types: [[Air pollution dispersion terminology|Continuous or intermittent]] [[Air pollution dispersion terminology|buoyant plumes]] | *Plume types: [[Air pollution dispersion terminology|Continuous or intermittent]] [[Air pollution dispersion terminology|buoyant plumes]] | ||
*[[Atmospheric dispersion modeling|Plume dispersion]] treatment: [[Air pollution dispersion terminology|Gaussian model]] treatment using [[Green's function]]s and includes multiple reflections. | *[[Atmospheric dispersion modeling|Plume dispersion]] treatment: [[Air pollution dispersion terminology|Gaussian model]] treatment using [[Green's function]]s and includes [[Air pollution dispersion terminology|multiple reflections]]. | ||
*Terrain types: Simple terrain with no more than 10 degree slopes. | *Terrain types: Simple terrain with no more than 10 degree slopes. | ||
*Building effects: [[Air pollution dispersion terminology|Building downwash]] algorithms are included. | *Building effects: [[Air pollution dispersion terminology|Building downwash]] algorithms are included. | ||
Revision as of 13:36, 28 May 2011
DISPERSION21 (also called DISPERSION 2.1) is a local scale air pollution dispersion model[1][2][3] developed by the air quality research unit at SMHI, the Swedish Meteorological and Hydrological Institute, located in Norrköping.[4][5]
The model is widely used in Sweden by local and regional environmental agencies, various industrial users, consultant services offered by SMHI and for educational purposes.
Model description
DISPERSION21 is intended as a tool for calculating air pollutant concentrations originating from industrial or urban air pollutant sources. The model is used in studies to evaluate effects on air quality from existing or planned sources. It is a local-scale Gaussian model including plume rise and building wake effects. A street canyon component with NOx-chemistry is included.[6]
Some of the specific features and capabilities of DISPLAY21 are: [6]
- Source types: Multiple point, area , and volume sources as well as street canyons.
- Source releases: Surface, near surface and elevated sources.
- Source locations: Urban or rural locations.
- Plume types: Continuous or intermittent buoyant plumes
- Plume dispersion treatment: Gaussian model treatment using Green's functions and includes multiple reflections.
- Terrain types: Simple terrain with no more than 10 degree slopes.
- Building effects: Building downwash algorithms are included.
- Meteorological data: The model includes a preprocessor to produce the meteorological parameters needed to characterize the atmospheric turbulence as well as to produce wind speed and direction profiles.
- The street canyon module includes some atmospheric chemistry for photochemical reactions.
References
- ↑ D.B. Turner (1994). Workbook of Atmospheric Dispersion Estimates, 2nd Edition. CRC Press. ISBN 1-56670-023-X. www.crcpress.com
- ↑ Karl B. Schnelle and Partha R. Dey (2000). Atmospheric Dispersion Modeling Compliance Guide, 1st Edition. McGraw-Hill Professional. ISBN 0-07-058059-6. Available online at Google Books
- ↑ Beychok, Milton R. (2005). Fundamentals of Stack Gas Dispersion, 4th Edition. author-published. ISBN 0-9644588-0-2. www.air-dispersion.com
- ↑ Air Quality Research staff and contacts From the SMHI website
- ↑ G. Omstedt (1988), An operational air pollution model, SMH Report RMK 57
- ↑ Jump up to: 6.0 6.1 MDS - Model Documentation System From the website of the European Environment Information and Observation Network (EIONET)