Abstract
The objective of this study is to investigate the effect of soil structural changes on raindrop erosion processes. Disturbed and undisturbed soils are sampled in embanked slope of Memanbetu, Hokkaido. According to the results of raindrop erosion test, splash ratio decreased after the repetition of freezing-melting process. Soil saturated hydraulic conductivity increased after the repetition. It was concluded that percolation mechanism is important to understand the raindrop erosion processes. Percolation volume was simulated on the bases of rheological properties of percolated suspen-sion and pF-moisture distribution curves. Results of the simulation represented observed changes in permeability due to the repetition of freezing-melting process in this study.
