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

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