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This paper presents some of the recent improvements introduced into regulatory dispersion models. The classical Pasquill-Gifford parameterisation of atmospheric turbulence is discarded in favour of similarity theory which relies on the definition of physical quantities that vary with continuity. The physician quantities can be determined from a few meteorological measurements. The dependence from these quantities of the turbulent parameters, such as dispersion coefficients and mixing layer depth, is also reported. A recent solution of the dispersion equation is also given that takes into account the finite emission duration.

Additional information

Authors: GRAZIANI G, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Radiation Protection in Neighbouring Countries in Central Europe, Portorose (SI)
Availability: Available from (1) as Paper EN 39255 ORA
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