AERSCREEN AERSCREEN

88THTH MODELING CONFERENCE MODELING CONFERENCESEPTEMBER 22, 23 2005SEPTEMBER 22, 23 2005

AERSCREEN WORKGROUP AERSCREEN WORKGROUP PROGRESS REPORTPROGRESS REPORT

• WORKGROUP GOALWORKGROUP GOAL: Develop an AERMOD screening : Develop an AERMOD screening procedure (AERSCREEN) that will provide procedure (AERSCREEN) that will provide concentrations as conservative as predicted by concentrations as conservative as predicted by AERMOD in refined mode and allow quick run time. AERMOD in refined mode and allow quick run time.

• CURRENT PROGRESSCURRENT PROGRESS: AERSCREEN v1.6 (Beta) has : AERSCREEN v1.6 (Beta) has been developed and is currently being tested. This been developed and is currently being tested. This version contains all desired elements (i.e. including version contains all desired elements (i.e. including wake, terrain and averaging period ratios) for point wake, terrain and averaging period ratios) for point sources. The documentation is being developed. We sources. The documentation is being developed. We plan to release this version within the next several plan to release this version within the next several weeks.weeks.

AERSCREENAERSCREENFINALIZATION WORKGROUPFINALIZATION WORKGROUP

• Jim Haywood, Chair, MichiganJim Haywood, Chair, Michigan• Roger Brode, MACTECRoger Brode, MACTEC• Herman Wong, EPAHerman Wong, EPA• Warren Peters, EPAWarren Peters, EPA• Karen Wesson, EPAKaren Wesson, EPA• Bob Paine, ENSRBob Paine, ENSR• Anna Maria Coulter, EPAAnna Maria Coulter, EPA

AERSCREENAERSCREENBETA VERSION CURRENT CAPABILITYBETA VERSION CURRENT CAPABILITY

Interactive data entry (DOS Screen)Interactive data entry (DOS Screen) Point source onlyPoint source only Flat and Complex terrain (DEM 1-degree files)Flat and Complex terrain (DEM 1-degree files) PRIME building downwash (specific stack location)PRIME building downwash (specific stack location) MAKEMET meteorology with site specific surface profilingMAKEMET meteorology with site specific surface profiling Re-Use of Previous AERSCREEN Run FilesRe-Use of Previous AERSCREEN Run Files Stand-alone version of MAKEMET for “refined” screen Stand-alone version of MAKEMET for “refined” screen

runsruns

AERSCREEN SCALABLE RATIOSAERSCREEN SCALABLE RATIOS

24-Hour Averaging Period

0.000

0.100

0.200

0.300

0.400

0.500

0.600

0.700

0.800

0.900

5 10 15 20 30 40 60 80 100 200

Stack Height (meters)

Av

era

gin

g P

eri

od

Sc

ali

ng

Ra

tio

Non-Buoy

Buoyant

AERSCREENAERSCREENPROGRAM RUN – BUILDING DATAPROGRAM RUN – BUILDING DATA

6 0 D eg

2 5 fee t( 9 0 D eg )

N o rth

S tack

120 fee t

80 feet

AERSCREEN RESTART FILEAERSCREEN RESTART FILE

1-hour Results1-hour ResultsDatabaseDatabase TypeType No. of No. of

sourcessourcesMax. Max. RatioRatio

Min. Min. RatioRatio

MedianMedian

RatioRatio

Jim HaywoodJim Haywood Misc.Misc. 77 5.205.20 1.091.09 2.352.35

Karen WessonKaren Wesson Stack Stack downwashdownwash 3232 2.542.54 0.750.75 1.121.12

Karen WessonKaren Wesson Stack non-Stack non-downwashdownwash 2626 2.182.18 0.970.97 1.491.49

Roger BrodeRoger Brode

Varying Varying source source

distances & distances & min. wind min. wind

speedspeed

672672 22.1622.16 0.960.96 1.251.25

Bob PaineBob Paine Complex Complex TerrainTerrain 2828 7.467.46 1.081.08 2.232.23

Annual ResultsAnnual Results Database Type No. of

sourcesMax. Ratio

Min. Ratio

MedianRatio

Jim Haywood Misc. 7 13.2 1.10 6.37

Karen WessonStack

downwash32 3.26 0.75 1.85

Karen WessonStack non-downwash

26 6.45 0.98 2.75

Bob PaineComplex Terrain

28 71.5 4.42 19.1