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RECORD NUMBER: 129 OF 869

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Main Title

Complex Terrain Dispersion Model - Computer Code (for Microcomputers).

Author

Perry, S. ;

CORP Author

Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab.

Year Published

1988

Report Number

EPA/600/8-87/058; EPA/SW/DK-88/039;

Stock Number

PB88-162169

Additional Subjects

Atmospheric circulation ; Terrain ; Electric power plants ; Diskettes ; Mathematical models ; Atmospheric diffusion ; Plumes ; Air pollution ; Trends ;

Internet Access

Description	Access URL
	https://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=2000XILK.PDF

Holdings

Library	Call Number	Additional Info	Location	Last Modified	Checkout Status
NTIS	PB88-162169	Some EPA libraries have a fiche copy filed under the call number shown.		07/26/2022

Collation

4 diskettes

Abstract

The Complex Terrain Dispersion Model (CTDM) is a refined air quality model for use in stable and neutral conditions in complex terrain applications. Its use of meteorological input data and terrain information is different than current EPA models; considerable detail for both types of input data are required and are supplied by preprocessors specifically designed for CTDM. CTDM requires the parameterization of individual hill shapes using the terrain preprocessor and the association of each model receptor with a particular hill (except for receptors in flat terrain, which CTDM can also handle). A central feature of CTDM is its use of a critical dividing-streamline height (Hc) to separate the flow in the vicinity of a hill into two separate layers. Flow in the upper layer has sufficient kinetic energy to pass over the top of the hill while streamlines in the lower layer are constrained to flow in a horizontal plane around the hill.

Supplementary Notes