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| Titel |
A new combined wavelet methodology applied to GPR and ERT data in the Montagnole experiment (French Alps) |
| VerfasserIn |
L. Alperovich, L. Eppelbaum, V. Zheludev, J. Dumoulin, F. Soldovieri, M. Proto, M. Bavusi, A. Loperte |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250064222
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| Zusammenfassung |
| Ground Penetrating Radar (GPR) and Electric Resistivity Tomography (ERT) methods are
well assessed and accurate geophysical methods for studying subsurface geological sections.
These methods were jointly applied at the Montagnole (French Alps) experimental site with
the aim to study effects of possible catastrophic rockslides in transport infrastructures. The
main goal of the experiment was a careful geophysical imaging of subsurface structure
before and after of iron ball on the ground impact series. It is known that factors
as ambiguity of geophysical field examination, complex geological media, and
unfavourable “useful signal”–to–noise ratio in some situations do not permit to construct
reliable physical-geological models of the studied subsurface structure. Here, we
applied for the GPR and ERT methods at the Montagnole site, the recent advances in
the wavelet theory and data mining. Wavelet approach was specifically applied to
achieve enhanced (e.g., coherence portraits) images due to the integration of different
geophysical fields; in fact, the methodology based on the matching pursuit with wavelet
packet dictionaries enabled us to extract desired signals even from strongly noised
data. Such tools as complex wavelets were employed to the coherence portraits,
combined GPR–ERT coherency orientation angle, to name a few, enable performing
non-conventional operations of integration and correlation in subsurface geophysics.
These parameters can be used not only for location of buried inhomogeneties, but
also for a rough estimation of their electromagnetic and related properties. The
combination of the above approaches has allowed to set-up a novel methodology, which
enhances reliability and confidence of each individually geophysical method and their
integration.
Acknowledgement
This investigation is funding from the European Community’s FP7 Program under grant
agreement No. 225663, Joint Call FP7-ICT-SEC-2007-1 |
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