Meso-scale numerical analysis for transport and deposition behaviors of radioactive aerosols under severe nuclear accident

Radioactive aerosols would be released to the atmosphere during severe nuclear accidents. Depending on local meteorological condition, aerosols would be transported to downwind area of nuclear site and fell to the ground simultaneously. Such behaviors may cause heavy contamination to the environment, and even bring damage to local residents. Therefore, theoretical study for aerosols transport and deposition is very meaningful in severe nuclear accident research. In the present study, calculation method for 3D aerosols transport and deposition simulation was established based on WRF-CMAQ model. Datasets for meteorological field would be acquired by WRF for aerosols transport simulation. Besides, to perform parameterization for aerosols source term, self-compiled module RAMS was applied to create source term file. Based on such calculation method, transport and deposition for aerosols can be simulated numerically, distribution for aerosols concentration, aerosols deposition flux and contaminated area were analyzed in detail. Besides, different monitoring locations were selected for parameter comparison. The present theoretical research for aerosols transport and deposition simulation is essential for nuclear accident research and will lay a solid foundation for safety assessment and aftermath evaluation.