Resistivity monitoring for leakage and internal erosion detection at Hallby embankment dam

TLDR: In this article, the authors used time-lapse inversion to focus the variation over time and suppress artefacts due to the resistivity structure of Hallby dam, and found that increasing long term resistivity has been noticed in a particular zone in the left embankment.

About: This article is published in Journal of Applied Geophysics.The article was published on 2008-09-01 and is currently open access. It has received 126 citations till now. The article focuses on the topics: Embankment dam & Internal erosion.

Figures

Fig. 4. Raw data (apparent resistivities) and filtered data from two specific measurement configurations on Hällby left dam crest. Left: Wenner–Schlumberger array with midpoint at chainage −38 m, a-spacing 7 m and n-factor=1. Right: Wenner–Schlumberger array with midpoint at chainage −52 m, a-spacing 7 m and n-factor=7.

Fig. 5. Raw data and filtered data between 1997-09-24 and 2005-05-08 from two specific me Wenner–Schlumberger array with midpoint at chainage −32 m, a-spacing 21m and n-factor= and n-factor=1.

Fig. 6. Median inverted resistivity distribution (left) and its relative variation (right) at Hällby left dam crest between 1997-09-24 and 2005-05-08.

Fig. 11. Examples of time series of inverted resistivity data at four different depths from two different locations upstream Hällby left dam; Chainage −68.25 m (above) and chainage −22.75 m (below) (approx. length marks).

Fig. 10. Median inverted resistivity distribution (left) and its relative variation (right) upstream Hällby left dam between 1997-09-24 and 2005-05-08 (approx. length marks).

Fig. 1. Map over Hällby dam area. Principal location of electrodes marked out.