DISTRIBUTIONS OF 210PB, 137CS AND PHYSICAL PROPERTIES IN BOTTOM SEDIMENTS OF WEST NANAO BAY, JAPAN
DISTRIBUTIONS OF 210PB, 137CS AND PHYSICAL PROPERTIES IN BOTTOM SEDIMENTS OF WEST NANAO BAY, JAPAN
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日本西七尾湾底部沉积物210PB、137CS分布及物理性质
DOI：
10.1093/rpd/ncac053
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发表时间：
2022
影响因子：
1
通讯作者：
Nagao Seiya
中科院分区：
文献类型：
--
作者：
Ochiai Shinya;Fujita Atsushi;Tokunari Takeo;Sakai Hideo;Nagao Seiya
基于日本西南澳湾海底沉积物的137cs和210pb分布、粒度和磁化率等特征，研究了沉积过程。这些放射性核素的地表沉积物浓度和库存量在海湾中部和东部地区相对较低，而在有几个主要河口的西部地区较高，表明河流输入的贡献仅影响西部地区。中东部地区137cs库存量远低于土壤库存量，过量210pb库存量与土壤库存量持平或更低。这些结果表明，在这些地区，去除效应强于积累效应（河流输入）。放射性核素的分布规律与结果一致，中东部地区颗粒尺寸较大，说明水流条件较强，细沙沉积较少。
This study revealed sedimentation processes based on137Cs and210Pb distribution, grain size and magnetic susceptibility of bottom sediments in West Nanao Bay, Japan. Surface sediment concentrations and inventories of these radionuclides were relatively low in the middle and eastern areas of the bay and high in the western area, which has several major river mouths, suggesting that the contribution of riverine input affected only the western area. In the middle and eastern areas, the level of137Cs inventory was much lower than that of the soils, and the excess210Pb inventory was at the same level or lower. These results indicate that removal effects are stronger than accumulation effects (riverine input) in these areas. The patterns of radionuclides were consistent with the results, that grain size was relatively large in the middle and eastern areas, implying strong current conditions, and that fine sediment accumulated less in these areas.