Particle-in-cell vs straight line Gaussian calculations for an area of complex topography. [Environmental transport of radioactive effluents in surface air]
Two numerical models for the calculation of time integrated air concentraton and ground deposition of airborne radioactive effluent releases are compared. The time dependent Particle-in-Cell (PIC) model and the steady state Gaussian plume model were used for the simulation. The area selected for the comparison was the Hudson River Valley, New York. Input for the models was synthesized from meteorological data gathered in previous studies by various investigators. It was found that the PIC model more closely simulated the three-dimensional effects of the meteorology and topography. Overall, the Gaussian model calculated higher concentrations under stable conditions. In addition, because of its consideration of exposure from the returning plume after flow reversal, the PIC model calculated air concentrations over larger areas than did the Gaussian model.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 7087007
- Report Number(s):
- UCRL-79236; CONF-771118-1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Atmospheric-- Radioactive Materials Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOLS
AIR
BOUNDARY LAYERS
COLLOIDS
COMPUTER CALCULATIONS
CONTAMINATION
DISPERSIONS
EARTH CRUST
ENVIRONMENTAL TRANSPORT
FLUIDS
GASES
GAUSSIAN PROCESSES
LAYERS
MASS TRANSFER
MATHEMATICAL MODELS
METEOROLOGY
PARTICLE SIZE
PLUMES
RADIOACTIVE AEROSOLS
RADIOACTIVE EFFLUENTS
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
REGIONAL ANALYSIS
SIZE
SOLS
SURFACE AIR
SURFACE CONTAMINATION
TOPOGRAPHY
TURBULENCE
VARIATIONS
WASTES