Abstract
Experimental results presented in previous report was almost reproduced by numerical model, which is employing film flow expression for water movement in gravel layer. The result of real scale numerical experiments carried out by the model showed leachate can be drained completely by capillary barrier if the intensity of leachate reached at the bottom of landfill was below 0.4mm/h. Several effective parameters were altered for examining the drainage capacity. As results, 1) the effectiveness of downdip structure dragging down upper layer can not improve after it exceeds certain depth. 2) more uniform sand can increase drainage capacity. 3) barrier can drain leachate completely as far as infiltrated water is small enough against the amount of water which can decrease potential of upper layer to boundary potential.
