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Microscale Air Dispersion Modeling in Neighborhoods: March 28, 2001 Draft

Explore the status of a community health assessment program through a microscale air dispersion model draft, featuring multiple source types, pollutant variations, meteorological data, and model comparisons. Investigate the impact of pollutants like formaldehyde, Cr(VI), benzene, and diesel exhaust PM using models like ISCST3, AERMOD, CAL3QHC, and CALPUFF. Gain insights into GIS geolocation, wind field effects, terrain influences, and ongoing follow-up studies.

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Microscale Air Dispersion Modeling in Neighborhoods: March 28, 2001 Draft

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  1. Microscale Air Dispersion Modeling StatusCommunity HealthNeighborhood Assessment Program Working Draft March 28, 2001

  2. Three Types of Inventory • Area-Wide Sources (e.g. consumer products) • Motor Vehicle (e.g. freeway) • Point Source • Traditional Points (e.g. NASCO) • Includes Some “Area-Wide” Sources (e.g. auto repair)

  3. Models for Microscale • ISCST3 • Traditional workhorse model • AERMOD • Latest USEPA model for microscale • Calpuff • 3 dimensional wind field • CALINE • EPA line source model • Lagrangian Particle Dispersion Model • New emerging model

  4. GIS Streets for Geolocating

  5. USGS TOPO for Geolocating

  6. Some Facts • 600+ Individual Point Sources • 64 Individual Pollutants • Diurnal Variation of Emissions • Meteorological Data from Memorial Jr High • November 1999 thru October 2000 • Coarse Grid Receptor Field (500 m grid spacing) • Fine Grid Receptor Field (50m-100m grid spacing)

  7. Wind Rose

  8. Topography near Barrio Logan

  9. ISCST3 Results • Preliminary • Formaldehyde • Cr(VI) • Point Sources Only

  10. ISCST3 Formaldehyde

  11. ISCST3 Cr(VI)

  12. ISCST3 Cr(VI)

  13. AERMOD Results • Preliminary • Formaldehyde • Cr(VI) • Point Sources Only

  14. AERMOD Formaldehyde

  15. AERMOD Cr(VI)

  16. ISCST3 vs AERMOD Formaldehyde

  17. ISCST3 vs AERMOD Cr(VI)

  18. CAL3QHC Results • Preliminary • Benzene • Diesel Exhaust PM • Motor Vehicle Only

  19. CAL3QHC Benzene

  20. CAL3QHC Diesel PM

  21. CALPUFF Modeling System • CALMET • Multiple sources of meteorological data • 3-dimensional wind field • CALPUFF • non-steady state modeling (i,e., puff model)

  22. CALMETTerrain elevation used to calculate wind field

  23. CALMETLand type used to calculate heat flux and turbulence parameters

  24. CALMETSurface wind field showing terrain effect(night)

  25. CALPUFF Non-steady State Puffs(An Example - Next Two Slides) • November 11, 1999 • Mn emissions terminate after the 4pm hour • For the 5pm hour • AERMOD and ISC • show zero concentration • CALPUFF • shows non-zero concentration • emission puff still in domain

  26. CALPUFF 4 PM hour non-zero Mn emissions

  27. CALPUFF5 PM hourzero Mn emissions

  28. CALPUFF(Preliminary) Mn Annual avg. conc., point source emissions

  29. Microscale Follow Up Work • Sensitivity studies (e.g., receptor field, source configuration) • Overlay concentration fields from line sources and point sources • Update inventory based on modeling results (iterative procedure) • Continue with CALPUFF analysis • Evaluate Model Performance

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