Thirty-Year Prediction of <sup>137</sup>Cs Supply from Rivers to Coastal Waters off Fukushima Considering Human Activities
The Fukushima Daiichi Nuclear Power Plant accident caused an accumulation of <sup>137</sup>Cs in coastal sediment. The <sup>137</sup>Cs supply from rivers to the ocean can affect the long-term fate of <sup>137</sup>Cs in coastal sediment. Since the Fukushima coast...
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| Language: | English |
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MDPI AG
2023-07-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/15/15/2734 |
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| author | Tsubasa Ikenoue Hikari Shimadera Takahiro Nakanishi Akira Kondo |
| author_facet | Tsubasa Ikenoue Hikari Shimadera Takahiro Nakanishi Akira Kondo |
| author_sort | Tsubasa Ikenoue |
| collection | DOAJ |
| description | The Fukushima Daiichi Nuclear Power Plant accident caused an accumulation of <sup>137</sup>Cs in coastal sediment. The <sup>137</sup>Cs supply from rivers to the ocean can affect the long-term fate of <sup>137</sup>Cs 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 <sup>137</sup>Cs supply. We conducted a 30-year prediction of the <sup>137</sup>Cs 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 <sup>137</sup>Cs outflow from agricultural lands, urban lands, and forest areas to the rivers and the <sup>137</sup>Cs supply to the ocean by 5.0% and 6.0%, respectively. These results indicated that human activities slightly impacted the <sup>137</sup>Cs outflow and supply. The <sup>137</sup>Cs supply from rivers impacted by the accident to the coastal sediment was estimated to correspond to 11–36% of the total <sup>137</sup>Cs in the coastal sediment in the early phase of the accident. Therefore, the <sup>137</sup>Cs supply from rivers to the ocean is important for the long-term behavior of <sup>137</sup>Cs in coastal sediment. |
| first_indexed | 2024-03-11T00:13:56Z |
| format | Article |
| id | doaj.art-d8d4098618c0492eafe96661f688139b |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-11T00:13:56Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-d8d4098618c0492eafe96661f688139b2023-11-18T23:46:59ZengMDPI AGWater2073-44412023-07-011515273410.3390/w15152734Thirty-Year Prediction of <sup>137</sup>Cs Supply from Rivers to Coastal Waters off Fukushima Considering Human ActivitiesTsubasa Ikenoue0Hikari Shimadera1Takahiro Nakanishi2Akira Kondo3Nuclear Science Research Institute, Japan Atomic Energy Agency, Ibaraki 319-1195, JapanDivision of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, Suita Campus, Yamadaoka 2-1, Osaka 565-0871, JapanNuclear Science Research Institute, Japan Atomic Energy Agency, Ibaraki 319-1195, JapanDivision of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, Suita Campus, Yamadaoka 2-1, Osaka 565-0871, JapanThe Fukushima Daiichi Nuclear Power Plant accident caused an accumulation of <sup>137</sup>Cs in coastal sediment. The <sup>137</sup>Cs supply from rivers to the ocean can affect the long-term fate of <sup>137</sup>Cs 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 <sup>137</sup>Cs supply. We conducted a 30-year prediction of the <sup>137</sup>Cs 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 <sup>137</sup>Cs outflow from agricultural lands, urban lands, and forest areas to the rivers and the <sup>137</sup>Cs supply to the ocean by 5.0% and 6.0%, respectively. These results indicated that human activities slightly impacted the <sup>137</sup>Cs outflow and supply. The <sup>137</sup>Cs supply from rivers impacted by the accident to the coastal sediment was estimated to correspond to 11–36% of the total <sup>137</sup>Cs in the coastal sediment in the early phase of the accident. Therefore, the <sup>137</sup>Cs supply from rivers to the ocean is important for the long-term behavior of <sup>137</sup>Cs in coastal sediment.https://www.mdpi.com/2073-4441/15/15/2734<sup>137</sup>Cs transportsediment transportFukushima nuclear accidentlong-term simulationdecontaminationresumption of agriculture |
| spellingShingle | Tsubasa Ikenoue Hikari Shimadera Takahiro Nakanishi Akira Kondo Thirty-Year Prediction of <sup>137</sup>Cs Supply from Rivers to Coastal Waters off Fukushima Considering Human Activities Water <sup>137</sup>Cs transport sediment transport Fukushima nuclear accident long-term simulation decontamination resumption of agriculture |
| title | Thirty-Year Prediction of <sup>137</sup>Cs Supply from Rivers to Coastal Waters off Fukushima Considering Human Activities |
| title_full | Thirty-Year Prediction of <sup>137</sup>Cs Supply from Rivers to Coastal Waters off Fukushima Considering Human Activities |
| title_fullStr | Thirty-Year Prediction of <sup>137</sup>Cs Supply from Rivers to Coastal Waters off Fukushima Considering Human Activities |
| title_full_unstemmed | Thirty-Year Prediction of <sup>137</sup>Cs Supply from Rivers to Coastal Waters off Fukushima Considering Human Activities |
| title_short | Thirty-Year Prediction of <sup>137</sup>Cs Supply from Rivers to Coastal Waters off Fukushima Considering Human Activities |
| title_sort | thirty year prediction of sup 137 sup cs supply from rivers to coastal waters off fukushima considering human activities |
| topic | <sup>137</sup>Cs transport sediment transport Fukushima nuclear accident long-term simulation decontamination resumption of agriculture |
| url | https://www.mdpi.com/2073-4441/15/15/2734 |
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