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Vol.1 , No. 3, Publication Date: Aug. 16, 2018, Page: 132-144
| [1] | Shirishkumar Baviskar, Water Resources Department, DHI (India) Water & Environment Pvt Ltd, New Delhi, India. |
| [2] | Timo Heimovaara, Department of Geoscience and Engineering, Delft University of Technology, Delft, Netherlands. |
In this research it is believed that the heterogeneous and unsaturated nature of landfills causes its leachate to flow in preferential pathways. This preferential flow leads to non-equilibrium solute transport at the macro-scopic scale. This research studies the controlling factors responsible for the emergence of non-equilibrium behaviour in a two dimensional unsaturated sand frame. The hypothesis is that material heterogeneity and infiltration patterns and rates affect transport equilibrium. A comparison of flow and transport in a heterogeneous domain with that in a homogeneous domain is done. The results show that more time and water is required to leach out the solute from heterogeneous scenarios compared with the homogeneous case. Two lab scale experiments are simulated using a two dimensional deterministic model. The results observed in the experiments and the numerical solutions gives insight into the non-equilibrium phenomenon occurring in full-scale waste bodies.
Keywords
Unsaturated Heterogeneous Porous Matter, Preferential Flow, Non-Equilibrium in Solute Transport, Landfill Hydrology, Flow and Transport
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