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| Titel |
Deriving Macropore and Preferential Flow Parameters from Tracer and Time-lapse 3D GPR Experiments at the Plot-Scale |
| VerfasserIn |
Conrad Jackisch, Niklas Allroggen, Jens Tronicke, Erwin Zehe |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250096833
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| Publikation (Nr.) |
 EGU/EGU2014-12357.pdf |
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| Zusammenfassung |
| "Hydrology - a science in which all processes are preferential" (Uhlenbrook, 2006) - as such
preferential flow is known and discussed in hydrology since almost three decades. At the
same time, preferential flow remains problematic as explicit descriptions are hard to
define and upscale and implicit descriptions remain rather case sensitive. Moreover,
our techniques to monitor preferential flow and especially flow structures are very
limited.
We conducted three multi-tracer plot-scale (1m x 1m) sprinkler experiments at a forested
hillslope in the Attert Basin in Luxembourg with prevailing geogenic and biogenic
preferential flow structures. It was accompanied by a 3D time-lapse GPR (Ground
Penetrating Radar) survey covering an area of 3m x 3m.
We present the results with special emphasis on the derivation of macropore parameters
for further modelling. To do so, we developed an automated analysis of images from
excavated Brilliant Blue stained profiles. Additionally, we analyse our time-lapse GPR data
with respect to temporal changes and derive 3D strutural information of the preferential flow
patterns. Superior to tracers, this high resolution subsurface imaging technique is
non-invasive, repeatable and therefore helps to disentangle the dye stained patterns towards
process observation.
The results of the image analyses and the GPR surveys are compared and referenced to
soil moisture monitoring, sampled Bromide profiles and stable isotope signatures. We further
discuss implications for joint development of model concepts and observation methods. |
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