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Meso-scale numerical simulation on low-level nuclear waste water in South China Sea

LIU Tuantuan;LIN Jianguo;YU Haiyuan;ZHU Jun;DENG Anchang;ZHANG Aiming;College of Environment,Dalian Maritime University;China Institute for Radiation Protection;  
Emission of low-level nuclear waste water is always a concern both at home and abroad. At present,most domestic simulations on migration and diffusion of low-level nuclear water are concentrated in small scale waters after short-term emission. In this paper,the MIKE simulation software is employed to analyze the tidal characteristics in the South China Sea and to simulate the distribution of the concentration field after long-term discharge of low-level nuclear waste water in a meso-scale.The concentration field of radionuclide tritium is mainly affected by tidal current and residual current. When the waste water discharges in the eastern part of the Leizhou Peninsula,the concentration field encircles the Leizhou Peninsula and migrates and spreads in the Beibu Gulf with the main flow direction of northwest and southwest; when tritium is emitted into the western area of the Leizhou Peninsula,the waste water mainly flows northwest and southwest. The comparison of tritium emissions in the eastern and western Leizhou Peninsula show that the western emission solution is more conducive to the dilution and spread of low nuclear waste water,and tritium activity concentration in the waters near the discharge port is higher,which has less impact on the sensitive targets of the marine environment.
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