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| Titel |
High resolution observation of soil water dynamics in a complicated architecture with Ground-Penetrating Radar |
| VerfasserIn |
P. Klenk, C. Seegers, A. Dagenbach, S. Jaumann, J. S. Buchner, K. Roth |
| 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 |
250066597
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| Zusammenfassung |
| Over the last decades, surface Ground-Penetrating Radar (GPR) has become a reliable tool
for studying the subsurface at the field scale. However, there still is a need for detailed
studies under well-controlled field conditions. Besides improving the quantitative
GPR analysis, this also furthers the understanding of near-surface hydrological
processes.
In this study, we present the results of high-resolution multichannel GPR observations of
fluctuating water table experiments at the Heidelberg ASSESS-GPR test site. This site
is an artificial sand-bed with a well-defined, known subsurface structure, where
the pertinent boundary conditions are either measured or can be directly adjusted.
During these experiments, a well-defined amount of water has been infiltrated into
the structure from below over the course of several hours and was subsequently
pumped out again. Concurrently, various multichannel surface GPR measurements
at three different frequencies have been carried out at characteristic locations on
the sand-bed. The large number of radargrams, which have been obtained at
a temporal resolution of about one minute throughout the whole experiment
duration, allow for a detailed representation of the spatio-temporal water content
dynamics.
We discuss in particular (i) the conditions under which compacted sand layers act as
reflectors, (ii) the interference of reflections from the moving capillary fringe with those
from the sand layers, and (iii) the information that can be retrieved from observing the
dynamics of the capillary fringe moving through different layers. From these results, we
draw further conclusions for quantitative measurements at previously unknown field
sites. |
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