RETADD: a Regional Trajectory And Diffusion-Deposition model

Technical Report · Thu Jun 01 04:00:00 EDT 1978

DOI:https://doi.org/10.2172/6852467· OSTI ID:6852467

Begovich, C. L.; Murphy, B. D.

The Regional Trajectory and Diffusion-Deposition Model (RETADD) is based upon a version of the National Oceanic and Atmospheric Administration Air Resources Laboratory's Regional-Continental Scale Transport, Diffusion, and Deposition Model. The FORTRAN IV computer model uses a trajectory analysis technique for estimating the transport and long-range diffusion of material emitted from a point source. The wind trajectory portion of the code uses observed upper air winds to compute the transport of the material. Ground level concentrations and depositions are computed by using the Gaussian plume equation for wind trajectories projected forward in time. Options are included to specify an upper bound for the mixed layer and a chemical decomposition rate for the effluent. The limitations to the technique are discussed, the equations and model are described, and listings of the program, input, and output are included.

• Research Organization: Oak Ridge National Lab., Tenn. (USA)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6852467
• Report Number(s): ORNL/TM-5859
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOLS
AIR
AIR POLLUTION
CHEMICAL EFFLUENTS
CHEMICAL REACTIONS
COLLOIDS
COMPUTER CALCULATIONS
COMPUTER CODES
DECOMPOSITION
DEPOSITION
DISPERSIONS
ENVIRONMENTAL TRANSPORT
FLUIDS
FORTRAN
GASES
GAUSSIAN PROCESSES
MASS TRANSFER
METEOROLOGY
PLUMES
POLLUTION
PROGRAMMING LANGUAGES
R CODES
REGIONAL ANALYSIS
SOLS
SURFACE AIR
TRAJECTORIES
TURBULENCE
VELOCITY
WIND