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| Titel |
Monitoring hillslope moisture dynamics with surface ERT for enhancing spatial significance of hydrometric point measurements |
| VerfasserIn |
R. Hübner, K. Heller, T. Günther, A. Kleber |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 1 ; Nr. 19, no. 1 (2015-01-14), S.225-240 |
| Datensatznummer |
250120590
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| Publikation (Nr.) |
 copernicus.org/hess-19-225-2015.pdf |
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| Zusammenfassung |
| Besides floodplains, hillslopes are basic units that
mainly control water movement and flow pathways within catchments
of subdued mountain ranges. The structure of their
shallow subsurface affects water balance, e.g. infiltration,
retention, and runoff. Nevertheless, there is still a gap in the
knowledge of the hydrological dynamics on hillslopes, notably due to
the lack of generalization and transferability.
This study presents a robust multi-method framework of electrical resistivity
tomography (ERT) in addition to hydrometric point measurements, transferring
hydrometric data into higher spatial scales to obtain additional patterns of
distribution and dynamics of soil moisture on a hillslope. A geoelectrical
monitoring in a small catchment in the eastern Ore Mountains was carried out at
weekly intervals from May to December 2008 to image seasonal moisture dynamics on the
hillslope scale. To link water content and electrical resistivity, the
parameters of Archie's law were determined using different core
samples. To optimize inversion parameters and methods, the derived
spatial and temporal water content distribution was compared to
tensiometer data. The results from ERT measurements show a strong correlation with the
hydrometric data. The response is congruent to the soil tension data. Water content
calculated from the ERT profile shows similar variations as that of water content from soil
moisture sensors. Consequently, soil moisture dynamics on the hillslope scale may be
determined not only by expensive invasive punctual hydrometric measurements, but also
by minimally invasive time-lapse ERT, provided that pedo-/petrophysical relationships are
known. Since ERT integrates larger spatial scales, a combination with hydrometric point
measurements improves the understanding of the ongoing hydrological processes and better suits
identification of heterogeneities. |
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