Contribution of radioactive 137Cs discharge by suspended sediment, coarse organic matter, and dissolved fraction from a headwater catchment in Fukushima after the Fukushima Dai-ichi Nuclear Power Plant accident
Contribution of radioactive 137Cs discharge by suspended sediment, coarse organic matter, and dissolved fraction from a headwater catchment in Fukushima after the Fukushima Dai-ichi Nuclear Power Plant accident
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DOI：
10.1016/j.jenvrad.2016.07.025
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发表时间：
2017-01-01
影响因子：
2.3
通讯作者：
Abe, Yutaka
中科院分区：
文献类型：
--
作者：
Iwagami, Sho;Onda, Yuichi;Abe, Yutaka
放射性铯（Cs-137）从森林地区的源头迁移提供了重要的信息，因为森林溪流的产出随后进入各种土地使用区和下游河流。因此，它是重要的，以确定的组成Cs-137通量（溶解部分，悬浮泥沙，或粗有机物）迁移通过河源流。在这项研究中，Cs-137排放的悬浮泥沙和粗有机质从森林水源集水区进行了监测。2012年8月至2013年9月，在地震海啸灾害发生后，对位于福岛第一核电站（FDNPP）西北方向-35 km处的山屋区3个水源集水区的河流进行了悬浮泥沙和粗有机物（如树叶和树枝）中Cs-137浓度的测定，并对河流中悬浮泥沙和粗有机物的含量进行了分析。悬浮沉积物和粗有机物的取样间隔约为1-2个月。悬浮泥沙和粗有机质中~（137）Cs浓度分别为2.4 ~ 49 kBq/kg和0.85 ~ 14 kBq/kg。悬浮泥沙中Cs-137浓度与流域平均沉积密度密切相关。悬浮泥沙、粗有机质和溶解态对Cs-137排放的贡献率分别为96- 99%、0.0092- 0.069%和0.73- 3.7%。从集水区的总的年Cs-137排放量为0.02-0.3%的沉积。(C)2016爱思唯尔有限公司版权所有
Radiocesium (Cs-137) migration from headwaters in forested areas provides important information, as the output from forest streams subsequently enters various land-use areas and downstream rivers. Thus, it is important to determine the composition of Cs-137 fluxes (dissolved fraction, suspended sediment, or coarse organic matter) that migrate through a headwater stream. In this study, the Cs-137 discharge by suspended sediment and coarse organic matter from a forest headwater catchment was monitored. The Cs-137 concentrations in suspended sediment and coarse organic matter, such as leaves and branches, and the amounts of suspended sediment and coarse organic matter were measured at stream sites in three headwater catchments in Yamakiya District, located-35 km northwest of Fukushima Dai-ichi Nuclear Power Plant (FDNPP) from August 2012 to September 2013, following the earthquake and tsunami disaster. Suspended sediment and coarse organic matter were sampled at intervals of approximately 1-2 months. The Cs-137 concentrations of suspended sediment and coarse organic matter were 2.4-49 kBq/kg and 0.85-14 kBq/kg, respectively. The Cs-137 concentrations of the suspended sediment were closely correlated with the average deposition density of the catchment. The annual proportions of contribution of Cs-137 discharge by suspended sediment, coarse organic matter, and dissolved fraction were 96-99%, 0.0092-0.069%, and 0.73-3.7%, respectively. The total annual Cs-137 discharge from the catchment was 0.02-0.3% of the deposition. (C) 2016 Elsevier Ltd. All rights reserved.