AERMOD - 9/13/11 Aerosol & Particulate History of...

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Unformatted text preview: 9/13/11 Aerosol & Particulate History of AERMOD Development Collaboration between American Meteorological Society (AMS) and EPA, starting from 1991. To introduce Planetary Boundary Layer (PBL) concept into regulatory dispersion models: CBL (Convective Boundary Layer): a mixed layer characterized by vigorous turbulence tending to stir and uniformly mix SBL (Stable Boundary Layer): a cool layer of air adjacent to a cold surface of the earth, where temperature within that layer is statically stably stratified. Also include plume interaction with terrain, surface releases, building downwash and urban dispersion 9/13/11 Aerosol & Particulate 11 9/13/11 Aerosol & Particulate Based on ISC3 Developed based on the EPAs regulatory platform: Adopt ISC3s (Industrial Source Complex) input/output computer architecture Update antiquated ISC3 model algorithms with state-of- the art modeling techniques Ensure the source and atmospheric processes modeled by ISC3 can continue to be handled, albeit in an improved manner 9/13/11 Aerosol & Particulate 22 9/13/11 Aerosol & Particulate New/Improved Algorithms relative to Dispersion in both the convective and stable boundary layers Plume rise and buoyancy Plume penetration into elevated inversions Computation of vertical profiles of wind, turbulence and temperature Urban night-time boundary layer Treatment of receptors on all types of terrain from the surface up to and above the plume height Treatment of building wake effects An improved approach for characterizing the fundamental boundary layer parameter Treatment of plume meander 9/13/11 Aerosol & Particulate 33 9/13/11 Aerosol & Particulate Modeling System Structure 9/13/11 Aerosol & Particulate 44 9/13/11 Aerosol & Particulate Two Pre-Processors AERMET: uses meteorological data and surface characteristics to calculate boundary parameters (e.g. mixing height, friction velocity, etc) AERMAP: uses gridded terrain data for the modeling area to calculate a representative terrain-influence height associated with each receptor location 9/13/11 Aerosol & Particulate 55 9/13/11 Aerosol & Particulate How AERMOD Models Terrain No need to specify the terrain type (flat, simple or complex) Treat a plume as a combination two limiting cases: horizontal plume (terrain impacting) terrain-following plume 9/13/11 Aerosol & Particulate 66 9/13/11 Aerosol & Particulate 9/13/11 Aerosol & Particulate 77 9/13/11 Aerosol & Particulate Sum of Two States Total is the weighted sum of the concentrations from these two states ( f : plume state weighting factor) Plume state weighting factor depends on fraction of plume mass ( p ) below critical dividing streamline ( Hc ) 9/13/11 Aerosol & Particulate 88 { } { } ( 29 { } p r r S C r r r S C r r r T z y x C f z y x C f z y x C , , 1 , , , , , ,- + = Total conc....
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This note was uploaded on 09/11/2011 for the course ENV 6146 taught by Professor Staff during the Spring '11 term at University of Florida.

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AERMOD - 9/13/11 Aerosol & Particulate History of...

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