ARAC dispersion modeling of the July 26, 1993 oleum tank car spill in Richmond, California
- EG and G Energy Measurements, Inc., Pleasanton, CA (United States)
This report presents the results from the real-time response on the day of the spill followed by a re-assessment of the spill. Worst-case source terms and readily available meteorological data (met data) were used for the real-time response. ARAC employs a three-dimensional, diagnostic, finite-difference dispersion modeling system for estimating the consequences from accidental atmospheric releases. MATHEW (Mass-Adjusted Three- Dimensional Wind field), a Eulerian wind field code, and ADPIC (Atmospheric Diffusion by Particle-In-Cell), a hybrid Eulerian-Lagrangian dispersion model, from the core of the system. For a particular incident a model grid is selected to encompass the area of concern and is generated using underlying terrain from on-line data. Meteorological data from multiple surface and upper air stations are automatically acquired in real time primarily from local airports and formatted to initialize the wind field model. Dispersion parameters are determined from meteorological data and the source term from available information. The system is designed to simulate releases from single or multiple radioactive releases, such as ventings, spills, fires, or explosions. Solid and liquid aerosols and neutrally-buoyant gases are modeled. Particle size distributions are input for each aerosol source and modeled using gravitational settling and wet and dry deposition, if applicable. The system can be readily applied to neutrally-bouyant, nonradioactive chemical releases which do not undergo significant physical or chemical conversion processes.
- Research Organization:
- EG and G Energy Measurements, Inc., Pleasanton, CA (United States); Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- California State Government, Sacramento, CA (United States); USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC08-88NV10617; W-7405-ENG-48; AC08-93NV11265
- OSTI ID:
- 10137425
- Report Number(s):
- UCRL-ID-116012; EGG-11265-4009; ON: DE94009037
- Resource Relation:
- Other Information: PBD: 3 Feb 1994
- Country of Publication:
- United States
- Language:
- English
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