Numerical simulations of the mountain iron tracer data

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:6959155

Yamada, T; Bunker, S

Extensive field experiments were conducted during 1965 and 1966 near Vandenberg Air Force Base. The experiments included wind speed and wind direction measurements at several towers, upper air soundings by radiosondes, and fluorescent particle releases to characterize the diffusion processes. The data provide a unique opportunity to test numerical models under realistic boundary conditions: land-sea contrast and complex topography. We used HOTMAC (High Order Turbulence Model for Air Circulations), a three-dimensional mesoscale model based on simplified turbulence-closure equations to simulate temporal and spatial variations of wind, temperature, mixing ratio of water vapor, and turbulence distributions. Surface concentrations were computed by using a three-dimensional transport and diffusion model RAPTAD (Random Puff Transport and Diffusion). RAPTAD is a Lagrangian puff code based on the Monte Carlo statistical diffusion process. The center location and standard deviation of concentration distribution for each puff are computed by using wind and turbulence modeled by HOTMAC. Then, the concentration at any location is computed by summing concentrations contributed by all the puffs. The purpose of this study is to simulate the transport and dispersion of atmospheric pollutants in the complex terrain surroundings at Vandenberg Air Force Base by using the Los Alamos national Laboratory (LANL) atmospheric models HOTMAC and RAPTAD.

• Research Organization: Los Alamos National Lab., NM (USA)
• Sponsoring Organization: DOD
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6959155
• Report Number(s): LA-UR-90-1332; CONF-900435--1; ON: DE90009749
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540110*
CALIFORNIA
CHALCOGENIDES
COMPLEX TERRAIN
DIFFUSION
ENVIRONMENTAL TRANSPORT
EQUATIONS
FEDERAL REGION IX
FIELD TESTS
FLUIDS
FUNCTIONS
GASES
INORGANIC PHOSPHORS
LAGRANGIAN FUNCTION
MASS TRANSFER
MATHEMATICAL MODELS
MONTE CARLO METHOD
NORTH AMERICA
PARTICLES
PARTICULATES
PHOSPHORS
PLUMES
PREDICTION EQUATIONS
SULFIDES
SULFUR COMPOUNDS
TESTING
THREE-DIMENSIONAL CALCULATIONS
TURBULENCE
USA
VAPORS
WATER VAPOR
WIND
ZINC COMPOUNDS
ZINC SULFIDES