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首页> 外文期刊>Environmental Science & Technology >Vertical and Lateral Transport of Particulate Radiocesium off Fukushima
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Vertical and Lateral Transport of Particulate Radiocesium off Fukushima

机译：福岛附近颗粒状放射性铯的垂直和横向运输

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摘要

Transport processes of particulate radiocesium were investigated using a sediment trap deployed at about 100 km east of the Fukushima Daiichi Nuclear Power Plant. A sediment trap was installed at 873 m depth of the station (119 m above the bottom), and time-series sampling of sinking particles was carried out from August, 2011 to June, 2013. The accident-derived radiocesium was detected from sinking particles over two years after the accident. Observed ~(137)Cs flux was highest in September 2011 (98 mBq m~(-2) day~(-1): decay-corrected to March 11, 2011), and decreased over time with seasonal fluctuations. Particulate fluxes of radiocesium were mainly affected by two principal processes. One was the rapid sinking of radiocesium-bound particles (moderate mode). This mode was dominant especially in the early postaccident stage, and was presumed to establish the distribution of radiocesium in the offshore seabed. Another mode was observed in winter, and secondary transport of particles attributed to turbulence near the seabed increased fluxes of particulate radiocesium (turbulence mode). Although the latter process would not drastically change the distribution of sedimentary radiocesium in the short term, attention should be paid as this key process redistributing the accident-derived radiocesium may cumulatively affect the long-term distribution.
机译：使用沉积在福岛第一核电站以东约100公里处的沉积物捕集阱，研究了放射性radio的运输过程。在站深873 m（底部上方119 m）处安装了一个泥沙收集器，并从2011年8月至2013年6月对沉没颗粒进行了时间序列采样。从沉没颗粒中检测到了事故源放射性铯事故发生两年后观测到的〜（137）Cs通量在2011年9月最高（98 mBq m〜（-2）天〜（-1）：衰减校正至2011年3月11日），并随着时间的推移随着时间的推移而降低。放射性铯的颗粒通量主要受两个主要过程影响。一种是放射性铯结合的粒子快速下沉（中度模式）。这种模式尤其在事故后早期占主导地位，并被认为可以建立近海海床中放射性铯的分布。在冬季观察到另一种模式，归因于海床附近湍流的颗粒的二次运输增加了微粒放射性铯的通量（湍流模式）。尽管后一过程在短期内不会显着改变沉积放射性铯的分布，但应注意，因为重新分配事故源放射性铯的这一关键过程可能会累积影响长期分布。

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  • 来源
    《Environmental Science & Technology》 |2014年第21期|12595-12602|共8页
  • 作者

    Shigeyoshi Otosaka; Takahiro Nakanishi; Takashi Suzuki; Yuhi Satoh; Hisashi Narita;

  • 作者单位

    Research Group for Environmental Science, Japan Atomic Energy Agency, 2-4 Shiraka-Shirane, Tokai-mura, Ibaraki 319-1195, Japan;

    Fukushima Environmental Research Group, Japan Atomic Energy Agency, 1-29 Okitama-cho, Fukushima-shi, Fukushima 960-8034, Japan;

    Research Group for Environmental Science, Japan Atomic Energy Agency, 2-4 Shiraka-Shirane, Tokai-mura, Ibaraki 319-1195, Japan;

    Research Group for Environmental Science, Japan Atomic Energy Agency, 2-4 Shiraka-Shirane, Tokai-mura, Ibaraki 319-1195, Japan;

    School of Marine Science and Technology, Tokai University, Shimizu-ku, Shizuoka 424-8610, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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