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• W4386834652 endingPage "167083" @default.
• W4386834652 startingPage "167083" @default.
• W4386834652 abstract "The monitoring of existing landfills is a pending environmental issue for the years to come. This monitoring is particularly challenging in the more and more common case of closed landfills, where direct investigation is difficult or impossible, calling for non-invasive methods, which in turn are stretched to maximizing their imaging capabilities in front of difficult logistical constraints, requiring novel and well-conceived scientific approaches. In this study we present a non-invasive approach designed and calibrated to identify the state of the subsoil underlying a closed urban waste landfill. In the presented case, two main questions had to be addressed: (a) whether large karstic cavities are present under the landfill, and (b) if any leachate leakage is present. A 3D Electrical Resistivity Tomography (ERT) configuration was used to solve the problem. The survey design has made use of forward model simulations, in order to verify whether the proposed approach was capable of imaging the possible large karstic cavities. This preliminary study showed the importance of choosing a suitable measurement protocol to recover the true position of the cavities. The analysis of the real field data did not show any anomaly compatible with the presence of large cavities, and thus, in comparison with the previous simulations, led to the conclusion that such cavities are not present. However, the results showed the presence of an electrically conductive anomaly, potentially be linked to leachate release. Direct investigations (drilling and sampling) confirmed the presence of fresh water in a silty sediment environment, both contributing towards the observed larger electrical conductivity, larger than the surrounding drier limestone bedrock. The presented general approach proved to be a valuable, generalizable, tool towards for the characterization and monitoring of closed landfills." @default.
• W4386834652 created "2023-09-19" @default.
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• W4386834652 date "2023-12-01" @default.
• W4386834652 modified "2023-10-18" @default.
• W4386834652 title "Non-invasive investigations of closed landfills: An example in a karstic area" @default.
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• W4386834652 doi "https://doi.org/10.1016/j.scitotenv.2023.167083" @default.
• W4386834652 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37730071" @default.
• W4386834652 hasPublicationYear "2023" @default.
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