Post flooding damage assessment of earth dams and historical reservoirs using non-invasive geophysical techniques

Phillippe Sentenac, Vojtech Benes, Vladimir Budinski, Helen Keenan, Ron Baron (Illustrator)

Research output: Contribution to journalArticle

8 Citations (Scopus)
16 Downloads (Pure)

Abstract

This paper describes the use of four geophysical techniques to map the structural integrity of historical earth reservoir embankments which are susceptible to natural decay with time.

The four techniques that were used to assess the post flood damage were 1. A fast scanning technique using a dipole electromagnetic profile apparatus (GEM2), 2. Electrical Resistivity Tomography (ERT) in order to obtain a high resolution image of the shape of the damaged/seepage zone, 3. Self-Potential surveys were carried out to relate the detected seepage evolution and change of the water displacement inside the embankment, 4. The washed zone in the areas with piping was characterised with microgravimetry.

The four geophysical techniques used were evaluated against the case studies of two reservoirs in South Bohemia, Czech Republic. A risk approach based on the Geophysical results was undertaken for the reservoir embankments. The four techniques together enabled a comprehensive non-invasive assessment whereby remedial action could be recommended where required. Conclusions were also drawn on the efficiency of the techniques to be applied for embankments with wood structures.
Original languageEnglish
Pages (from-to)138-148
Number of pages11
JournalJournal of Applied Geophysics
Volume146
Early online date8 Sep 2017
DOIs
Publication statusPublished - 30 Nov 2017

Keywords

  • geophysics
  • monitoring applications
  • reservoir engineering
  • flood embankment

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