Abstract
The height of mechanical mixing layer is one of the parameters of the safety analysis report of any nuclear facility due to its relation to the dispersion factor of pollutants. It can provide information about lower atmospheric dispersion, which is usually used to study the pollutants released from nuclear facility, risk analysis and emergency planning. The height of mixing layer is difficult to be measured; therefore, mathematical methods are introduced to calculate the height of this layer. Different Fortran Programs have been developed to calculate the Monin-Obukhov length, universal stability function and the friction velocity; these parameters are used to calculate the height of mechanical mixing layer. The analysis of the results showed that the variation of the height of the mechanical mixing layer for different seasons depends on the stability condition and wind speed, where the height of the mechanical mixing layer equals 2433 m at wind speed of 14.5m/s, 1952m at wind speed of 14m/s and 1700m at wind speed of 13m/s. The purpose of this work is concerned to calculate the height of mechanical mixing layer (HABL) mech. by several models during stable/neutral conditions, because this value is one of the key parameter of the safety analysis report of any nuclear facility and important in the prediction of pollutants concentration released from any nuclear facility and the scaling of turbulence.