Ak. Luhar et Bl. Sawford, AN EXAMINATION OF EXISTING SHORELINE FUMIGATION MODELS AND FORMULATION OF AN IMPROVED MODEL, Atmospheric environment, 30(4), 1996, pp. 609-620
We test assumptions and approximations used in existing coastal fumiga
tion models of varying complexity. Several fumigation cases involving
typical values of entrainment rate and plume spread at the interface o
f the plume and the thermal internal boundary layer (TIBL) are conside
red. It is observed that, when compared with the results from a physic
ally more realistic Lagrangian stochastic model, many existing models
that assume uniform and/or instantaneous vertical mixing in the TIBL g
ive inaccurate results for large entrainment rate and/or small vertica
l plume spread at the plume-TIBL interface. We develop an improved ana
lytical fumigation model based on a probability density function (PDF)
approach, with its parameters calculated using results from a stochas
tic model for the horizontally homogeneous convective boundary layer.
The new model is general and is capable of better representing the fum
igation process than the existing analytical models. A limited number
of field data support the model simulations for analogous input condit
ions.