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Estimation of Electrode Movements from Sparsely Distributed Reference Points for Time-lapse ERT
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Near Surface Geoscience 2013 - 19th EAGE European Meeting of Environmental and Engineering Geophysics, Sep 2013, cp-354-00030
- ISBN: 978-90-73834-38-5
Abstract
The improving capabilities of ground imaging techniques results in an increased application of geophysical techniques to the characterization of landslides. Time-lapse electrical resistivity tomography (ERT) can provide valuable data (i.e. changes in moisture content) to understand landslide processes in more detail. However, it relies on the exact knowledge of the electrode positions, which on a landslide will change over time. We present three different techniques to estimate electrode positions over time from a given set of reference points. The velocity approach is derived from a linear interpolation of directional movement of the reference points to the initial electrode positions. Another method, the general approach, assumes that the relative position of a point to two vectors remains constant over time. A third approach uses kriging to interpolate a ground movement to the initial electrode positions. The three different methods are applied to a synthetic example and real data, and their performance compared. The general approach is shown to be the most accurate one.