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Cs concentrations in coastal sediments off FukushimaSuzuki, Shotaro*; Amano, Yosuke*; Enomoto, Masahiro*; Matsumoto, Akira*; Morioka, Yoshiaki*; Sakuma, Kazuyuki; Tsuruta, Tadahiko; Kaeriyama, Hideki*; Miura, Hikaru*; Tsumune, Daisuke*; et al.
Science of the Total Environment, 831, p.154670_1 - 154670_15, 2022/07
Times Cited Count：2 Percentile：29.93(Environmental Sciences)Nagao, Seiya*; Otosaka, Shigeyoshi; Kaeriyama, Hideki*
Journal of Oceanography, 73(5), P. 527, 2017/10
Times Cited Count：1 Percentile：46.07(Oceanography)More than five years have passed since the accident at the Fukushima Daiichi Nuclear Power Plant, and many investigations have been carried out in the marine environment. Regarding the radiocesium concentration in seabed sediment, from May 2011, monitoring survey is continuing mainly in the coastal areas of Miyagi, Fukushima, Ibaraki and Chiba prefectures. However, due to its heterogeneity, the difficulty of observation, etc., the assessment of the influence of the accident-derived radionuclides on seabed sediments and the benthic ecosystem is delayed compared to other environmental investigations. As the Guest Editors, the authors set up a special section in "Journal of Oceanography", including four papers arguing about factors affecting the temporal change of the radiocesium concentrations in estuarine, coastal and offshore sediments. This preface shows the planning intention of the special issue, and also outlines the contents.
Kaeriyama, Hideki*; Furuichi, Naoki*; Sugimatsu, Koichi*; Otosaka, Shigeyoshi
no journal, ,
In order to overview the distribution of suspended particles near the coastal seafloor, an in-situ analyzer of particle size distribution was deployed in the coastal area (100 
200 m depth) of Miyagi, Fukushima and Ibaraki Prefectures in September 2017 and June-July 2018. In the observation in September 2017, as a whole, maxima of suspended particle concentration were observed in the subsurface layer (around 40 m in depth) and above the seabed. In the subsurface layer, relatively coarse particles with a particle size of 74 - 330 
m was predominant. This layer corresponded with the peak depth of the chlorophyll fluorescence intensity, and it was inferred that the coarse particles were derived from phytoplankton. Seawater near the seafloor contained fine particles with a grain size of 3.78 - 63 m was dominant while coarser particles as observed in the subsurface layer were also observed near the seabed in some shelf-edge stations. It was suggested that particles carried from the surface layer tend to retain in the bottom water of the shelf margin.
