Complex-Terrain Dispersion Model - computer and source code (for microcomputers). Model-Simulation

Technical Report · Mon Feb 01 04:00:00 EST 1988

OSTI ID:5351884

Perry, S

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.

• Research Organization: Environmental Protection Agency, Research Triangle Park, NC (USA). Atmospheric Sciences Research Lab.
• OSTI ID: 5351884
• Report Number(s): PB-88-161682/XAB; EPA-600/8-87/058
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
AIR POLLUTION
AIR QUALITY
ATMOSPHERIC CIRCULATION
COMPLEX TERRAIN
COMPUTER CODES
ENVIRONMENTAL QUALITY
MATHEMATICAL MODELS
PLUMES
POLLUTION