Models in
AirQUIS
 In
the modern multi modular environmental information system
like AirQUIS steps have been taken to establish models for
air pollution dispersion to enable environmental impact
assessment estimates. Models are essential when the
programmes are to be used for planning purposes. The models
need as input data some background information on:
-
Source characteristics and emission data
-
Area characteristics (surface roughness,
topography etc.)
-
Measurement data (measurement type,
heights etc.)
-
Meteorological data (wind, stability,
mixing height, temperatures etc.)
-
Dispersion coefficients (type to be used
and parameters)
-
Dry and wet removal coefficients
-
Location of receptor points (distances
or grid specifications)
A Eulerian type numerical dispersion model is the EPISODE
model developed by NILU. It represents the most applied
model in AirQUIS today. This is a time-dependent finite
difference model normally operating in three vertical
levels, combined with a sub grid line source model for
traffic and a puff trajectory model for industry stations to
account for subgrid effects close to individual sources. The
wind field used as input to the model may be homogeneous or
inhomogeneous for each time step dependent upon the
meteorological input data available.
The modelling modules of AirQUIS include:
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