IMPACT OF THREE DIFFERENT HYDRAULIC CONDUCTIVITY EXPRESSIONS ON MODELING LEACHATE PRODUCTION IN LANDFILLS
H. R. BAHERI
AbstractUnsaturated flow in porous media, modeled by Richard's Equation, requires the identification of the moisture advective velocity in terms of hydraulic conductivities. In this study, the impacts of three hydraulic conductivity expressions on the ability of the unsaturated flow model to predict leachate production in landfills were investigated. The two power expressions (Power I and II) and PITTLEACH-2 hydraulic conductivity expression were used along with the Richard's Equation to estimate the leachate flow in solid wastes. Experimental data on leachate generation from eight laboratory scale cells were also used to assess the impact of different expressions on prediction of leachate flow. It was found that using PITTLEACH-2 hydraulic conductivity expression resulted in much better predictions of the leachate generation in all the eight cases studied here.
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