AWMA Presentation : Application of Two State-of-the-art Dispersion Models

1. Paul Complin 1 , Robert Lyng 2 , Hong Liu 3 , Alan Cocks 4 1ORTECH Environmental, [email_address] 2 Ontario Power Generation Inc., rob.lyng@opg.com 3 PhD Candidate, York University, [email_address] 4 EnviroAnalytics, alan.cocks@enviroanalytics.com Application of Two State-of-the-art Dispersion Models

7. Lake Erie Lake Ontario Nanticoke GS Buffalo Toronto Detroit

10. AERMOD Performance

11. Modelling Methodology

12. Two Models: AERMOD & ADMS AERMOD ADMS Both “New Generation” models Components are based on similar sets of state-of-the-art algorithms to describe the state of atmospheric boundary layer Bimodal distribution of turbulent vertical velocities for convective conditions. Regulatory model in US & Ontario and Alternative model elsewhere. Regulatory model in UK and Alternative model in US. Allows vertical profiles of wind and temperature to be input. Requires only one level of near-ground observations to be input, but could take the state of the art ABL as input. Contains shoreline module.

13. Dispersion Factors for Five Scenarios (all units at MCR)

14. Key Model Parameters Monin-Obukhov Length Boundary Layer Depth y

15. Wind Speed versus Dispersion Factor

16. 1/L mo versus Dispersion Factor

17. Model Parameters for 1000 highest Maximum Dispersion Factors Monin-Obukhov Length Boundary Layer Depth

18. Dispersion Factors for Five Scenarios (all units at MCR)

20. Paul G. Complin Principal- Compliance and Permitting ORTECH Environmental 804 Southdown Road Mississauga, ON, Canada L5J 2Y4 Phone 905 822-4120 e266 or 877-774-6560 e266 Fax 905 855-0406 [email_address] www.ortech.ca Questions?