Estimation of the Concentration Distribution according to the Variations in a Wind Field over a Complex Terrain

A three-dimensional wind field and an atmospheric dispersion model have been developed for real-time accident generation of a wind field over the whole domain using several measured data. A Lagrangian particle model was used for the calculation of the concentration distribution of the radionuclides in the atmosphere. The field tracer experiment near the Younggwang nuclear power plant was carried out for the purpose of analyzing the site-specific environmental characteristics and validating the atmospheric dispersion model in May 1996. The calculated concentration the most important factors for calculating the concentration of the released particles in the dispersion model. Several numerical experiments using the measured wind data were performed to get more accurate concentration distributions compared with the results of the field tracer experiment of SF6. The developed numerical models are being used as a basic tool for emergency preparedness in Korea.