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ERT Monitoring Sheds Light on the Hydrogeological Behavior in a Landfill
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Near Surface Geoscience 2015 - 21st European Meeting of Environmental and Engineering Geophysics, Sep 2015, Volume 2015, p.1 - 5
Abstract
An engineered landfill is a very complex media. The internal structure of the waste mass (resulting from the compaction mode, the landfill growth and the waste complexity itself) is generally poorly documented and very difficult to figure out. Measuring and modifying the water content of the waste mass is a challenge in order to optimize biodegradation of evaluate landfill mining opportunities.
During the ERT monitoring of a recirculation experiment, numerous observations were made regarding the landfill hydrogeological features.
On one hand, time laps ERT during water recirculation is an interesting tool to characterize the heterogeneity of the waste mass. The media appears strongly anisotropic (water flows mainly horizontally). The underground flow pattern is also governed by the existence of preferential flow paths (old wells, drain, roads …).
On the other hand, observation of major rainfall events clearly demonstrates the role of the cover layer morphology and composition and the vegetation density and type on the water balance. Reverse slope in the cover layer induces local high infiltration rate. Electrical geophysical method could be used to control the permeability of the cover layer and estimate the water balance of the site or the efficiency of infiltration pounds.