Abstract
Particle breakage and effect on erodibility associated with compaction, were investigated. Erodibility of compacted mixed soil changed markedly along with the changes of permeability. The splash ratio (the volume of soil which splashed per unit volume of rainfall)and the amount of soil loss increased with the decrease of permeability. A peak was observed when the hydraulic conductivity was about 10-6cm s, followed by a rapid decrease. Erodibility characteristics of specific soils were as follows: there was a remarkable decrease of the splashing ratio in clayey soils, and an increase in sandy soils. Effect of compaction on the amount of soil loss was observed only in kaoline. Changes in the amount of soil loss in the Masa soil were not appreciable while in samples of other soils, soil loss increased by compaction. Compaction affected splash erosion in the case of clayey soils unlike in sandy soils. Permeability was related to erosion associated with rainfall and runoff. The effect of compaction was not significant in soils except for Kaolin, and, in perticular no effect was observed in volcanic ash soils.
