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－　　－16Tomoaki NAKAMURA Assistant Professor, Department of Civil Engineering Tomoaki Nakamura is an Assistant Professor at the Department of Civil Engineering, College of Industrial Technology of Nihon University. Dr. Nakamura received his B. L. A. in Civil Engineering from Nihon University in 2006 and his Ph. D. from Advanced Research Institute Science and Technology, Nihon University in 2011. Dr. Nakamura worked for Tokyo Electric Power Environment Engineering Corporation from 2011 to 2014, where he was simultaneously engaged in environmental assessments that affect power plants and harbor facilities. Dr. Nakamura’s work has included predicting distribution of radioactively contaminated water released by Fukushima Daiichi Nuclear Power Plant by means of a three-dimensional flow model linked with a diffusion model, and monitoring to grasp thermal discharge spread influence. He is a member of JSCE, JSMST, and JSIA. Research Achievements1) IMPROVEMENT OF CECIUM DIFFUSION ANALYSIS IN TOKYO BAY, Journal of Ocean Engineering (JSCE), Vol.74, No.2, p.Ⅰ_1000-Ⅰ_1005, 2018.2) CONSTRUCTING A NUMERICAL MODEL OF CESIUM CONCENTRATION ANARYSIS SEDI-MENT CONSIDER MASS TRANSPORT IN THE TOKYO BAY, Journal of Ocean Engineering (JSCE), Vol.73, No.2, p.Ⅰ_911-Ⅰ_916, 2017.3) ANALYSIS OF 137Cs CONCENTRARITONS FROM THE RIVERS AT FUKUSHIMA, Journal of Ocean Engineering (JSCE), Vol.72, No.2, p.Ⅰ_694-Ⅰ_699, 2016.4) CONCENTRATION ANALISIS OF RADIOACTIVE CONTAMINATION WATER IN THE PACIFIC IN FRONT OF FUKUSHIMA, Journal of Hydraulic Engineering (JSCE), Vol.71, No.4, pp.I_691-I_696, 2015.5) ANALYSIS OF THE CHEMICAL (DIOXIN) CONCENTRATION IN TOKYO BAY, Journal of Global Environment (JSCE), Vol.70, No.5, pp.I_277-I_283, 2014.:20cm/s 隅田川、荒川、江戸川鶴見川多摩川Concentration : Bq/L0.008 0.008 0.007 0.010 0.010 0.009 0.008 0.008 0.007 0.010 0.010 0.010 0.009 0.009 0.008 0.008 0.010 0.010 0.010 0.009 0.009 0.008 0.008 0.009 0.009 0.009 0.009 0.009 0.006 0.007 0.008 0.009 0.008 0.004 0.004 0.005 0.006 0.007 0.007 0.007 0.004 0.004 0.005 0.006 0.003 0.003 0.003 0.002 0.002 0.002 0.001 0.001 0.001 0.001 0.000 0.001 0.001 0.001 Fig. 1 Flow of Fukushima (Pacific Ocean model)Fig. 2 Model conceptFig. 3 Distribution of cesium in Tokyo baySmall particulateCsLarge particulateClDissolvedCdDisaggregationAggregationDesorptionAdsorptionRemineralization (decomposition, dissolution) of particleRK2(Desorption)BioturbatedlayerCbDiffusive layerCDInterfaceparticle layerCpK1(Adsorption)λd1,3λd3,1Interface seawater layerDiffusion λd3,4λd4,3Transfer by diffusionDiffusionBurial λs3,4Burialλs2,3λb3,2Transfer by bioturbation λb2,3Burialλs,4Settling10-1 m1.9m10-3 mRcdRcｓInputfromRiver