南海中尺度海域低放废水数值模拟研究

低放废水的排放一直是国内外关注的问题,目前国内多数研究采用小尺度海域模拟短期低放废水排放后的迁移扩散状况。以南海中尺度海域为例,采用MIKE模拟软件,分析南海中尺度海域的潮汐特征,模拟计算低放废水长期排放后的浓度场分布规律。研究表明:放射性核素氚的浓度场分布情况主要受到潮流场、余流的影响,雷州半岛东部低放废水排放情形下,放射性核素环抱于雷州半岛,并在北部湾迁移扩散,主要流向为西北和西南向;雷州半岛西部排放的主要流向为西北和西南向。就东西部低放废水排放比较而言,西部排放更加有利于低放废水的稀释扩散,排放口附近海域氚的浓度活度较高,对海洋环境敏感目标影响较小。

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

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.