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AERMOD Implementation

Explore the Approach, Guidance Development, and Model Improvements in the AERMOD Implementation Process outlined in the 8th Conference on Air Quality Modeling. Learn about the purpose, types of guidance, and model enhancements, ensuring scientifically appropriate and consistent regulatory application of AERMOD. Understand the steps for selecting surface characteristics, defining representativeness, matching meteorological data, and much more. Stay informed about near-term and possible future improvements for AERMOD and how to navigate implementation issues effectively.

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AERMOD Implementation

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  1. AERMOD Implementation Alan J. Cimorelli 8th Conference on Air Quality Modeling Research Triangle Park, NC September 22-23, 2005

  2. Outline • Approach to AERMOD Implementation • Guidance Development • Implementation Guide • Model Improvements • Summary

  3. AERMOD Implementation Process • NEED: As implementation proceeds issues will arise • PROCESS: • ISC or AERMOD for one year after promulgation • Provide Implementation Guide with promulgation • Model Clearinghouse Process • State contacts Region • Region writes memo to Clearinghouse • Clearinghouse memo back to Region • Archive memos / Annual report • As precedents and consensus builds, develop guidance • Model improvements

  4. Guidance Development • PURPOSE: Facilitate the scientifically appropriate & consistent regulatory application of AERMOD • Basic tenets: • Keep principle based - avoid overly prescriptive guidance • Recognize the importance of initial decisions (precedence) • Allow flexibility for unique cases • Vet, document & rule-make where appropriate • Types of guidance: • Appendix “W” • EPA Report • OAQPS policy memos • Clearinghouse memos • Individual precedents

  5. Implementation Guide • Selecting Surface Characteristics (Bo, r & zo) • Defining representativeness • Matching meteorological data with source location • Selecting population for urban runs • Modeling sources in gently down-slopping terrain • Capped and horizontal stacks • AERMAP: • Domain boundary • Manual entry of terrain • Use of the area source algorithm

  6. Model Improvements • Near-Term Improvements: • AERSCREEN • Surrogate for on-site cloud cover (Bulk Richardson # approach) • Possible future improvements (e.g.): • Selecting surface characteristics (AERSURFACE) • Capped & horizontal stacks • Reformulate urban • Code optimization • Use of gridded met data • Meander for area sources • PM2.5 Output: 98th percentile concentrations • Add wind direction dependency for hc • Add additional source types: • Line source • Buoyant line • Flares • Improve Bo treatment by including soil moisture

  7. Summary • Implementation issues are expected • Implement in a manner that facilitates consistency in permitting and SIP development • Implementation process: • ISC or AERMOD for first year • Provide advice for presently understood issues (Implementation Guide) • Deal with case specific issues in a timely manner • Communicate decisions (Clearinghouse Memos) • Develop formal guidance as experience is gained and consensus is reached • Allow for flexibility • Improve AERMOD as $$$$ allow

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