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Analysis Procedures of an ERT Monitoring Network to Assess Mountain Permafrost Degradation Rate
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 23rd European Meeting of Environmental and Engineering Geophysics, Sep 2017, Volume 2017, p.1 - 5
Abstract
A long-term ERT monitoring network of mountain permafrost in the Swiss Alps allows the detection of ground ice changes. It enables to compare sites of diverse landforms which are characterized by various ground properties. Electrical resistivity is highly sensitive to unfrozen water content present in the pores and to a lesser extent to temperature change. Data quality assessment of the six sites of the ERT monitoring network involves grounding resistance analysis as well as automatic filtering procedures. The combined analysis of borehole temperature and resistivity dataset reveals spatio-temporal ground property changes. This long-term monitoring network enables e.g. to characterize the extent of permafrost thaw and/or melt of ground ice at Schilthorn, to a lesser extent at Stockhorn, and no or very small changes at rock glacier Murtel.