Appendix 5 - Air quality assessment report

To incorporate both TAPM prognostic data and measured data, CALMET was run in a hybrid mode
(NOOBS=1) which combines both data sets to produce a site specific windfield. The NOOBS = 1
setting also utilises TAPM outputs for upper air data, this setting was adopted as the nearest station
to monitor upper air data is located in Brisbane (110 km south of the site) and is not considered
representative of the site conditions. An R1 and RMAX1 value of 8 km and 12 km have been adopted
for the Tewantin RSL Park BOM Station.

4.2.4      CALPUFF Dispersion Modelling
The CALPUFF modelling system treats emissions as a series of puffs. These puffs are then dispersed
throughout the modelling area and allowed to grow and bend with spatial variations in meteorology.
In doing so, the model is able to retain a memory of the plume's movement throughout a single hour
and from one hour to the next while continuing to better approximate the effects of complex air
flows.

CALPUFF utilises the meteorological processing and prediction model CALMET to provide three
dimensional wind field predictions for the area of interest. The final wind field developed by the
model (for consideration by CALPUFF) includes an approximation of the effects of local topography,
the effects of varying surface temperatures (as is observed in land and sea bodies) and surface
roughness (resulting from varied land uses and vegetation cover in an area). The CALPUFF model is
able to resolve complex terrain influences on local wind fields including consideration of katabatic
flows and terrain blocking.

4.2.5      CALPOST
Post processing of modelled emissions is undertaken using the CALPOST package. This allows the
rigorous analysis of pollutant predictions generated by the CALPUFF system. In particular CALPOST is
able to provide an analysis of predicted pollutant concentrations for a range of averaging periods
from 1 hour to 1 year.



4.3        Meteorological Predictions
4.3.1      Wind Predictions
Predicted 2014 wind conditions have been compared to measured wind data (2012-2016) at the
Tewantin RSL Park Bureau of Meteorology Station (3 km north-west of the development site).
Figure 4.3 presents shows wind roses for the measured and predicted data.




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