Spatiotemporal analysis of radioactive contamination in Tokyo Bay due to the Fukushima accident and evaluation of the process of environmental pollution using its radioactive cesium as a tracer

2016 Fiscal Year Final Research Report

• Project/Area Number: 24310014
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Environmental dynamic analysis
• Research Institution: Kindai University
• Principal Investigator: YAMAZAKI Hideo 近畿大学, 理工学部, 教授 (30140312)
• Co-Investigator(Kenkyū-buntansha): 香村 一夫 早稲田大学, 理工学術院, 教授 (10434383) ; 森脇 洋 信州大学, 繊維学部, 教授 (30321938) ; 加田平 賢史 大阪市立環境科学研究所, その他部局等, 研究員 (50342986) ; 廣瀬 孝太郎 神戸大学, 学内共同利用施設等, 助教 (60596427) ; 井上 淳 大阪市立大学, 理学(系)研究科(研究院), 准教授 (90514456)
• Project Period (FY): 2012-04-01 – 2017-03-31
• Keywords: 福島第一原発事故 / 放射能汚染 / 東京湾 / 堆積物 / 物質循環 / 放射性セシウム

Outline of Final Research Achievements

Radiocesium discharged by the Fukushima Daiichi Nuclear Power Plant accident was also deposited in the Tokyo metropolitan region, but finally flowed into and accumulated in Tokyo Bay. The distribution and fluctuation of radiocesium in Tokyo Bay sediment was analyzed in this study to clarify the movement of radiocesium in the Tokyo metropolitan region. A monitoring survey was conducted from August 2011 to July 2016 of the spatiotemporal distribution of radiocesium concentration in sediments and water in Tokyo Bay and in rivers flowing into it. Most of the radiocesium that flowed into Tokyo Bay originated in a high-concentration contamination zone in the north eastern part of the Tokyo region, then flowed into and was deposited in the estuary of the old Edogawa River. At present, almost no radiocesium has spread into the canter of Tokyo Bay. Contrarily, the inventory of radiocesium in the old Edogawa estuary of the deep Tokyo Bay has increased.

Free Research Field

環境動態解析