Noise and Air Quality Impact Assessment W D Milligan 31 July 2014

                                                                         MWA Environmental




3.3 DESCRIPTION OF ODOUR MODEL
    3.3.1 METEOROLOGICAL DATA

    No site-specific meteorological data was available for this assessment. In the
    absence of site-specific data, following the conventional methodology for
    assessment, the TAPM software was utilised to develop a prognostic
    meteorological model which generated a year of representative hourly
    meteorological data for the subject site. The Year 2008 was selected as a year
    relatively consistent with long-term meteorological trends.

    A brief analysis of the Year 2008 compared to long-term average conditions at
    the nearest Bureau of Meteorology station (Tewantin) is provided in
    Attachment 5.

    The analysis indicates that the Year 2008 is sufficiently representative of long-
    term trends to be applied for the purpose of this assessment. There are
    variations in the frequency of winds from various directions and speeds as
    compared to long-term averages but these are evident for any year when
    compared to long-term averages. The odour objective being assessed relates to
    the 44th ‘worst’ 1 hour periods of each year for each receptor location. The ‘worst’
    conditions for odour dispersion are typically associated with lower (less than 3
    metre per second) wind speed conditions. The analysis indicates that wind
    speeds during 2008 were lower than long-term averages and thus may be
    considered a conservative year in this regard.

    Observed wind speeds and wind directions for the Bureau of Meteorology (BoM)
    stations at Tewantin and Nambour were incorporated into the TAPM model as
    assimilation data. Considering topographical influences, Nambour was given a
    radius of influence of 5km over 2 vertical levels and Tewantin given a radius of
    influence of 15km over 2 vertical levels.

    TAPM has been used to predict meteorological parameters specific to the area
    surrounding the subject site including temperature, wind speed, wind direction
    and stability classification.      The model accesses databases of surface
    characteristics (terrain height, soil and vegetation) and synoptic weather analyses
    provided by CSIRO to carry out these analyses. TAPM is able to process the
    output data to produce input meteorology files suitable for input to the CALMET /
    CALPUFF modelling system i.e. hourly predictions of meteorological parameters
    over a full year and generation of surface, upper air and geophysical data files.

    Technical discussion of the model algorithms, inputs and model validation studies
    are provided in the Part 1: Technical Paper (Hurley, 2002) and Part 2: Summary
    of Verification Studies (Hurley et al, 2002)4,5.




4 Hurley, P.J. (2002) The Air Pollution Model (TAPM) Version 2: User Manual. Aspendale: CSIRO
Atmospheric Research Internal Paper.
5 Hurley, P.J. (2002) The Air Pollution Model (TAPM) Version 2: Part 1: Technical Description.
Aspendale: CSIRO Atmospheric Research Technical Paper.


Ridgewood 12-002                              15                                 31 July 2014