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| Titel |
A new model for estimating subsurface ice content based on combined electrical and seismic data sets |
| VerfasserIn |
C. Hauck, M. Böttcher, H. Maurer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 5, no. 2 ; Nr. 5, no. 2 (2011-06-01), S.453-468 |
| Datensatznummer |
250002436
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| Publikation (Nr.) |
 copernicus.org/tc-5-453-2011.pdf |
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| Zusammenfassung |
| Detailed knowledge of the material properties and internal structures of
frozen ground is one of the prerequisites in many permafrost studies. In the
absence of direct evidence, such as in-situ borehole measurements,
geophysical methods are an increasingly interesting option for obtaining
subsurface information on various spatial and temporal scales. The indirect
nature of geophysical soundings requires a relation between the measured
variables (e.g. electrical resistivity, seismic velocity) and the actual
subsurface constituents (rock, water, air, ice). In this work, we present a
model which provides estimates of the volumetric fractions of these four
constituents from tomographic electrical and seismic images. The model is
tested using geophysical data sets from two rock glaciers in the Swiss Alps,
where ground truth information in form of borehole data is available. First
results confirm the applicability of the so-called 4-phase model, which
allows to quantify the contributions of ice-, water- and air within
permafrost areas as well as detecting solid bedrock. Apart from a similarly
thick active layer with enhanced air content for both rock glaciers, the two
case studies revealed a heterogeneous distribution of ice and unfrozen water
within Muragl rock glacier, where bedrock was detected at depths of 20–25 m,
but a comparatively homogeneous ice body with only minor heterogeneities
within Murtèl rock glacier. |
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