Description and validation of ERAD: An atmospheric dispersion model for high explosive detonations
The Explosive Release Atmospheric Dispersion (ERAD) model is a three-dimensional numerical simulation of turbulent atmospheric transport and diffusion. An integral plume rise technique is used to provide a description of the physical and thermodynamic properties of the cloud of warm gases formed when the explosive detonates. Particle dispersion is treated as a stochastic process which is simulated using a discrete time Lagrangian Monte Carlo method. The stochastic process approach permits a more fundamental treatment of buoyancy effects, calm winds and spatial variations in meteorological conditions. Computational requirements of the three-dimensional simulation are substantially reduced by using a conceptualization in which each Monte Carlo particle represents a small puff that spreads according to a Gaussian law in the horizontal directions. ERAD was evaluated against dosage and deposition measurements obtained during Operation Roller Coaster. The predicted contour areas average within about 50% of the observations. The validation results confirm the model's representation of the physical processes.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 7200334
- Report Number(s):
- SAND-92-2069; ON: DE93002515
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540130* -- Environment
Atmospheric-- Radioactive Materials Monitoring & Transport-- (1990-)
CHEMICAL EXPLOSIONS
COMPUTERIZED SIMULATION
DETONATIONS
ENVIRONMENTAL TRANSPORT
EXPLOSIONS
FUNCTIONS
LAGRANGIAN FUNCTION
MASS TRANSFER
MONTE CARLO METHOD
NUCLEAR EXPLOSIONS
PLUMES
RADIONUCLIDE MIGRATION
SIMULATION
THREE-DIMENSIONAL CALCULATIONS
WIND