Abstract
It is well known that the radionuclides which are released into the atmosphere after a nuclear accident will have serious impact on the environment and residents. As a result, it is important to research the diffusion and deposition process of releasing radionuclides. At present, there have been already some researches on the atmospheric diffusion of radionuclides in inland environment. However, the research on atmospheric diffusion of radionuclides in the marine environment is still lacking. In fact, there are some differences between the atmospheric diffusion of radionuclides in the marine environment and in inland environment. Because of the surrounding sea areas, the capture of radionuclides by seawater and sea waves have important impact on the diffusion process. Moreover, the turbulence transport near sea surface affect also the diffusion process. In the inland case, the Gaussian plume model is usually used to evaluate rapidly the distribution of nuclides. So in order to make the atmospheric diffusion calculation model suitable for the marine environment, this paper revised the Gaussian plume model by taking account of the influence of absorption of seawater, sea waves and the influence of turbulence transport. Then the model modified was analyzed, and the results show that sea surface absorption and the turbulence transport have influences on the distribution of aerosol. The proposed new modified model may improve the calculation accuracy and may better meet the true atmospheric diffusion in ocean environment.
