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| Titel |
Exchanging knowledge and working together in COST Action TU1208: Short-Term Scientific Missions on Ground Penetrating Radar |
| VerfasserIn |
Sonia Santos Assuncao, Philippe De Smedt, Iraklis Giannakis, Loredana Matera, Nicolas Pinel, Klisthenis Dimitriadis, Antonios Giannopoulos, Jacopo Sala, Sébastien Lambot, Immo Trinks, Marian Marciniak, Lara Pajewski |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250114954
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| Publikation (Nr.) |
 EGU/EGU2015-15792.pdf |
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| Zusammenfassung |
| This work aims at presenting the scientific results stemming from six Short-Term Scientific
Missions (STSMs) funded by the COST (European COoperation in Science and Technology)
Action TU1208 “Civil Engineering Applications of Ground Penetrating Radar” (Action
Chair: Lara Pajewski, STSM Manager: Marian Marciniak). STSMs are important means to
develop linkages and scientific collaborations between participating institutions involved in a
COST Action. Scientists have the possibility to go to an institution abroad, in order to
undertake joint research and share techniques/equipment/infrastructures that may not be
available in their own institution. STSMs are particularly intended for Early Stage
Researchers (ESRs), i.e., young scientists who obtained their PhD since no more than 8 years
when they started to be involved in the Action. Duration of a standard STSM can be from 5 to
90 days and the research activities carried out during this short stay shall specifically
contribute to the achievement of the scientific objectives of the supporting COST
Action.
The first STSM was carried out by Lara Pajewski, visiting Antonis Giannopoulos at The
University of Edinburgh (United Kingdom). The research activities focused on
the electromagnetic modelling of Ground Penetrating Radar (GPR) responses to
complex targets. A set of test scenarios was defined, to be used by research groups
participating to Working Group 3 of COST Action TU1208, to test and compare different
electromagnetic forward- and inverse-scattering methods; these scenarios were modelled
by using the well-known finite-difference time-domain simulator GprMax. New
Matlab procedures for the processing and visualization of GprMax output data were
developed.
During the second STSM, Iraklis Giannakis visited Lara Pajewski at Roma Tre University
(Italy). The study was concerned with the numerical modelling of horn antennas
for GPR. An air-coupled horn antenna was implemented in GprMax and tested
in a realistically modelled pavement scenario; moreover, the horn was compared
with a previously-implemented ground-coupled bowtie antenna. The numerical
results indicate that air-coupled antennas receive clear reflections from distinct layers
within the pavement but they are incapable in the considered setting to detect cracks
filled with air. On the other hand, by using ground-coupled antennas it is easier to
interpret hyperbolic responses from the buried cracks. The developed modelling
framework is a powerful tool in evaluating the performance of high-frequency GPR
transducers in realistic situations and this approach can lead to better design of GPR
antennas.
The third STSM was carried out by Sonia Santos Assunçao visiting Klisthenis Dimitriadis at
Geoservice (Greece). They worked at the non-destructive inspection of the Tholos Tomb of
Acharnon. The unknown thickness of the Tomb walls was determined by using a GPR. Data
were plotted in impressive circular radargrams. Discontinuities in the measured data were
identified and associated to fissures or voids, indicating internal and superficial damages of
the Tomb. A combination of GPR with electrical resistivity tomography allowed a
more accurate data interpretation. Vibrations in the Tomb were quantified by using
seismic measurements and endoscopy was used to confirm the thickness of the
walls.
During the fourth STSM, Philippe De Smedt visited Immo Trinks at the Ludwig Boltzmann
Institute for Archaeological Prospection and Virtual Archaeology. The research activities
regarded the reconstruction of prehistoric environments at Stonehenge, by means of multiple
electromagnetic survey methods. Different datasets were processed, analysed and
compared: data from a multi-receiver electromagnetic induction survey (collected by
the ORBit research group from Ghent University, Belgium), and data from a 3D
GPR survey (collected by the Ludwig Boltzmann Institute for Virtual Archaeology
and Archaeological Prospection, Austria). The aim was that of creating a robust
methodological foundation for the combined analysis of electromagnetic-induction and GPR
data.
The fifth STSM was carried out by Loredana Matera, who visited Jacopo Sala at 3d-radar
(Norway). They tested an innovative reconfigurable stepped-frequency GPR, designed and
realised in Italy. The prototype was compared with commercial equipment produced in
Norway. Through laboratory experiments as well as outdoor campaigns in urban scenarios
with archaeological remarks, a deeper knowledge of the Italian prototype was achieved and
plans were made to improve it.
Finally, Nicolas Pinel visited Sébastien Lambot at the Université catholique de Louvain
(UCL); the last STSM presented in this abstract, was devoted to investigating how to model
the effect of soil roughness in the inversion of ultra wide-band off-ground monostatic GPR
signals. The aim of this research is the noninvasive quantification of soil properties through
the use of GPR. The work focused on incorporating the improved asymptotic forward
electromagnetic model developed by Pinel et al. in the multilayer Green function code
developed at UCL.
Acknowledgement
The Authors thank COST, for funding the Action TU1208 “Civil Engineering Applications of
Ground Penetrating Radar,” supporting these STSMs. |
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