Study on flow and turbulence characteristics measured by an on-site meteorological station at a nuclear facility for a real-time atmospheric dispersion simulation

We have been developing a practical and quick high-resolution atmospheric dispersion simulation model for radioactive plumes monitoring in the vicinity of nuclear facilities. This framework is composed of large-eddy simulation precalculated database of three-dimensional distributions of wind velocities and on-site meteorological observations at a stationary point. The LES-database was created under the assumption of a neutral atmospheric stability condition from a practical point of view. Since atmospheric dispersion behaviors of a plume released from a stack are sensitively influenced by atmospheric stability, the thermal effects should be incorporated into the LES-database. In this study, we first analyzed half-a-year meteorological data of turbulence intensity and atmospheric stability at the target nuclear facility, and then investigated the turbulence intensities under different atmospheric thermal stability conditions for improving the framework of the real-time high-resolution atmospheric dispersion simulation.