Simulation of Collecting Pipe and Its Drainage Rate at A. Landfill, Japan

摘要

Simulation of collecting pipe system at landfill site is the most difficulty for assigning boundary condition in 2D horizontal groundwater flow model. This paper paid attention to examine the validation of the assignment of the collecting pipe boundary by applying the results of 2D vertical model. As such an example, A. Landfill in Japan was selected as the case study. In the landfill site, 2D vertical model of a cross section simulated the rise of groundwater table above the collecting pipe and calculated its drainage rate. 2D horizontal model was coupled with the recharge model to solve the partial differential equation of groundwater flow. Finite difference method and iterative successive over relaxation were applied. The drainage volume of leachate collection was summed up in the whole landfill site and compared with the average volume of treated waste water. The study demonstrated that the results of 2D vertical model validated and can be applied to 2D horizontal groundwater flow simulation.