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Steve R. Diehl, Donald A. Burrows, Eric A. Hendricks, and Robert Keith

Lagrangian tracer model overview To model transport and dispersion of contaminants, RUSTIC flow and turbulence fields are passed to MESO, which is based on Lagrangian tracer techniques. MESO has been primarily sponsored by the Naval Surface Warfare Center Dahlgren Division for general-purpose “rural” transport and dispersion applications and can ingest 3D forecast predictions. For nonurban dispersion predictions, MESO contains a sophisticated convective boundary layer model and uses the stochastic

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Eric A. Hendricks, Steve R. Diehl, Donald A. Burrows, and Robert Keith

the simulations presented in this paper are β = 0.072, β * = 0.09, σ = 0.5, σ * = 0.5, and α = 0.52 ( Wilcox 1998 ). MESO is a mesoscale Lagrangian particle-based transport and diffusion code. For plumes, it uses random-walk techniques ( Diehl et al. 1982 ) for vertical dispersion and Langevin techniques ( van Dop et al. 1985 ) for horizontal dispersion. The random-walk techniques are used because they are numerically fast in comparison with other stochastic techniques. For clouds (or

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M. A. Nelson, E. R. Pardyjak, M. J. Brown, and J. C. Klewicki

tower (OU1–5) located at ground level near the center of the street canyon (see Figs. 1 and 2 ), the three sonics on the University of Utah tower (UU1–3) located on the roof of the 17-m building north of the OU towers (see Figs. 1 and 3 ), and the Los Alamos National Laboratory (LANL) sonic located on the southwest corner of the roof of the building on the northeast corner of PA (see Figs. 1 and 2 ). 3. Data analysis techniques a. Data selection The same time periods used to investigate the

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Donald A. Burrows, Eric A. Hendricks, Steve R. Diehl, and Robert Keith

. Model equations RUSTIC uses a finite-volume technique to solve the Reynolds-averaged Navier–Stokes equations. To reduce the number of equations to be solved in the model, the continuity equation is combined with the thermodynamic energy equation to obtain a pressure tendency equation: The nonhydrostatic perturbation pressure is P ′ and U is the three-dimensional velocity vector, c is the speed of sound, C p is the specific heat for constant pressure, and ρ is the mean air density, which is

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