Abstract
Large-scale experiment by using lysimeter was conducted to clarify the infiltration of soil water through three-layered formation structure, composed of top loam, fly ash and bottom loam, the calcium leaching from the fly ash, and the leached calcium migration through the bottom loam layer. The results showed that the infiltration through each layer was expressed in van-Genuchten's models, and that the permeability of fly ash was sensitively dependent on water content. Henry type model was applicable to the calcium leaching. The calcium migration through bottom loam layer was described by the combined model which consisted of a reversible Henry model and an irreversible first-order reaction model.
