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| Titel |
Spectral induced polarization measurements for predicting the hydraulic conductivity in sandy aquifers |
| VerfasserIn |
M. Attwa, T. Günther |
| 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. 10 ; Nr. 17, no. 10 (2013-10-22), S.4079-4094 |
| Datensatznummer |
250085965
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| Publikation (Nr.) |
 copernicus.org/hess-17-4079-2013.pdf |
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| Zusammenfassung |
| Field and laboratory spectral induced polarization (SIP) measurements are
integrated to characterize the hydrogeological conditions at the Schillerslage
test site in Germany. The phase images are capable of monitoring thin peat
layers within the sandy aquifers. However, the field results show limitations
of decreasing resolution with depth. In comparison with the field inversion
results, the SIP laboratory measurements show a certain shift in SIP response
due to different compaction and sorting of the samples. The SIP data are
analyzed to derive an empirical relationship for predicting the hydraulic
conductivity (K). In particular, two significant but weak correlations
between individual real resistivities (ρ') and relaxation times
(τ), based on a Debye decomposition (DD) model, with measured K are
found for the upper groundwater aquifer. The maximum relaxation time
(τmax) and logarithmically weighted average relaxation time
(τlw) show a better relation with K values than the median
value τ50. A combined power law relation between individual ρ'
and τ with K is developed with an expression of A · (ρ')B
· (τlw)C, where A, B and C are determined using a
least-squares fit between the measured and predicted K. The suggested
approach with the calculated coefficients of the first aquifer is applied for
the second. Results show good correlation with the measured K indicating
that the derived relationship is superior to single phase angle models as
Börner or Slater models. |
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