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Instruction on AERSCREEN

Instruction on AERSCREEN. ——A screening mode for AERMOD. Jun Wang 03/24/2011. A Brief Outline. AERMOD/AERSCREEN history AERSCREEN overview AERSCREEN features Installation User interface Example run. AERMOD/AERSCREEN History. AERMOD

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Instruction on AERSCREEN

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  1. Instruction on AERSCREEN ——A screening mode for AERMOD Jun Wang 03/24/2011

  2. A Brief Outline • AERMOD/AERSCREEN history • AERSCREEN overview • AERSCREEN features • Installation • User interface • Example run AERSCREEN Tutorial

  3. AERMOD/AERSCREEN History • AERMOD • Initially developed in 1991, release in 2000, adopted in 2005. • Point, area, volume Sources • Simple or complex terrain • Transport distance up to 50 km • SCREEN option added to AERMOD in 1995 forces model to calculate centerline concentration for each source/receptor/meteorology combination. AERSCREEN Tutorial

  4. AERMOD/AERSCREEN History • AERSCREEN • Initially developed by Jim Haywood, Michigan DEQ • Draft submitted to EPA 4/25/06 (Alpha) • Release to public (Beta) • Latest version 11076 was released on 03/17/11 • MAKEMET, BPIPPRM and AERMAP to generate necessary AERMOD inputs. AERSCREEN Tutorial

  5. Overview of AERSCREEN • MAKEMET program generates matrix of meteorological conditions based on user-specified surface characteristics, formatted for input to AERMOD (.sfc and .pfl files) AERSCREEN Tutorial

  6. Overview of AERSCREEN • Components of AERSCREEN • AERSCREEN main program • MAKEMET • BPIPPRPM • AERMAP • Running screen mode in two ways • Run AERSCREEN alone • Run AERMOD with screening option based on MAKMET Will the two results same? Comparing to SCREEN3 AERSCREEN Tutorial

  7. Overview of AERSCREEN • Source type: • Single point source(vertical uncapped stack) • Capped stack • Horizontal stack • Rectangular area or circular area • Flare • Volume source • Routine to find maximum concentration for automatic receptor distances AERSCREEN Tutorial

  8. Overview of AERSCREEN • Data entered via prompts or by input file • No deposition • MAKEMET meteorology • Internal matrices of other meteorological parameters AERSCREEN Tutorial

  9. Overview of AERSCREEN • Data required • Source parameters • Building downwash parameters • NOX to NO2 conversion • AERMAP (Terrain heights) • MAKEMET • Ambient minimum and maximum temperatures • Minimum wind speed and anemometer height • Surface characteristic (albedo, Bowen ratio, roughness) • Probe distance • Urban(population)/Rural • Flagpole receptor or discrete receptor (up to 10) AERSCREEN Tutorial

  10. Overview of AERSCREEN • DEM File • Suggest use AERMOD view to generate *.DEM file • Download from AERMOD view, find it at cache file folder • Create demlist.txt AERSCREEN Tutorial

  11. Overview of AERSCREEN • Discrete receptor file • A txt file Discrete receptors can be up to 10. AERSCREEN Tutorial

  12. Overview of AERSCREEN • Average time factor • Based on the upper bound of SCREEN3 • No annually average for area source AERSCREEN Tutorial

  13. Overview of AERSCREEN James Thurman, 2006 AERSCREEN Tutorial

  14. Overview of AERSCREEN • MAKEMET • Default value: min wind speed 0.5 m/s Anemometer height 10 m Single wind direction 270 deg • User-specified surface characteristics – albedo, Bowen ratio, and surface roughness • Use seasonally varying surface characteristics for generic land use classifications. (AERSURFACE) • Input an external file (AERMET Stage 3) AERSCREEN Tutorial

  15. Overview of AERSCREEN • MAKEMET • Looping through • Wind speeds • Cloud covers • Ambient temperatures • Solar elevation angles • Convective velocity scales • Result • Friction velocity (U*) • Monin-Obukhov length (L) • Zim • Zic and w* for convective case AERSCREEN Tutorial

  16. AERSCREEN Features • All the input will go to AERSCREEN.INP • No necessary building downwash for area and volume source. • Zero or negative stack temperature will treat as temperature difference AERSCREEN Tutorial

  17. AERSCREEN Features • Point, capped stacks and horizontal stack sources • Emission rate (lb/hr or g/s) • Stack height (feet or meters) • Stack diameter (inches or meters) • Stack temperature (degrees Fahrenheit or Kelvin) • Stack velocity (ft/s or m/s) or flow rate (ACFM) AERSCREEN Tutorial

  18. AERSCREEN Features • Flare source • Emission rate (lb/hr or g/s) • Stack height (feet or meters) • Total heat release rate (cal/sec) • Radiative heat loss fraction AERSCREEN Tutorial

  19. AERSCREEN Features • Volume source • Emission rate (lb/hr or g/s) • Release height, i.e. center of volume (feet or meters) • Initial lateral dimension of the volume (feet or meters) • Initial vertical dimension of the volume (feet or meters) AERSCREEN Tutorial

  20. AERSCREEN Features • Rectangular/Circular area source • Emission rate (lb/hr or g/s) • Release height above ground (feet or meters) • Long and short dimensions of area (feet or meters) orRadius of circle (feet or meters) • Initial vertical dimension of plume (feet or meters) AERSCREEN Tutorial

  21. AERSCREEN Features • NOx to NO2 conversion • Ozone Limiting Method (OLM) • Plume Volume Molar Ratio Method (PVMRM) • Input • NOx/NO2 in stack ratio • Background ozone concentration AERSCREEN Tutorial

  22. AERSCREEN Features • Building downwash • Building height (feet or meters) • Maximum building horizontal dimension (feet or meters) • Minimum building horizontal dimension (feet or meters) • Degrees from North of maximum building horizontal dimension (0-179 degrees) • Degrees from North of stack location relative to building center (0-360 degrees) • Distance between stack and building center (feet or meters) AERSCREEN Tutorial

  23. AERSCREEN Features AERSCREEN Tutorial

  24. AERSCREEN Features • Meteorology and surface characteristics • Minimum and maximum ambient air temperatures (Fahrenheit or Kelvin) • Minimum wind speed (m/s) • Anemometer height (m) • Surface characteristics type (user-entered, AERMET tables, or surface characteristics listed in an external file) AERSCREEN Tutorial

  25. AERSCREEN Features • Terrain • Probe distance (meters) • Discrete receptor distances • Flagpole receptors • Source elevation or use AERMAP to determine source elevation • Source coordinates (geographic or UTM) • NAD datum (NAD 27 or 83) • UTM zone • Urban/Rual • Minimum ambient distance AERSCREEN Tutorial

  26. AERSCREEN Features • Output • AERSCREEN.OUT • max_conc_distance.txt, AERSCREEN Tutorial

  27. Installation • Download from • http://www.epa.gov/scram001/dispersion_screening.htm • Extract AERSCREEN, MAKEMET, AERMOD, AERMAP, BPIPRPM in same directory • Or simply download from • http://plaza.ufl.edu/j.wang/aerscreen.zip • Extract and go AERSCREEN Tutorial

  28. User interface • Windows interface available • $370~$450 AERSCREEN Tutorial

  29. Example run • See handout and screen. AERSCREEN Tutorial

  30. Summary • What is the component of AERMOD family? (except AERMOD itself) AERSCREEN Tutorial

  31. Thanks! AERSCREEN Tutorial

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