To accurately predict the time and place of sediment-related disasters, an urgent ongoing problem is to clarify the behavior of rainfall infiltration in the top 1-2 m thickness of subsurface layers, Normally, rainwater infiltration on hill slopes is determined by unsaturated and saturated numerical analysis using FEM, FDM, or similar methods. But, insufficient verification studies means that it is unclear whether modeled results show good agreement with behaviors on in-situ slopes. Therefore, here is an attempt to elucidate the mechanism of rainfall infiltration by field monitoring.
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