Fig.1　Time dependence of radioactive cesium concentrations upstream of the Ogaki dam and input data for the simulation

Fig.2　Comparison between the time dependence of radioactive cesium concentrations at the outflow of the Ogaki dam and numerical curve obtained by simulation

Fig.3　Relationships among rain fall (flow rate), duration and ¹³⁷Cs outflow rate（example of the dam lake with volume of 10⁷m³）

• Dynamics of radioactive cesium in the dam lake was simulated.The simulation curve well represents the measurement data for radioactive cesium concentrations.
• Outflow rate increases with rain fall and its duration increasing and depends on particle size distribution of floating soils.

Reference：Kurikami et al., 2016, Journal of Environmental Radioactivity, vol.164, 73-83.

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Reference

1. Kurikami, H. et al, Numerical study of sediment and 137Cs discharge out of reservoirs during various scale rainfall events, Journal of Environmental Radioactivity, vol.164, 2016, p.73-83.