CTDMPLUS: A dispersion model for sources near complex topography. Part 1. Technical formulations

Technical Report · Wed Jan 01 04:00:00 EST 1992

OSTI ID:7162488

Perry, S G

The Complex Terrain Dispersion Model (CTDMPLUS), a point-source, steady-state, model for complex terrain applications, is described. The model is unique in the manner in which it simulates the flow and plume distortion near fully defined three-dimensional terrain. Emphasis is given to windward side impacts. Simplicity is maintained by applying flow distortion corrections to flat-terrain, Gaussian and bi-Gaussian pollutant dstributions. The algorithms for stable and neutral conditions are based on the well established concept of a dividing streamline. These algorithms have been developed with the use of data from three major plume-impaction field studies and a number of fluid modeling studies. The algorithms for plumes released into convective layers are based on recent understanding of the convective boundary layer through fluid modeling, numerical modeling, and field studies. The non-Gaussian nature of vertical dispersion is accounted for; lateral dispersion is modeled with the aid of convective scaling concepts.

• Research Organization: Environmental Protection Agency, Research Triangle Park, NC (United States). Atmospheric Research and Exposure Assessment Lab.
• OSTI ID: 7162488
• Report Number(s): PB-93-107076/XAB; EPA--600/J-92/363
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR FLOW
AIR POLLUTION
ALGORITHMS
C CODES
COMPLEX TERRAIN
COMPUTER CODES
COMPUTERIZED SIMULATION
CONVECTION
ENERGY TRANSFER
ENVIRONMENTAL TRANSPORT
FLUID FLOW
GAS FLOW
HEAT TRANSFER
MASS TRANSFER
MATHEMATICAL LOGIC
PLUMES
POINT POLLUTANT SOURCES
POLLUTANTS
POLLUTION
POLLUTION SOURCES
SIMULATION
TOPOGRAPHY