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논문 기본 정보

자료유형
학술저널
저자정보
김해진 (한국해양과학기술원 해양순환기후연구부) 김한나 (한국해양과학기술원 해양순환기후연구부) 김경옥 (한국해양과학기술원)
저널정보
한국연안방재학회 한국연안방재학회지 한국연안방재학회지 제11권 제3호
발행연도
2024.9
수록면
47 - 57 (11page)

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This study, as a follow-up to the 137Cs study of Kim et al. (2023), performs a set of sensitivity experiments on ocean physical properties and sediment-related parameters based on initial bottom contamination of 90Sr and 239+240Pu in the upper sediment layer. Both studies utilizes the Extended BURN model proposed by Bezhenar et al. (2016). The initial contamination levels were set to 3 and 0.4 Bq/kg, respectively, based on observations off the coast of Fukushima. The sensitivity experiments were divided into EXP-WOHAD, which examined the effects of the vertical diffusion coefficient and vertical sediment flux, and EXP-WHAD, which investigated the effects of ocean currents. The results of the EXP-WOHAD experiments showed that both radionuclides are more sensitive to sediment fluxes than to vertical diffusion coefficients. For both 90Sr and 239+240Pu, transport was dominated by transport to the intermediate sediment layer rather than to seawater. Specifically, for 239+240Pu, transport to seawater was insignificant due to its strong sorption properties in sediments. In terms of bioaccumulation, 90Sr accumulated most in fish and invertebrates, while 239+240 Pu accumulated most in invertebrates, followed by zooplankton. Notably, 239+240Pu showed high bioaccumulation despite its low initial sediment contamination. The changes in radioactivity concentrations in the EXP-WHAD experiments were similar to those in the EXP-WOHAD experiments, and the bioaccumulation trends in biota were also comparable. This study confirms that the accumulation of radionuclides in seawater, intermediate sediments, and biota is sensitive to the marine physical environment and varies by nuclide. When the sediment flux increased by a factor of 100, the remaining radioactivity levels of 90Sr and 239+240Pu in biota after 100 years showed a significant reduction, decreasing by more than 900 and 30,000 times, respectively; it highlighting the importance of parameterization according to the physical environment of the area of interest.

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