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首页> 外文期刊>Scientific reports. >Renewed soil erosion and remobilisation of radioactive sediment in Fukushima coastal rivers after the 2013 typhoons
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Renewed soil erosion and remobilisation of radioactive sediment in Fukushima coastal rivers after the 2013 typhoons

机译：2013年台风过后，福岛沿海河流水土流失重新恢复，放射性沉积物迁移

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摘要

Summer typhoons and spring snowmelt led to the riverine spread of continental Fukushima fallout to the coastal plains of Northeastern Japan and the Pacific Ocean. Four fieldwork campaigns based on measurement of radioactive dose rates in fine riverine sediment that has recently deposited on channel bed-sand were conducted between November 2011 and May 2013 to document the spread of fallout by rivers. After a progressive decrease in the fresh riverine sediment doses rates between 2011 and early spring in 2013, a fifth campaign conducted in November 2013 showed that they started to increase again after the occurrence of violent typhoons. We show that this increase in dose rates was mostly due to remobilization of contaminated material that was temporarily stored in river channels or, more importantly, in dam reservoirs of the region during the typhoons. In addition, supply of particles from freshly eroded soils in autumn 2013 was the most important in areas where decontamination works are under progress. Our results underline the need to monitor the impact of decontamination works and dam releases in the region, as they may provide a continuous source of radioactive contamination to the coastal plains and the Pacific Ocean during the coming years.
机译：夏季的台风和春季的融雪导致福岛大陆辐射的河流扩散到日本东北部和太平洋的沿海平原。在2011年11月至2013年5月之间，开展了四次野外调查活动，以测量河道细沙中最近沉积的细河沉积物中的放射性剂量率为基础，以记录河水扩散的情况。在2011年至2013年春季新鲜河流沉积物剂量率逐渐下降之后，2013年11月进行的第五次运动表明，台风发生后，它们又开始增加。我们表明剂量率的增加主要是由于台风期间临时存储在河道或更重要的是该地区大坝水库中的污染物质的迁移。此外，在正在进行净化工作的地区，2013年秋季来自新鲜侵蚀土壤的颗粒供应最为重要。我们的结果强调需要监测去污工程和大坝释放在该地区的影响，因为它们可能在未来几年内为沿海平原和太平洋提供连续的放射性污染源。

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