Abstract
A concept is presented in which wind tunnel tests are used for determining the transmission function for the transmission of accidentally released gases from chemical plants. The flow field downstream from the release is divided into three regions. The first is the region of release, in which the source characteristics in conjunction with the characteristics of the flow field surrounding the source determine the dispersion of the spill, the second is the “near field” region, in which the local characteristics of the plant and its surroundings, but not the mode of release determine the spreading, and the third is the “far field” region in which the ground is characterized by an uniform roughness and the release by a simple (for example Gaussian) diffusion model. Some new experimental data are presented to illustrate the effect of the “near field” on the dispersion process.
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