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| Titel |
Assessment of shallow subsurface characterisation with non-invasive geophysical methods at the intermediate hill-slope scale |
| VerfasserIn |
S. Popp, D. Altdorff, P. Dietrich |
| 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 ; 17, no. 4 ; Nr. 17, no. 4 (2013-04-02), S.1297-1307 |
| Datensatznummer |
250018839
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| Publikation (Nr.) |
 copernicus.org/hess-17-1297-2013.pdf |
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| Zusammenfassung |
| Hill-slopes of several hectares in size represent a difficult scale for
subsurface characterisation, as these landscape units are well beyond the
scope of traditional point-scale techniques. By means of electromagnetic
induction (EMI) and gamma-ray spectroscopy, spatially distributed soil proxy
data were collected from a heterogeneous hill-slope site. Results of EMI
mapping using the EM38DD showed that soil electrical conductivity (ECa) is
highly variable at both temporal and spatial scales. Calibration of the
integral ECa signal to a specific target like soil moisture is hampered by
the ambiguous response of EMI to the clay-rich hill-slope underground.
Gamma-ray results were obtained during a single survey, along with EMI
measurements and selected soil sampling. In contrast to ECa, a noticeable
correlation between Total Count and K emission data and soil-water content
seemed to be present. Relevant proxy variables from both methods were used
for k means clustering in order to distinguish between hill-slope areas with
different soil conditions. As a result, we obtained a suitable partition of
hill-slope that was comparable with a previously obtained zonation model
based on ecological factors. |
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