Simulation of vertical flow in a sanitary landfill: a case study
DOI:
https://doi.org/10.24849/j.geot.2015.134.01Keywords:
Sanitary landfill, Vertical flow, Computational modellingAbstract
This research aimed to study the flow of water through cover layers of landfills using the HYDRUS-1D computational code (Šimůnek et al., 2013). After a parametric study based on data obtained from field and laboratory tests, the final unsaturated hydraulic parameters were selected for simulating flow through a landfill assuming the particular geometry. Based on the final configuration of the landfill, two scenarios were considered. First assuming flow through individual landfill cells, after which the volumes of fluid produced by each cell were added together. Second considering overlapping cells as in the actual field situation, with the volumes calculated for each profile height added to produce one overall drainage estimate for the entire landfill. Volumes of leachate obtained for both scenarios were compared with field observation drainage rates. The research shows that the selected 1D computer code proved to be an efficient tool for studying flow in municipal solid waste landfills. Results suggest that hydrological processes in a landfill are strongly influenced by rainfall, hydraulic conductivity and the number and thicknesses of intermediate and final cover layers.
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