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Geophysical surveys for unlocking landfill resources: from past applications to future developments
Van de Vijver, Ellen; Caterina, David; Isunza Manrique, Itzel et al.
2020AGU fall meeting
 

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Keywords :
geophysics; landfill
Abstract :
[en] The earliest recognition of the potential of geophysical methods for characterizing landfill sites dates from over half a century ago and since then numerous case studies have been presented. In the vast majority of studies in the literature, the interest in landfill investigation relates to the assessment of associated environmental pollution problems, primarily the contamination of groundwater by landfill leachate. The landfill geometry and internal structure are recurrent targets in geophysical surveys performed in direct support of planning site remediation projects. While remediation usually involves the excavation of the disposed wastes, in which part of the excavated materials can be recycled, only a few studies have made an explicit link to landfill mining. The recent introduction of the concept of dynamic landfill management – aiming to provide an integrated framework for landfill pollution prevention, and land remediation and reclamation, including enhanced landfill mining focusing on the recovery of resources in terms of materials and/or energy – provided a new incentive to advance the use of geophysical methods as economic tools for landfill characterization. Yet, setting the waste composition and the quality of waste materials for recovery as main targets adds some new challenges to the more conventional survey practice tailored to environmental risk assessment. The extreme complexity, variability and heterogeneity that waste deposits can show, raise the ambiguity of possible interpretations of geophysical data to the next level and, hence, careful preparation is required for any investments made in geophysical investigations not to go to waste. In this contribution, we present an overview of recent applications of geophysical methods to the study of landfills of different types of waste, ages, and construction settings. We identify critical factors to successful site exploration to support landfill “mining” and formulate recommendations for the improvement of geophysical survey design and accompanying calibration and/or validation sampling in order to achieve maximal information retrieval and allow for uncertainty assessment of the obtained results. The instructions given are illustrated by examples of case studies conducted within the EU projects RAWFILL and NEW-MINE.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Van de Vijver, Ellen;  Universiteit Gent - UGent > Department of Environment
Caterina, David  ;  Université de Liège - ULiège > Département ArGEnCo > Géophysique appliquée
Isunza Manrique, Itzel ;  Université de Liège - ULiège > Département ArGEnCo > Géophysique appliquée
Bobe, Christin;  Universiteit Gent - UGent > Department of environment
Nguyen, Frédéric ;  Université de Liège - ULiège > Département ArGEnCo > Géophysique appliquée
Language :
English
Title :
Geophysical surveys for unlocking landfill resources: from past applications to future developments
Publication date :
16 December 2020
Event name :
AGU fall meeting
Event date :
du 13 décembre au 17 décembre 2020
Audience :
International
Name of the research project :
RAWFILL
Funders :
Interreg North-West Europe [FR]
Available on ORBi :
since 18 April 2021

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