Sediment and Radioactivity Transport in the Bohai, Yellow, and East China Seas: A Modeling Study

Journal of Marine Science and Engineering

Roman Bezhenar¹  Igor Brovchenko¹  Vladimir Maderich¹  Joo Hyung Ryu²  Kyeong Ok Kim³  Kyung Tae Jung⁴  Jee Eun Min⁵ 

[1] Department of Marine and River System Modelling, Institute of Mathematical Machine and System Problems, 03187 Kyiv, Ukraine;Korea Ocean Satellite Centre, Korea Institute of Ocean Science & Technology, Busan 49111, Korea;Marine Environmental Research Center, Korea Institute of Ocean Science and Technology, Busan 49111, Korea;Oceanic Consulting and Trading, Gangneung 25601, Korea;Underwater Survey Technology 21, Incheon 21999, Korea;

关键词: sediment transport;    radioactivity transport;    SELFE;    Bohai Sea;    Yellow Sea;    East China Sea;   

DOI  :  10.3390/jmse10050596

来源: DOAJ

【 摘 要 】

This paper is concerned with the development of a radionuclide dispersion model for the nuclear power plants in the Bohai, Yellow, and East China seas (BYECS) characterized by high turbidity and multi-scale circulations, focusing on the comparison of dispersion processes of ¹³⁷Cs depending upon, in particular, the suspended sediment concentration and erosion/sedimentation processes. The simulations were carried out using a multi-fraction sediment transport model embedded in the semi-implicit Eulerian–Lagrangian finite-element coupled wave-circulation model linked with the model of radionuclide transport, which describes the key radionuclide transfer processes in the system of water–multi-fraction sediments. In contrast to the Eulerian models used for hydrodynamics and sediment transport processes, the Lagrangian technique was applied to simulate the transport of radionuclides. The simulation results for total suspended concentration agreed with in situ measurements and the Geostationary Ocean Color Imager data. The results of the simulation of hypothetical releases of ¹³⁷Cs from four nuclear power plants (NPPs) placed in BYECS essentially differ from the real release of activity in the Pacific Ocean shelf due to the Fukushima Daiichi accident, which took place at the same time and released activity that was similar. The total amount of bottom contamination of ¹³⁷Cs in releases from the Sanmen, Hanbit, and Hongyanhe NPPs was about 40% of dissolved component, and the total amount of suspended component was about 20% of dissolved component, in contrast with the Fukushima Daiichi accident, where the particulate component was only 2%. The results demonstrate the importance of erosion processes in the budget of ¹³⁷Cs in shallow areas around the Sanmen and Hanbit NPPs, where strong wind and tidal currents took place.

【 授权许可】

Unknown