1985 Volume 20 Issue 3 Pages 158-167
A practical method to consider an internal boundary layer (IBL) was developed to simulate the atmospheric dispersion of airborne effluent from a nuclear power plant which is located in the coastal region. This model consists of a mass-consistent wind field model with a variational method and a random-walk model to solve an advection-diffusion equation numerically. A modeling of IBL is performed by a set of three vertical turbulence layers which are equivalent to a completely adjusted layer to the ground, a transition layer whose turbulence is intermediate and a stable layer above IBL. The difference of three turbulence layers is characterized by horizontal and vertical diffusivities.
For the validation, calculated results were compared with field tracer experiments performed in Tokai-mura, Ibaraki-ken, Japan and the results showed that this model could present the fumigation well. As another validation, this model was compared with Ryons and Cole model which was often used as a fumigation model.
