Non-invasive time-lapse imaging of moisture content changes in earth embankments using electrical resistivity tomography (ERT)

The test area (Figure 1) covers a 100 m length of embankment (y =−20 to 80 m), which includes the crest and the two flanks (x = 0 to 31 m). Geotechnical tests (trial pits, boreholes & cone penetration tests), described by Gunn et al. (2007), were restricted primarily to the crest of embankment (x = 8 to 24 m). However, the resistivity images extended the full length and width of the area (Figure 2).