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

Sjodahl, P.; Dahlin, Torleif LU ; Johansson, S. and Loke, M. H. (2008) In Journal of Applied Geophysics 65(3-4). p.155-164
Abstract
Internal erosion is one of the major reasons for embankment dam failures. Despite this, the knowledge of the temporal development of internal erosion in full scale structures is limited. Detection of internal erosion is complicated using conventional methods, and new or improved methods are appreciated. Hallby was the first Swedish embankment to get a permanently installed monitoring system intended for resistivity measurements. Daily measurements started to take place already in late 1996, which make these long term monitoring data unique. This paper includes examples of long term time series from Hallby along with some evaluation and interpretation techniques used when analysing such monitoring data. Time-lapse inversion was used to... (More)
Internal erosion is one of the major reasons for embankment dam failures. Despite this, the knowledge of the temporal development of internal erosion in full scale structures is limited. Detection of internal erosion is complicated using conventional methods, and new or improved methods are appreciated. Hallby was the first Swedish embankment to get a permanently installed monitoring system intended for resistivity measurements. Daily measurements started to take place already in late 1996, which make these long term monitoring data unique. This paper includes examples of long term time series from Hallby along with some evaluation and interpretation techniques used when analysing such monitoring data. Time-lapse inversion was used to focus the variation over time and suppress artefacts due to the resistivity structure. Seasonal resistivity variations inside the dam are obvious. Increasing long term resistivity has been noticed in a particular zone in the left embankment. This zone also exhibits larger seasonal variations relative to other parts of the dam, and the variations are increasing. The observations may relate to an ongoing internal erosion process in the dam. The long term change may be indicative of a change in material properties, and the large and increasing variations may reflect higher and increasing seepage levels. In the years 2004 to 2006 the dam was upgraded and the resistivity system reinstalled. The results indicate that resistivity monitoring may have a chance of detecting development of internal erosion at an early stage. (C) 2008 Published by Elsevier B.V. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Embankment dam, Monitoring, Resistivity, Time-lapse inversion, Leakage
in
Journal of Applied Geophysics
volume
65
issue
3-4
pages
155 - 164
publisher
Elsevier
external identifiers
  • wos:000260271400005
  • scopus:51349165231
ISSN
0926-9851
DOI
10.1016/j.jappgeo.2008.07.003
language
English
LU publication?
yes
id
3c7f1518-d116-4937-b829-d6d296ddb5dc (old id 1284655)
date added to LUP
2009-02-09 09:33:44
date last changed
2017-09-10 04:12:44
@article{3c7f1518-d116-4937-b829-d6d296ddb5dc,
  abstract     = {Internal erosion is one of the major reasons for embankment dam failures. Despite this, the knowledge of the temporal development of internal erosion in full scale structures is limited. Detection of internal erosion is complicated using conventional methods, and new or improved methods are appreciated. Hallby was the first Swedish embankment to get a permanently installed monitoring system intended for resistivity measurements. Daily measurements started to take place already in late 1996, which make these long term monitoring data unique. This paper includes examples of long term time series from Hallby along with some evaluation and interpretation techniques used when analysing such monitoring data. Time-lapse inversion was used to focus the variation over time and suppress artefacts due to the resistivity structure. Seasonal resistivity variations inside the dam are obvious. Increasing long term resistivity has been noticed in a particular zone in the left embankment. This zone also exhibits larger seasonal variations relative to other parts of the dam, and the variations are increasing. The observations may relate to an ongoing internal erosion process in the dam. The long term change may be indicative of a change in material properties, and the large and increasing variations may reflect higher and increasing seepage levels. In the years 2004 to 2006 the dam was upgraded and the resistivity system reinstalled. The results indicate that resistivity monitoring may have a chance of detecting development of internal erosion at an early stage. (C) 2008 Published by Elsevier B.V.},
  author       = {Sjodahl, P. and Dahlin, Torleif and Johansson, S. and Loke, M. H.},
  issn         = {0926-9851},
  keyword      = {Embankment dam,Monitoring,Resistivity,Time-lapse inversion,Leakage},
  language     = {eng},
  number       = {3-4},
  pages        = {155--164},
  publisher    = {Elsevier},
  series       = {Journal of Applied Geophysics},
  title        = {Resistivity monitoring for leakage and internal erosion detection at Hallby embankment dam},
  url          = {http://dx.doi.org/10.1016/j.jappgeo.2008.07.003},
  volume       = {65},
  year         = {2008},
}