||Comparison of design concentrations based on hourly mixing heightsd estimated by rammet and metpro.
Paumier, J. O. ;
Borde, R. W.
||Pacific Environmental Services, Inc., Research Triangle Park, NC.;Environmental Protection Agency, Research Triangle Park, NC. Office of Air Quality Planning and Standards.
|| U.S. EPA, Office of Air Quality Planning and Standards,
Air pollution ;
Meteorological data ;
Mathematical models ;
Performance evaluation ;
Atmospheric circulation ;
Atmospheric diffusion ;
Oklahoma City(Oklahoma) ;
||Region 1 Library/Boston,MA
||Region 4 Library/Atlanta,GA
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||vi, 24 leaves : illustrations ; 28 cm
A consequence analysis was conducted to investigate the effect on design concentration values resulting from using two different methods for estimating mixing height. Two years of meteorological data from Pittsburgh, PA, Oklahoma City, OK and Brownsville, TX were processed through RAMMET and METPRO meteorological preprocessors. The mixing heights from METPRO were merged with the RAMMET output and separate ISCST2 model runs were made using the two sets of mixing heights from each site and year. The effects of the two mixing-height algorithms on predicted high second-high pollutant concentrations (design concentrations) were compared. The 1-hr design concentrations using mixing height estimates from METPRO were generally larger than those using RAMMET mixing heights for the three point sources by about 20%. Similar results were obtained when the data were paired in time and space. This tendency was not as apparent for other averaging times. For the ground-level area source, the potential for unusually large concentrations from extremely small mixing heights is far greater when using RAMMET mixing heights.
"December 1993." Includes bibliographical references (page 24). "EPA-454/R-93-052."