Effect of surface soil compactness on soil erosion: Indoor erosion experiment in changing the dry density of cohesive soil
2001
Fukada, M. (Yamaguchi Univ. (Japan). Faculty of Agriculture) | Kusaka, T. | Nishiyama, S. | Ohno, T.
This study aims at investigating the effect of surface soil compactness on erosion in laboratory experiments. Under the fixed condition of experimental soil with 14% water content and 10deg slope-gradient in an erosion box (50cm supL *10cm supW *5cm supD) , 4typesofwaterflow (0.3, 0.5, 1.0, 2.0 cube cm/(s*cm) ) were appliedover the surface of the soil with a dry density of 1.2, 1.4 and 1.6 g/cube cm respectively. The surface flow volume, the outflow soil volume and its particle size distribution were measured at 2 minutes interval. From the experiments, the following results were obtained: 1) Under the same surface flow volume, the surface soil loss, or erosion was highest on the soil with low dry density. 2) The soil water content after surface flow increased high as dry density decreased. This could have been due to the loosening of the pore-space among soil particles and an increase in infiltration caused by a large amount of soil loss. 3) For sheet erosion, soil loss decreased with time irrespective of the dry density and surface flow volume. However, for rill erosion, the soil outflow rate reaches the peak in a time-interval. This peak became higher as the dry density decreased. 4) Clay and fine sand particles could be heavily eroded by surface flow. This tendency was noticeable just after the start of surface flow and on the soil with a high dry density.
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