Importance of desorption process from Abukuma River's suspended particles in increasing dissolved 137Cs in coastal water during river-flood caused by typhoons

Takata, Hyoe; Wakiyama, Yoshifumi; Niida, Takuya; Igarashi, Yasunori; Konoplev, A.; Inatomi, Naohiko

doi:10.1016/j.chemosphere.2021.130751

Cited by 16 publications

(4 citation statements)

References 43 publications

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“…Otosaka [2] estimated that 80% of this value existed in the coastal areas shallower than 100 m. These results indicate that the total sedimentary 137 Cs in the coastal areas off Fukushima was 80-240 TBq as of October 2011. Based on a laboratory experiment, Takata [23] estimated that the 137 Cs desorbed by seawater from suspended sediment in the river was 5.5-11%. The calculated 137 Cs supply to the ocean between October 2011 and December 2040 was 35.5-37.7 TBq based on the desorption rate, and 76.6% of the 137 Cs supply from the rivers was settled on the coastal areas based on Uchiyama et al [9].…”

Section: Overall Evaluation Of the Fukushima Coastal River Basinsmentioning

confidence: 99%

“…Several studies have estimated the 137 Cs supply from the Abukuma and Fukushima coastal rivers to the ocean [12][13][14][15][17][18][19][20][21][22][23][24]. However, none of them conducted a long-term prediction of the 137 Cs supply from the Fukushima coastal rivers to the ocean, considering the decontamination work and the resumption of agriculture.…”

Section: Introductionmentioning

confidence: 99%

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Thirty-Year Prediction of 137Cs Supply from Rivers to Coastal Waters off Fukushima Considering Human Activities

Ikenoue

Shimadera

Nakanishi

et al. 2023

Water

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The Fukushima Daiichi Nuclear Power Plant accident caused an accumulation of 137Cs in coastal sediment. The 137Cs supply from rivers to the ocean can affect the long-term fate of 137Cs in coastal sediment. Since the Fukushima coastal river basins include large decontaminated and evacuation order areas, considering the decontamination work and resumption of agriculture is important for predicting the 137Cs supply. We conducted a 30-year prediction of the 137Cs supply from the Fukushima coastal rivers to the ocean using a distributed radiocesium prediction model, considering the effects of human activities. In river basins with decontaminated and evacuation order areas, human activities reduced the total 137Cs outflow from agricultural lands, urban lands, and forest areas to the rivers and the 137Cs supply to the ocean by 5.0% and 6.0%, respectively. These results indicated that human activities slightly impacted the 137Cs outflow and supply. The 137Cs supply from rivers impacted by the accident to the coastal sediment was estimated to correspond to 11–36% of the total 137Cs in the coastal sediment in the early phase of the accident. Therefore, the 137Cs supply from rivers to the ocean is important for the long-term behavior of 137Cs in coastal sediment.

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Section: Overall Evaluation Of the Fukushima Coastal River Basinsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thirty-Year Prediction of 137Cs Supply from Rivers to Coastal Waters off Fukushima Considering Human Activities

Ikenoue

Shimadera

Nakanishi

et al. 2023

Water

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“…Annual precipitation also markedly differs and is more than two times higher in the FDNPP area (1420 mm) [ 11 ] than at Chernobyl (625 mm) [ 8 , 9 ]. Moreover, in the Fukushima region, high flow events in rivers occur especially during the typhoon season, which is conducive for radionuclide wash-off from contaminated catchments and its lateral migration [ 12 , 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Fukushima and Chernobyl: Similarities and Differences of Radiocesium Behavior in the Soil–Water Environment

Konoplev

2022

Toxics

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In the wake of Chernobyl and Fukushima accidents, radiocesium has become a radionuclide of most environmental concern. The ease with which this radionuclide moves through the environment and is taken up by plants and animals is governed by its chemical forms and site-specific environmental characteristics. Distinctions in climate and geomorphology, as well as 137Cs speciation in the fallout, result in differences in the migration rates of 137Cs in the environment and rates of its natural attenuation. In Fukushima areas, 137Cs was strongly bound to soil and sediment particles, with its bioavailability being reduced as a result. Up to 80% of the deposited 137Cs on the soil was reported to be incorporated in hot glassy particles (CsMPs) insoluble in water. Disintegration of these particles in the environment is much slower than that of Chernobyl-derived fuel particles. The higher annual precipitation and steep slopes in Fukushima-contaminated areas are conducive to higher erosion and higher total radiocesium wash-off. Among the common features in the 137Cs behavior in Chernobyl and Fukushima are a slow decrease in the 137Cs activity concentration in small, closed, and semi-closed lakes and its particular seasonal variations: increase in the summer and decrease in the winter.

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“…The main processes governing Cs activity concentration after the accident can be categorized into an initial phase and mid-, to long-term phases, corresponding to the post-accident phase. The most important processes in the initial phase are the atmospheric fallout of Cs on the water surface, subsequent sorption and fixation by sediments, and their settling on the bottom 13 – 15 . Besides pure fitting, a parameter for a given lake and radionuclide in the diffusion model can be estimated using characteristics with clear meaning Cs deposition, effective diffusion coefficient, and distribution coefficient 11 , and thus predictions of Cs long-term dynamics in a lake can be provided immediately after the accident using previously measured values of the characteristics, literature data or expert judgments.…”

Section: Introductionmentioning

confidence: 99%

Long-term prediction of $$^{137}$$Cs in Lake Onuma on Mt. Akagi after the Fukushima accident using fractional diffusion model

Suetomi

Hatano

Fujita

et al. 2021

Sci Rep

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The Fukushima Daiichi Nuclear Power Plant accident also contaminates lakes in Japan. Especially in closed lakes, there is a problem of prolonged low-level $$^{137}$$ 137 Cs contamination because the activity concentration of $$^{137}$$ 137 Cs declines sharply immediately after the accident, but then begins to decrease slowly. In this paper, we derived a long-term prediction formula based on the fractional diffusion model (FDM) for the temporal variation in $$^{137}$$ 137 Cs activity concentrations of the water in Lake Onuma on Mt. Akagi, one of the closed lakes, and of pond smelt (Hypomesus nipponensis), a typical fish species inhabiting in the lake. The formula reproduced well the measured $$^{137}$$ 137 Cs activity concentration of the lake water and pond smelt for 5.4 years after the accident. Next, we performed long-term prediction for 10,000 days using this formula and compared it with the prediction results of the two-component decay function model (TDM), which is the most common model. The results suggest that the FDM prediction will lead to a longer period of contamination with low-level $$^{137}$$ 137 Cs than the TDM prediction.

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Importance of desorption process from Abukuma River's suspended particles in increasing dissolved 137Cs in coastal water during river-flood caused by typhoons

Cited by 16 publications

References 43 publications

Thirty-Year Prediction of 137Cs Supply from Rivers to Coastal Waters off Fukushima Considering Human Activities

Thirty-Year Prediction of 137Cs Supply from Rivers to Coastal Waters off Fukushima Considering Human Activities

Fukushima and Chernobyl: Similarities and Differences of Radiocesium Behavior in the Soil–Water Environment

Long-term prediction of $$^{137}$$Cs in Lake Onuma on Mt. Akagi after the Fukushima accident using fractional diffusion model

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