Study on Moisture Movement in Solid Waste Landfill with Cover Soil Layers

Abstract

In order to clarify the effect of daily cover soil on moisture movement in a solid waste landfill, water permeation experiments were carried out using large two-dimensional lysimeters in which inclined cover soil layers were constructed, and the effects were examined by unsaturated water flow analysis.
It was proven that the moisture movement was uneven horizontally because of the existence of inclined cover soil layers, and rainwater permeation through these layers to the landfill waste was impeded. It was demonstrated that the unevenness of horizontal permeation decreased as the slope of a cover soil layer became gentler. This suggests that uneven permeation could be mitigated by the proper positioning of inclined soil layers in the landfill waste layers.