Appendix 5 - Air quality assessment report

that a TAPM only run was considered initially however, calms were not accurately represented by the
model (under-predicted significantly). Therefore, observational data has also been considered in
conjunction with TAPM data as discussed in Section 4.2.3.4.

The 3D prognostic data was derived using TAPM (Version 4.05). The model was configured with a
series of nested grids chosen to provide an appropriate communication and transfer of information
from the broad synoptic to the local scale. The model was configured to use a domain consisting of
25 x 25 x 25 grid points with nesting spacings of 30 km, 10 km, 3 km and 1 km. Table 4.1 presents a
summary of the TAPM settings.

Table 4.1 - TAPM Settings
                   Setting/Input                                                          Value
                 Latitude, Longitude                                               26°24', 153°4'
              Easting X, Northing Y (m)                                          506834, 7079975
                        Date                                                               2014
                     Grid Points                                                         25 x 25
                 Outer Grid Spacing                                                30 km x 30 km
                 Vertical Grid Levels                                     25 grid levels
                                                      10, 25, 50, 100, 150, 200, 250, 300, 400, 500, 600,
                                                     750, 1000, 1250, 1500, 1750, 2000, 2500, 3000, 3500,
                                                                 4000, 5000, 6000, 7000, 8000
                                                                   All levels stored in output
              Number of Grid Domains                                    4 (30 km, 10 km, 3 km, 1 km)




4.2.3      CALMET
4.2.3.1    Overview
As discussed in the previous section, a three dimensional prognostic data set derived from the TAPM
model was input to CALMET to predict meteorological conditions at the development and
surrounding area. The following sections provide an overview of the data utilised in the CALMET
modelling, along with details of some of the key parameters selected to establish calculation limits
within CALMET.

4.2.3.2    Vertical Stations
For the purposes of the modelling, CALMET was initialised with a total of 10 vertical layers with layer
boundaries at 20 m, 40 m, 80 m, 160 m, 320 m, 640 m, 1,200 m, 2,000 m, 3,000 m and 4,000 m
respectively. The vertical levels used in the modelling were selected to provide the model with the
ability to predict atmospheric conditions at a range of heights. A greater resolution of vertical heights
has been adopted nearer to the ground, given the ground level sources considered in the
assessment.

4.2.3.3    Terrain And Land Use Data
Terrain data for the area surrounding the development was obtained from the Digital Elevation Model



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