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Air Pollution Calculation

CadnaA with Option APL allows calculation, assessment and presentation of air pollutant distribution.
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You are here: Products > CadnaA > Extensions > APL - Air Pollutants > Calculation using AUSTAL2000

Calculation using AUSTAL2000 Model

Option APL combines the user-friendly interface of CadnaA with the dispersion model AUSTAL2000 developed by the German Environmental Protection Agency (UBA - Umweltbundesamt). The implemented Lagrange particle model considers time-dependent emissions from road and industrial sources, variable wind fields and atmospheric stability and takes terrain and buildings into account. Furthermore, with Option APL evaluation of the load by air pollutants at certain monitoring points (entered as receivers) is possible. For each AUSTAL2000 calculation area up to 10 monitoring points are possible.

Calculation Settings

  • Pollutant
  • Interval (year, day, hour)
  • Type (maximum, mean value)
  • Quality Level qs (-4 to 4)
  • Grid Overlap (m)
  • Roughness Length z0 (m)
  • Anemometer Height (m)
  • Anemometer Location (m)
  • Meteo-File (*.akt or *.akterm)
  • Include DTM
  • Include Buildings
  • Number of empty border cells
  • Delete old wind-field files (LIB)1
  • Overwrite old time-series file2
  • Reference year (for road emissions)

1The option "Delete old wind-filed files (LIB)" enables to restart a calculation with altered emission data without having to recalculate all wind field files. In many cases, this reduces calculation time considerably.
2The option "Overwrite old time-series file" enables to use externally generated time-series files. This is quite useful when having industrial sources with emission not constant during the year. With this option being deactivated the existing time series will remain.
 

 Calculation settings within Option APL
 Emission time series for road traffic calculated on the basis of HBEFA

Emission Factors for Road Traffic

The emission factors for road traffic applied by default in Option APL result from a joined publication by the German, Swiss, and Austrian Environmental Protection Agencies (HBEFA Handbuch Emissionsfaktoren des Strassenverkehrs 2.1 - Manual for Emissions Factors of Road Traffic, February 2004). The emission of a road section depends on the emission factors, the mean daily traffic densities (MDTD), the percentage of heavy vehicles, the average speed, and the reference year. The average speed relevant for air pollution can be introduced by a text variable on the Memo-Window.

Alternatively, individual emission time series for specific scenarios can be entered or pasted via the clipboard.