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Impacts of Combined Hydrogeological and Chemical Heterogeneities on the Transport of Leachate through Landfill Sites  

Lee, Kun-Sang (Department of Environmental and Energy Systems Engineering, Kyonggi University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.31, no.4, 2009 , pp. 300-307 More about this Journal
Abstract
The transport of landfill leachate in the subsurface formations of unlined landfill sites is considered. The impacts of hydrogeological and chemical heterogeneities on the leachate transport are assessed by examining the results from a series of Monte-Carlo simulations. The landfill system simulated in this study is hypothetically represented with three levels of spatial variability for the hydrogeological and chemical parameter; (1) homogeneous hydraulic conductivity (K) and distribution coefficient ($K_d$), (2) K heterogeneity only, and (3) combined heterogeneities of K and $K_d$. To calculate the transport of leachate through negatively-correlated random hypothetical K-$K_d$ fields generated using geostatistical input parameters, a saturated flow model is linked with a contaminant transport model. Point statistic values such as mean, standard deviation, and coefficient of variation of the concentration were obtained from 100 Monte-Carlo trials. Results of point statistics show that the heterogeneities of K and $K_d$ in the landfill site prove to be an important parameter in controlling leachate concentrations. Consideration of combined K and $K_d$ heterogeneities results in enhancing the variability of contaminant transport. The variability in the leachate concentration for different realizations also increases as the distance between source and monitoring well increase.
Keywords
Landfill; Leachate Transport; Heterogeneity; Monte-Carlo Simulation;
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Times Cited By KSCI : 1  (Citation Analysis)
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