2. Material and methods2.1. Model description and structureAs previously discussed, the paper presents a 1D model for thesimulation of the vertical leachate fluxes throughout a landfill forMSW and its application to a semi-idealized landfill case study.The model was based on mass balance equations, which allowthe evaluation of the moisture accumulation inside the landfilland the possible formation of perched leachate zones. The formationof perched leachate zones will occur when the saturated moisturecontent is reached at any point of the landfill. Indeed, one ofthe model assumption is that under unsaturated conditions the leachate flux is vertical and the horizontal flux is zero. The liquidinput to the model is the rain that impacts on the surface of thelandfill body, and then infiltrates into the landfill. The liquid movementthrough the landfill strictly depends on the landfill characteristicsin terms of initial moisture content and vertical distributionof the strains. The latter influences both the value of the hydraulicconductivity and the volumetric moisture content.
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