2184Response_OM13_222

      SUMMARY OF MODEL UPDATES TO ADDRESS SCRC TECHNICAL REVIEW
            MATTERS RAISED BY PACIFIC ENVIRONMENT LTD (PEL)

TAPM

  •    Radius of influence of Nambour observation station set to 5km (as per PEL request)

CALMET

  •    updated to apply the MM5toGrads algorithm (ICOULD=4) as per request from PEL
       (per email 25 November 2013)
  •    updated the Radius of Influence of Terrain Features (TERRAD) from 2km to 5km to
       match the range of suitable values in accordance with the NSW CALPUFF Modelling
       Guidance Document

CALPUFF

  •    WSCALM was set to a value of 0.5m/s (as per PEL request)
  •    Model representation of poultry shed emissions amended to buoyant point sources
       (as per PEL request), specifically:
          o   16-16.5m source diameter offset 30m from the ventilation end of each shed
          o   Note momentum flux factor set to 0 (rain hat function)
          o   Effective emission velocity calculated for each hour based upon the
              ventilation rate
          o   Emission temperature set in accordance with the Best Practice Guidance for
              the Poultry Industry document
  •    Set the minimum turbulence velocities (SVMIN) set to 0.2 over land for each stability
       class in accordance with the NSW CALPUFF Modelling Guidance Document
  •    Set the Probability Density Function (PDF) used for dispersion under convective
       conditions to 1 in accordance with the NSW CALPUFF Modelling Guidance
       Document


       A sensitivity test was undertaken to evaluate the impact of changing SIGZI for 1.5m
       high litter stockpiles from 0.35 to 0.7 for ground level sources (as per review
       requested by PEL). No change in the overall concentrations was identified for the
       discrete receptor model at the sensitive receptors, therefore this was not adopted in
       running the gridded receptors.

EMISSION RATES


  •    ‘K Factor’ of 2.2 applied in accordance with the Best Practice Guidance for the
       Poultry Industry document
  •    Maximum ventilation rate set at 10m3/hour/bird in accordance with the Best Practice
       Guidance for the Poultry Industry document