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Tracer Experiments Barrio Logan

Tracer Experiments Barrio Logan. Working Draft Do Not Cite or Quote Tony Servin, P.E. Shuming Du, Ph.D. Vlad Isakov, Ph.D. September 12, 2002 Air Resources Board California Environmental Protection Agency. Working Draft - Do Not Cite or Quote. General Location. Lindbergh Field

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Tracer Experiments Barrio Logan

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  1. Tracer ExperimentsBarrio Logan Working Draft Do Not Cite or Quote Tony Servin, P.E. Shuming Du, Ph.D. Vlad Isakov, Ph.D. September 12, 2002 Air Resources Board California Environmental Protection Agency

  2. Working Draft - Do Not Cite or Quote General Location • Lindbergh Field • North Island • Shipping Lane • Logan Memorial

  3. Tracer Experiment Purpose • Develop a source-receptor relationship database • Evaluate dispersion models for community health modeling • Provide a recommendation for community health models and model options Working Draft - Do Not Cite or Quote

  4. The Experiment • SF6 tracer release (Summer & Winter) • August 2001 • December 2001 • 43 to 50 fixed sampling sites • One mobile van continuous sampling • Meteorological measurements • At the source • In receptor field • Contract w/ UC Riverside Working Draft - Do Not Cite or Quote

  5. Draft Tracer SF6 Release (1/2) • UCR Student verifying SF6 flow • Continuous Release: 7am to 8 pm

  6. Draft Tracer SF6 Release (2/2) • SF6 released 5m above ground from PVC pipe

  7. Draft SF6 Release RateSummer (August 2001) • SF6 released 9am to 8pm • 8/29 released from 3pm to 2am

  8. Draft SF6 Release RateWinter (December 2001) SF6 released 7am to 8pm

  9. Draft Fixed Bag Sampler, Residence • Hourly SF6 sampling at 43 sites • 10 am to 6 pm

  10. Barrio Logan Source & Receptors August, 2001 Draft Logan Memorial Tracer Release, NASSCO

  11. Barrio Logan Source & Receptors December, 2001 Draft Logan Memorial Tracer Release

  12. Draft Mobile Sampler Continuous SF6 sampling

  13. Draft Barrio Logan Source & Mobile Van Route, August 2001 Yellow dots - fixed samplers Black lines - mobile van path

  14. Draft Vertical Array of Sonic Anemometers • Logan Memorial Jr. High • Surface winds and turbulence

  15. Draft Mini-SODAR (Logan Memorial) Vertical profile of winds • u, WD, Su, Sv, Sw • range: 15m to 200m • layer resolution: 5m

  16. Draft Sonic Anemometer • Sonic anemometer at release site • Surface winds and turbulence

  17. Draft NASSCO Wind Roses Summer sampling period (3pm to midnight) Winter sampling period (10am to 6pm) Summer sampling period (10 am to 8pm)

  18. Draft Observed SF6 (ppt) Dec. 19, 2001 (1pm)

  19. Draft Observed SF6 (ppt) Dec. 17, 2001 (3pm)

  20. Draft Predicted vs Observed (AERMOD - Winter) SF6, Paired Hourly Data

  21. Barrio Logan Terrain Features (Calpuff) Draft

  22. CALMET Winds, December 17, 2001 (5pm) Working Draft - Do Not Cite or Quote

  23. CALPUFF Predictions, December 17, 2001 (5pm) Working Draft - Do Not Cite or Quote

  24. Predicted vs Observed (CALPUFF - Winter) SF6, Paired Hourly Data Working Draft - Do Not Cite or Quote

  25. Micro-scale modeling may not adequately simulate dispersion in complex urban environments on a one-for-one hourly basis • Tracer data may need further QA • e.g., 10 hours of 32 hours of winter measurements show the peak concentration higher at 2 km from source rather than 1 km from source. Possible Reasons for Scatter in Data Working Draft - Do Not Cite or Quote

  26. Screening of Tracer Data • Need to screen observed data • Suggested criteria for screening • Observation near limit of detection or saturation • Siting and exposure criteria for each sampler • Equipment maintenance history • Potential of tampering by curious public or domestic animals Working Draft - Do Not Cite or Quote

  27. Tracer Experiment Summary • Develop a source-receptor relationship database • Screen and stratify data • Evaluate dispersion models for community health modeling • Provide a recommendation for community health models and model options Working Draft - Do Not Cite or Quote

  28. Future Work • Screen and stratify tracer data • Screen and stratify meteorological data for consistency with plume centerline observations • Recommend model and model options for microscale modeling for community health Working Draft - Do Not Cite or Quote

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