The AUSTAL program system calculates the dispersion of pollutants and odorous substances in the atmosphere. It is an implementation of the appendix “Dispersion calculation” of TA Luft1. The model on which the program is based is described in the guideline VDI 3945 Part 3.

Executable programs are available for Windows and for Linux (32-bit programs) including the source code (see: www.umweltbundesamt.de). The programs have been developed and tested under Windows (10/7/Vista/XP) and Linux (SUSE 11 and Ubuntu 10).

We use the user-friendly WinAUSTAL user interface to create and visualize the AUSTAL input file and to display the calculation results graphically. WinAUSTAL enables the user to quickly and conveniently analyze plants and projects with regard to the dispersion of air pollutants in accordance with the amended TA Luft and the Odor Immission Directive (GIRL).

The following aspects are realized in AUSTAL:

  • Time series calculation
  • Statistical calculation
  • All substances for which immission values are specified
  • Point, line, area and volume sources
  • Any number of sources
  • Plume rise (according to VDI 3782 Sheet 3, VDI 3784 Sheet 2 or explicitly)
  • Conversion of NO to NO2 (according to VDI 3782 Sheet 1)
  • Deposition
  • Sedimenting dusts
  • Determination of odor hours according to GIRL
  • Evaluated odorous substances
  • Time-dependent emission parameters
  • Situation-dependent emission parameters
  • Estimation of statistical uncertainty
  • Automatic determination of the calculation network
  • Automatic calculation of z0
  • Meteorological time series (AKTerm) in DWD format
  • Transfer of the anemometer height from the AKTerm of the DWD
  • Calculation for a grid of receptor points
  • Calculation of the time series of the additional pollution for assessment points
  • Calculation of the immission parameters of the additional load
  • Calculation of the immission parameters of the total load from time series
  • Divided terrain
  • Flow around buildings
  • Specification of buildings as cuboids, cylinders or in the form of a raster file
  • Automatic definition of nested grids for flow around buildings
  • Verification in accordance with VDI 3945 Sheet 3.

The calculation of the three-dimensional wind fields for calculations in structured terrain or with buildings is carried out with the diagnostic wind field model TALdia2. The VDISP program is required to calculate the plume rise in accordance with the VDI 3784 Part 2 guideline “Dispersion calculation for exhaust gas discharge via cooling towers”.

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1 See https://www.bmu.de/gesetz/erste-allgemeine-verwaltungsvorschrift-zum-bundes-immissionsschutzgesetz/.

2 “Further development of a diagnostic wind field model for plant-related immission control (TA Luft)”, Federal Environment Agency Berlin, funding reference 203 43 256.

 

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