The radioactive substance, such as 134Cs and 137Cs from the Fukushima Dai-ichi Nuclear Power Plant (FDNPP), were transported with finer soil particles. In order to simulate the radiocesium transport, it is necessary to understand well the behavior of soil particle in hydrological systems. In this paper, we conducted the soil erosion experiment by using rainfall simulator and applied the existing erosion model to experimental results. Then we focused on the soil erosion phenomenon of each soil particle size. According to the experimental result, erosion rate reduces with time and flow rate become constant. The particle size distribution of eroded sediment and original soil surface are similar results. The existing erosion model reasonably reproduced different characteristic of each soil type and each particle size.
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