Landfills play a critical role in waste management, but ensuring environmental safety requires monitoring leachate distribution and evaluating the integrity of geomembranes. This report outlines a case study leveraging geophysical methods to assess leachate seepage patterns and detect potential defects in anti-seepage membranes.
Leachate Seepage Detection: Identify the spatial distribution of leachate within the landfill to evaluate its impact on surrounding soil and groundwater.
Liner Integrity Assessment: Detect and locate any damages or defects in the geomembrane to ensure compliance with environmental regulations.
2D Profile Analysis:
ERT2 Survey Line Resistivity Profile
The profile data obtained using specialized landfill devices allowed for the identification of the geomembrane position and the leachate water level. Based on the measurement results, the resistivity distribution beneath the geomembrane is consistent and continuous, indicating good membrane integrity. Therefore, it can be inferred that the geomembrane in this area is intact, with no significant signs of leakage detected.
3D Model Insights:
Three-Dimensional Spatial Visualization of Leachate in the Survey Area
Using the profile data, a three-dimensional model was constructed to analyze the landfill contents, which are typically characterized by low resistivity. Areas with particularly low resistivity can be identified as leachate-rich zones. Based on prior physical property data, a boundary value of 4 Ω·m was used to delineate the leachate distribution. Additionally, the geomembrane interface was determined by referencing the profile morphology.
By analyzing the leachate distribution and porosity, the total volume of leachate at the site was estimated, providing a reliable basis for subsequent leachate extraction and landfill management efforts.
Through this investigation, our company efficiently completed the challenging task of surveying a complex landfill environment, accurately obtaining data on leachate distribution and geomembrane integrity. Leveraging our self-developed high-density resistivity system, renowned for its high precision and strong adaptability, we provided comprehensive support for geomembrane integrity detection and leachate management. Additionally, our work offers valuable scientific and technical insights for future landfill expansion and safe operational planning.
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