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<p>Multiple nuclear power plants are distributed in the Beibu Gulf of the South China Sea, and simulating the transport and diffusion of nearshore radioactive nuclides is crucial for environmental risk assessment. On the basis of hydrometeorological data, in this study, a 3D tidal current numerical model for the Beibu Gulf was developed using the Finite Volume Community Ocean Model (FVCOM). By incorporating the random walk and decay effects of nuclide particles, improved Lagrangian and Eulerian nuclide transport and diffusion models were further established. The numerical simulation results are highly consistent with the observational data, verifying the reliability of the models. Model analysis reveals the following findings: The improved Eulerian model reveals that nuclides released in summer significantly affect the northeastern Beibu Gulf and the Qiongzhou Strait but have a minor effect on the southern waters of the gulf. Additionally, the concentrations of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(^{3}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mn>3</mn> </mmultiscripts> </math></EquationSource> </InlineEquation>H (tritium) at monitoring stations exhibit sinusoidal fluctuations with tidal ebb and flow. The improved Lagrangian model indicates that nuclide particles, driven by tidal currents, migrate northwards close to the coastline. These particles take a long time to reach the northern Beibu Gulf and the Qiongzhou Strait, and the migration process is accompanied by complex phenomena, such as circular and reverse movements. These results provide a scientific basis for the prevention and control of nuclide pollution and environmental management in the nearshore areas of nuclear power plants in the Beibu Gulf.</p>

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Research on radionuclide transport and diffusion in coastal waters using improved Lagrangian and Eulerian models

  • 期刊论文

  • 发表日期：

    2026年5月5日

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  • Yangxin Zhang,
  • Jiangmei Zhang,
  • Xinghua Feng,
  • Haolin Liu,
  • Guowei Yang,
  • Yongzhuo Liu

摘要

Multiple nuclear power plants are distributed in the Beibu Gulf of the South China Sea, and simulating the transport and diffusion of nearshore radioactive nuclides is crucial for environmental risk assessment. On the basis of hydrometeorological data, in this study, a 3D tidal current numerical model for the Beibu Gulf was developed using the Finite Volume Community Ocean Model (FVCOM). By incorporating the random walk and decay effects of nuclide particles, improved Lagrangian and Eulerian nuclide transport and diffusion models were further established. The numerical simulation results are highly consistent with the observational data, verifying the reliability of the models. Model analysis reveals the following findings: The improved Eulerian model reveals that nuclides released in summer significantly affect the northeastern Beibu Gulf and the Qiongzhou Strait but have a minor effect on the southern waters of the gulf. Additionally, the concentrations of \(^{3}\) 3 H (tritium) at monitoring stations exhibit sinusoidal fluctuations with tidal ebb and flow. The improved Lagrangian model indicates that nuclide particles, driven by tidal currents, migrate northwards close to the coastline. These particles take a long time to reach the northern Beibu Gulf and the Qiongzhou Strait, and the migration process is accompanied by complex phenomena, such as circular and reverse movements. These results provide a scientific basis for the prevention and control of nuclide pollution and environmental management in the nearshore areas of nuclear power plants in the Beibu Gulf.