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| Titel |
Application of time domain induced polarization to the mapping of lithotypes in a landfill site |
| VerfasserIn |
A. Gazoty, G. Fiandaca, J. Pedersen, E. Auken, A. V. Christiansen, J. K. Pedersen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 6 ; Nr. 16, no. 6 (2012-06-29), S.1793-1804 |
| Datensatznummer |
250013334
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| Publikation (Nr.) |
 copernicus.org/hess-16-1793-2012.pdf |
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| Zusammenfassung |
A direct current (DC) resistivity and time domain induced polarization
(TDIP) survey was undertaken at a decommissioned landfill site situated in
Hørløkke, Denmark, for the purpose of mapping the waste deposits and
to discriminate important geological units that control the hydrology of the
surrounding area. It is known that both waste deposits and clay have clear
signatures in TDIP data, making it possible to enhance the resolution of
geological structures compared to DC surveys alone.
Four DC/TDIP profiles were carried out crossing the landfill, and another
seven profiles in the surroundings provide a sufficiently dense coverage of
the entire area. The whole dataset was inverted using a 1-D laterally
constrained inversion scheme, recently implemented for TDIP data, in order
to use the entire decay curves for reconstructing the electrical parameters
of the soil in terms of the Cole-Cole polarization model.
Results show that it is possible to resolve both the geometry of the buried
waste body and key geological structures. In particular, it was possible to
find a silt/clay lens at depth that correlates with the flow direction of
the pollution plume spreading out from the landfill and to map a shallow
sandy layer rich in clay that likely has a strong influence on the hydrology
of the site. This interpretation of the geophysical findings was constrained
by borehole data, in terms of geology and gamma ray logging. The results of
this study are important for the impact of the resolved geological units on
the hydrology of the area, making it possible to construct more realistic
scenarios of the variation of the pollution plume as a function of the
climate change. |
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