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| Titel |
Realtime infiltration process monitoring in macroporous soil – a plot-scale experiment accompanied by high-resolution time-lapse 3D GPR |
| VerfasserIn |
Conrad Jackisch, Niklas Allroggen |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250132517
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| Publikation (Nr.) |
 EGU/EGU2016-13033.pdf |
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| Zusammenfassung |
| Infiltration and quick vertical redistribution of event water through rapid subsurface flow in
soil structures is one of the key issues in hydrology. Although the importance of
preferential flow is broadly recognised, our theories, observation techniques and
modelling approaches lose grounds when the assumption of well-mixed states in REVs
collapses. To characterise the combination of advective and diffusive flow is especially
challenging.
We have shown in earlier studies that a combination of TDR monitoring, dye- and
salt-tracer recovery and time-lapse 3D GPR in irrigation experiments provides means to
characterise infiltration dynamics at the plot- and hillslope-scale also in highly
structured soils. We pinpointed that the spatial and temporal resolution requires
special attention and improvement - particularly owing to the facts of high velocity
(10−3 ms−1) of advective flow and small scale (10−2 m) of the respective flow
structures.
We present insights from a novel technique of continuous high-resolution time-lapse 3D
GPR measurements during and after a plot-scale (1 m x 1 m) irrigation experiment.
Continuous TDR soil moisture measurements, dye tracer excavation and salt-tracer samples
are used as qualitative and quantitative references. While classical infiltration experiments
either look at spatial patterns or temporal dynamics at singular gauges, we highlight the
advantage of combining both to achieve a more complete image of the infiltration process.
Although operating at the limits of the techniques this setup enables non-invasive observation
of preferential flow processes in the field and allows to explore and characterise macropore
matrix exchange. |
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