First look at the new ARAC dispersion model
Conference
·
OSTI ID:653914
We describe a new atmospheric dispersion model being developed for the emergency response system of the US Department of Energy`s Atmospheric Release Advisory Capability (ARAC). This model solves the turbulent, advection-diffusion equation via a Lagrangian particle, Monte-Carlo method. Within a simulation, particles representing the pollutant are moved through the domain using a random displacement method to model the turbulent diffusion and a Runge-Kutta method to model the advection. The bottom boundary in the new model is a union of bilinear surfaces between gridded terrain data rather than the discontinuous `stair step` representation of terrain used previously in the ARAC. The new model accepts winds on (x,y,o) grids that can be horizontally and vertically graded and nested in the horizontal.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 653914
- Report Number(s):
- UCRL-JC--125034; CONF-970419--; ON: DE98054673; BR: DP0402061
- Country of Publication:
- United States
- Language:
- English
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