A proportionate modelling approach
We select models to answer the assessment question efficiently and defensibly, considering available data, receptors, terrain, emissions and applicable requirements.
Meteorological basis
Meteorology underpins pollutant transport and dispersion. Depending on the study, we use observations, representative stations or WRF-derived modelled fields.
Screening assessment
Screening tools such as SCREEN help establish whether a refined dispersion assessment is required.
Refined dispersion modelling
Where required, dispersion models estimate concentrations and potential areas of influence using emissions, meteorology, terrain and source characteristics.
Specialist applications
Where warranted, we assess photochemical pollutants, odour impacts or accidental release scenarios using appropriate specialist tools.
Tools selected for the assessment question
WRF meteorology
WRF generates spatial fields of wind, temperature, stability and mixing where site-specific modelled meteorology is required.
Screening assessment
SCREEN provides an initial indication of potential effects and whether a refined dispersion modelling study should be undertaken.
CALPUFF and AERMOD dispersion modelling
CALPUFF and AERMOD are widely used to assess impacts from primary pollutants in environmental studies and permitting work.
Odour assessment
Odour studies apply specific assessment criteria and metrics to evaluate potential effects on communities and sensitive receptors.
Accidental release and risk assessment
For accidental releases of hazardous substances, the model is selected for the substance, release conditions, duration and risk question.
Photochemical modelling
CAMx or WRF-Chem may be considered for secondary formation, ozone, secondary PM2.5 or regional transport in specific cases.
Not sure which modelling approach is appropriate?
We can define a proportionate, technically robust approach based on the assessment question, available data and applicable requirements.
Contact us