Record Display for the EPA National Library Catalog
RECORD NUMBER: 3415 OF 3465Main Title | Users' Manual for the APRAC-2 Emissions and Diffusion Model. | |||||||||||||||||||||
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CORP Author | Stanford Research Inst., Menlo Park, Calif.;Environmental Protection Agency, San Francisco, Calif. Region IX. | |||||||||||||||||||||
Publisher | United States Environmental Protection Agency, Region IX, | |||||||||||||||||||||
Year Published | 1977 | |||||||||||||||||||||
Report Number | EPA-68-01-3807; EPA 909-B-77-001 | |||||||||||||||||||||
Stock Number | PB-275 459 | |||||||||||||||||||||
OCLC Number | 1053848161 | |||||||||||||||||||||
Subjects | Computer science ; Waste gases ; Mathematical models ; United States | |||||||||||||||||||||
Additional Subjects | Computer programs ; Mathematical models ; Air pollution ; Exhaust emissions ; Atmospheric diffusion ; Concentration(Composition) ; Computerized simulation ; Programming manuals ; Hydrocarbons ; Carbon monoxide ; Nitrogen oxides ; Emission factors ; APRAC2 computer program | |||||||||||||||||||||
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Collation | 256 pages Illustrations, charts, tables ; 28 cm. | |||||||||||||||||||||
Abstract | The computer program for a completely revised version of the APRAC-1A diffusion model is presented and discussed. The new code uses EPA's emissions calculation methodology from Supplement No. 5 to AP-42. Gridded, and link by link emissions can be output for hydrocarbons, carbon monoxide or oxides of nitrogen. Diffusion calculations make use of a receptor-oriented Gaussian plume model. Local winds at the receptor can be used; they are interpolated from multiple wind inputs. Mixing heights may be calculated from sounding data, or input directly. Two local source models are available, one treating pollutant behavior in a street canyon, the other treats vehicle and pollutant effects at a signalized intersection. A small program is included for decoding Federal Highway Administration data tapes. |
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Notes | "June 1977." "EPA-68-01-3807." "Contract No. 68-01-3807." Includes bibliographical references (pages 255-256). |
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Contents Notes | The computer program for a completely revised version of the APRAC-1A diffusion model is presented and discussed. The new code uses EPA's emissions calculation methodology from Supplement No. 5 to AP-42. Gridded, and link by link emissions can be output for hydrocarbons, carbon monoxide or oxides of nitrogen. Diffusion calculations make use of a receptor-oriented Gaussian plume model. Local winds at the receptor can be used; they are interpolated from multiple wind inputs. Mixing heights may be calculated from sounding data, or input directly. Two local source models are available, one treating pollutant behavior in a street canyon, the other treats vehicle and pollutant effects at a signalized intersection. A small program is included for decoding Federal Highway Administration data tapes. |