Appendix 6. Odour Buffer Assessment [As Published] · 132007.2399

                                                                                                       [10]
              Odour Buffer Assessment
              StarCo Developments


4.2 Selected Models and Methodology

The CALMET and CALPUFF models substantially overcome the basic limitations of the steady-state
Gaussian plume models. CALMET, the meteorological pre-processor for the dispersion model
CALPUFF, calculates three-dimensional meteorological data based upon observed ground and upper
level meteorological data, as well as modelled data generated for example by TAPM. CALPUFF then
calculates the dispersion of plumes within this three-dimensional meteorological field (Figure 4.1).

The air dispersion modelling conducted for this assessment has been based on the modelling
approach outlined above, which utilises the TAPM and CALMET/CALPUFF models. The following
sections describe these models.



                                                                    Gridded mesoscale
                      Meteorological data                           meteorological data
                      generation (gridded)
                             TAPM
                                                                    Land use and topography




                  Downscaled meteorological                         Land use and topography
                   data generation (gridded)
                           CALMET                                   Observational meteorological
                                                                    data (upper air and surface)




                                                                    Emission rates
            Puff dispersion model to simulate hourly
                     dispersion of pollutants                       Source characteristics
                            CALPUFF                                 Complex terrain
                                                                    (e.g. hills close to the source)




               Gridded pollution concentration
                     data over modelled
                     domain for different
                      averaging times




                        Figure 4.1: Modelling methodology utilised in the study.



4.3 TAPM

The Air Pollution Model, or TAPM, is a three dimensional meteorological and air pollution model
developed by the CSIRO Division of Atmospheric Research. Detailed description of the TAPM model
and its performance is provided elsewhere, (Hurley, 2002a, 2002b; Hurley et al., 2002a, 2002b;
Hibberd et al., 2003; Luhar & Hurley, 2003).




1898a report final.doc                                                        PAE Job Number 1898a