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A Time-lapse Geophysical Model for Detecting Changes in Ground Ice Content Based on Electrical and Seismic Mixing Rules
- 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
This contribution introduces a time-lapse extension of a geophysically-based 4-phase model to calculate ground ice content changes in the context of permafrost degradation due to climate change. The model uses input data from time-lapse Electrical Resistivity Tomography and Refraction Seismic Tomography monitoring and is based on simple petrophysical relationships. In time-lapse formulation, the model is not anymore dependent on time-invariant properties such as porosity, pore water resistivity, cementation exponent and P-wave velocity of rock. The time-lapse 4-phase model was then applied to long-term ERT and RST data from the mountain permafrost site Schilthorn, Swiss Alps, where a substantial ground ice loss could be detected during the past decade.