Fractal analysis on the miniature erosion landform generated by artificial rainfall

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A miniature erosion landform was formed by applying artificial rainfall on a square mound made of a mixture of fine sand and kaolinite, and the surface topography was analyzed to evaluate the meaning of H', which is a parameter expressing a certain complexity of self-affine surfaces, in the landform evolution. Erosion started as rapid valley erosion, and then slow degradation of interfluves and ridges followed. The average height shows a clear exponential decrease. After 192 hours of rainfall, a low and gentle topography appeared. The value of H' decreases rapidly from 1 to 0.7～0.8 in the early stage and then gradually to 0.59 at the end of experiment, with a tendency to decrease towards 0.5 in a longer time period. This implies that the H' value of landform tends to decrease towards 0.5 with a long period of erosion, and that some reiterated uplift would be necessary to keep the larger H'.
東京都立大学の論文