Physics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29u..12h&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 21, pp. 12-1, CiteID 2016, DOI 10.1029/2002GL014995
Physics
13
Hydrology: Frozen Ground, Physical Properties Of Rocks: Magnetic And Electrical Properties, Hydrology: Instruments And Techniques, Hydrology: Snow And Ice (1827)
Scientific paper
Time-lapse DC resistivity tomography is shown to be a useful method for permafrost and frozen ground monitoring in high-mountain areas. Resistivity changes are related to freezing and thawing processes and monitor the permafrost evolution over monthly to seasonal time scales. A fixed-electrode array allows measurements independent of the snow cover thickness. The 2-dimensional tomographic approach yields information about spatially variable transient processes, such as the advance and retreat of freezing fronts. In combination with borehole temperature data, differences in total water content at different depths could be estimated. In addition, the temporal evolution of the unfrozen water content was calculated showing a strong decrease during the winter months in the near-surface layer and a quasi-sinusoidal behaviour at greater depths. This approach seems promising for future long-term monitoring programmes of the permafrost evolution at low cost.
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