Two-dimensional dynamical drainage-flow model with Monte Carlo transport and diffusion calculations
A simplified drainage flow model was developed from the equations of motion and the mass continuity equation in a terrain-following coordinate system. The equations were reduced to a two-dimensional system by vertically integrating over the drainage layer. A numerical solution for the drainage layer depth and wind field was obtained using a fourth order finite difference scheme. A Monte Carlo simulation was used to calculate the transport and diffusion of tracer gases. Model simulations of drainage flow have been compared to observations from the 1980 Geysers area experiments. The Geysers area is mountainous, with steep slopes, some of which are steeper than 10/sup 0/. The model predictions of wind direction are good, but with speeds are not predicted as accurately. Simulation of perfluorocarbon tracer concentrations were in good agreement with observed values. Maximum tracer concentration was predicted to within a factor of five. While predicted plume arrival was somewhat early, the model closely predicted the duration of the passage for plume concentrations greater than 0.5 ppt. The two-dimensional model was found to work equally well in simulating drainage flows over the Savannah River Plant (SRP) and surrounding terrain with slopes of around 1/sup 0/. The model correctly predicted that drainage winds at SRP are usually shallower than 60 m, which is the height at which meteorological towers measure the winds in the SRP production areas. The modest computational requirements of the model make it suitable for use in screening potential industrial sites.
- Research Organization:
- Du Pont de Nemours (E.I.) and Co., Aiken, SC (USA). Savannah River Lab.
- DOE Contract Number:
- AC09-76SR00001
- OSTI ID:
- 6379485
- Report Number(s):
- DP-1639; ASCOT-82-6; ON: DE83009386
- Resource Relation:
- Other Information: Portions are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AIR POLLUTION
DIFFUSION
COMPLEX TERRAIN
DRAINAGE
MATHEMATICAL MODELS
ENVIRONMENTAL TRANSPORT
FINITE DIFFERENCE METHOD
GAS FLOW
GEYSERS GEOTHERMAL FIELD
HYDROGEN SULFIDES
MONTE CARLO METHOD
NUMERICAL SOLUTION
PLUMES
SAVANNAH RIVER PLANT
SIMULATION
TRACER TECHNIQUES
TWO-DIMENSIONAL CALCULATIONS
VELOCITY
WIND
CHALCOGENIDES
FLUID FLOW
GEOTHERMAL FIELDS
HYDROGEN COMPOUNDS
ISOTOPE APPLICATIONS
ITERATIVE METHODS
MASS TRANSFER
NATIONAL ORGANIZATIONS
POLLUTION
SULFIDES
SULFUR COMPOUNDS
US AEC
US DOE
US ERDA
US ORGANIZATIONS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
500100 - Environment
Atmospheric- Basic Studies- (-1989)