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Faculté des Sciences appliquées
Faculté des Sciences appliquées
MASTER THESIS
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3D geophysical evaluation in the course of the characterization of a municipal waste deposit site

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Debouny, Tom ULiège
Promotor(s) : Nguyen, Frédéric ULiège
Date of defense : 9-Sep-2019/10-Sep-2019 • Permalink : http://hdl.handle.net/2268.2/8320
Details
Title : 3D geophysical evaluation in the course of the characterization of a municipal waste deposit site
Translated title : [fr] Evaluation géophysique 3D dans le cadre d'une caractérisation d'un dépôt de déchets
Author : Debouny, Tom ULiège
Date of defense  : 9-Sep-2019/10-Sep-2019
Advisor(s) : Nguyen, Frédéric ULiège
Committee's member(s) : Caterina, David ULiège
Courard, Luc ULiège
Neculau, Claudia 
Language : English
Number of pages : 128
Keywords : [en] Landfill
[en] Geophysics
[en] Electrical Resistivity Tomography
[en] Induced Polarization
[en] Horizontal to Vertical Noise Spectral Ratio
[en] Forward modelling
Discipline(s) : Engineering, computing & technology > Geological, petroleum & mining engineering
Name of the research project : RAWFILL
Target public : Researchers
Professionals of domain
Student
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en ingénieur civil des mines et géologue, à finalité spécialisée en ressources minérales et recyclage
Faculty: Master thesis of the Faculté des Sciences appliquées

Abstract

[en] Due to the overconsumption and the insufficient waste management in the past, old landfills are today part of the Belgian landscapes. Besides the growing interest in old landfills from an environmental perspective, their exploitation, in terms of material extraction and reuse, perfectly adheres to the growing concept of circular economy and is further supported by the benefits coming from land recovery. The characterization of landfills is consequently becoming an operation key nowadays.

The present master thesis tends to evaluate the pertinence of three different geophysical methods for the characterization of a former landfill located in Onoz. For this purpose, 2D and 3D models of physical properties are computed. The Electrical Resistivity Tomography (ERT) and the Induced Polarization (IP) enables the detection of highly conductive lenses of lime and ashes within a layer of backfill and waste. Moreover, in the northern part of the landfill, the transition between the bedrock and the overlying waste layer is being brought to light. Unfortunately, in the southern part of the landfill, both methods show an overestimation of the highly conductive lime and ashes body, which impacts the detection of the bedrock, in the 3D models as well as in the 2D models. This limitation of the methods was expected thanks to the synthetic model previously computed, avoiding any misinterpretation even in the absence of an adequate model appraisal tool. The Horizontal to Vertical Noise Spectral Ratio (HVNSR) demonstrates different uses in the landfill characterization. Firstly, in the lower part of the site, the HVNSR is used to delineate the different waste zones by simply crossing the information from the H/V graphs obtained with the boreholes. In the upper part of the site, the HVNSR is combined with two available boreholes in order to compute the approximate average shear wave velocity of the lime and ashes. Following some assumptions, it is possible to calculate the thickness of the layers of lime and ashes, allowing the approximation of their total volume in this zone.


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Author

  • Debouny, Tom ULiège Université de Liège > Master ingé. civ. mines & géol., à fin.

Promotor(s)

Committee's member(s)

  • Caterina, David ULiège Université de Liège - ULiège > Département ArGEnCo > Géophysique appliquée
    ORBi View his publications on ORBi
  • Courard, Luc ULiège Université de Liège - ULiège > Département ArGEnCo > Matériaux de construction non métalliques du génie civil
    ORBi View his publications on ORBi
  • Neculau, Claudia
  • Total number of views 12
  • Total number of downloads 30










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