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| Titel |
Impact of changes in grain size and pore space on the hydraulic conductivity and spectral induced polarization response of sand |
| VerfasserIn |
K. Koch, A. Kemna, J. Irving, K. Holliger |
| 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 ; 15, no. 6 ; Nr. 15, no. 6 (2011-06-09), S.1785-1794 |
| Datensatznummer |
250012851
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| Publikation (Nr.) |
 copernicus.org/hess-15-1785-2011.pdf |
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| Zusammenfassung |
| Understanding the influence of pore space characteristics on the hydraulic
conductivity and spectral induced polarization (SIP) response is critical
for establishing relationships between the electrical and hydrological
properties of surficial unconsolidated sedimentary deposits, which host the
bulk of the world's readily accessible groundwater resources. Here, we
present the results of laboratory SIP measurements on industrial-grade,
saturated quartz samples with granulometric characteristics ranging from
fine sand to fine gravel. We altered the pore space characteristics by
changing (i) the grain size spectra, (ii) the degree of compaction, and
(iii) the level of sorting. We then examined how these changes affect the
SIP response, the hydraulic conductivity, and the specific surface area of
the considered samples. In general, the results indicate a clear connection
between the SIP response and the granulometric as well as pore space
characteristics. In particular, we observe a systematic correlation between
the hydraulic conductivity and the relaxation time of the Cole-Cole model
describing the observed SIP effect for the entire range of considered grain
sizes. The results do, however, also indicate that the detailed nature of
these relations depends strongly on variations in the pore space
characteristics, such as, for example, the degree of compaction. This
underlines the complexity of the origin of the SIP signal as
well as the difficulty to relate it to a single structural factor of a
studied sample, and hence raises some fundamental questions with regard to
the practical use of SIP measurements as site- and/or sample-independent
predictors of the hydraulic conductivity. |
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