we make the landfill transparentmalagageophysics.com/onewebmedia/rosqvist_workshop malm... · 2012....
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WE MAKE THE LANDFILL TRANSPARENT
Development of a step by step geo-electrical methodology for landfill investigation
Håkan Rosqvist, Rosqvist Resurs
Torleif Dahlin and Virginie Leroux, Lund University,Mats Svensson, Sara Johansson, Carl-Henrik Månsson Magnus Lindsjö, Tyréns, Sweden
Workshop Malmö 16–17 February 2012
MaLaGa
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Objective
To summarize the outcome of several years of research and development in geo-electrical measurements, and to develop a methodology for landfill investigations.
Time and cost effective methodology
MaLaGa
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The step by step methodology is based on
1. Electromagnetic conductivity meter – CMD (Stångslingram)
2. Resistivity – Large scale 3. Resistivity – small scale
Measurements in 2010 and 2011 at Filborna landfill site, Helsingborg, Sweden.
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Background map – Filborna landfill
A - Final soil cover
B – Old road partly filled with inert waste
C – Intermediate soil cover
• 1950 – 2008• Depth – 40-45 m• Area – 35 Ha• 11 Mton of waste
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Electromagnetic conductivity meter - CMD 4/6
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CMD 4
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CMD 6
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Large scale resistivity
2D set-up for measurements in 11 lines
The ABEM Lund Imaging System (Dahlin, 1996)
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Large scale measurements - Large scale features
Bedrock
Erosion valley (old river)
High resistivity near surface
Parts with low resistivity in the landfill at depths
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Fence diagram
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3D Resistivity Mapping
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3D Resistivity Mapping
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3D IP Mapping
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• ABEM Terrameter LS• 3 x ABEM Electrode Selector
ES10-64C• Lightning protection• Mobile internet modem / router• PC for fast data transfer / back-up • Mains power supply
• Stainless steel rod or plate electrodes
• Electrode cables w. pig-tail take-outs
• Water-protected connections
Small scale data acquisition system – 3D
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Monitoring Layout Filborna 2011
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Small scale
Area for measurements – 22 by 40 meter
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Homogeneous resistivity distribution
Small variations over time
Resistivity distribution
Small scale – 3D
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Background information
Various historical geo-information
Old photos
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Organic waste
Wall – waste/clay
Soil cover
Saturated
Unsaturated
Area with old ”biocells” – some features
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Aftonbladet 3 juli 2011
Köpenhamn lamslogs av åskovädret
Jättehagel, kaskadregn och tusentals blixtnedslag. Köpenhamn lamslogs när vädrets makter tog över staden.
Sent i natt hade DMI räknat till 5 309 blixtnedslag och 150 millimeter regn i Köpenhamn med omnejd, enligt danska tidningar.
BILDEXTRA Kaos efter åskoväder Strömavbrott och översvämningar
July 2 - Thunderstorm
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Water infiltration after heavy rainfall
Decrease in resistivityIsosurface showing a -6% change
6 hours between measurements
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Zone with water infiltration correlated to the wall?
Water infiltration after heavy rainfall
Zone with variability in resistivity
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Next step
Validation of the results from the geo-electrical measurements by field sampling and other physical investigations.