Abstract
A semianalytic (finite layer) technique that will readily allow modelling of the interaction between different landfill cells is presented. The cells may be either adjacent or separated and may have different dimensions (length, thickness) and different source leachate characteristics. The technique also allows modelling of the finite service life of engineered components of the barrier system such as the service life of the primary leachate collection system and, if present, geomembrane liner. The application of the technique is illustrated by first considering the longitudinal expansion along the alignment of leachate migration of a landfill and examining the interaction between the original and subsequent landfill in terms of impact on the underlying aquifer. Consideration is then given to the vertical expansion of existing landfills and finally to the modelling of the finite service life of a primary leachate collection system and geomembrane liner. It is demonstrated that a vertical expansion has considerable potential for increasing long-term impact and that the impact is also controlled by the service life of the engineered system.Key words: landfill, expansion, analysis, service life.
Published Version
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