A Two-Dimensional Model for Estimating Leachate Flow in Landfills

by Shabbir Ahmed, City Univ of New York, United States,
R. M. Khanbilvardi, City Univ of New York, United States,
John Fillos, City Univ of New York, United States,
Philip Gleason, City Univ of New York, United States,

Document Type: Proceeding Paper

Part of: Optimizing the Resources for Water Management


A numerical model has been developed to compute the leachate flow from solid waste landfills in an unsteady state condition. The two-dimensional moisture flow equation along with the boundary conditions has been solved by using an implicit finite-difference scheme in a vertical plane. The boundary conditions include computation for evapotranspiration, runoff from landfill surface, and infiltration from precipitation into the solid waste inside the landfill. The leachate accretion rate is obtained from the time-history of moisture content. Solution of the saturated leachate flow equation at the bottom of the landfill gives lateral flow towards the perimeter or the collection system in the landfill. The model was applied to a sample section of a landfill to demonstrate the prediction of runoff, evapotranspiration, net infiltration, and leachate flow components in a landfill.

Subject Headings: Two-dimensional models | Landfills | Leachates | Two-dimensional flow | Computer models | Numerical models | Boundary conditions | Finite difference method

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