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Research & Publications

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Research

At the moment there is ongoing research in the fields of

- temperature measurements on embankment dams for seepage detection and seepage quantification

- resistivity monitoring of embankment dams

Publications

2011

  • Johansson S, Sjödahl P (2011) Numerical Modeling of Seepage and Temperature for Internal Erosion Detection in Embankment Dams. 11th ICOLD Benchmark Workshop on Numerical Analysis of Dams, 20-21 October 2011, Valencia, Spain, 6p

  • Sjödahl P, Johansson S, Dahlin T (2011) Investigation of shallow leakage zones in a small embankment dam using repeated resistivity measurements. Internal erosion in embankment dams and their foundations, ed. J-J Fry, J Riha, T Julinek , ISBN 978-80-7204-736-9, Proceedings of the Institute of Water Structures FCE BUT Brno, Volume 13, 26-29 April 2011, Brno, Czech Republic, p 165-172

2010

  • Sjödahl P, Dahlin T, Johansson S (2010) Using the resistivity method for leakage detection in a blind test at the Røssvatn embankment dam test facility in Norway. Bulletin of Engineering Geology and the Environment 69: 643-658

2009

  • Johansson S, Sjödahl P (2009) A Guide for Seepage Monitoring of Embankment Dams using Temperature Measurements. Canadian Electricity Association - Dam Safety Interest Group CEATI Report No T062700-0214

  • Sjödahl P, Dahlin T, Johansson S (2009) Embankment dam seepage evaluation from resistivity monitoring data. Near Surface Geophysics 2009 (7): 463-474

  • Sheffer MR, Johansson S, Sjödahl P (2009) Recent Developments in the Use of Temperature, Resistivity and Self-Potential Methods for Monitoring Embankment Dam Performance. CDA 2009 Annual Conference CANADIAN DAM ASSOCIATION, 3-8 October 2009, Whistler, BC, Canada, 15p

  • Ekström I, Cederström M, Johansson S, Sjödahl P (2009) Upgrading of an old power plant for new environmental and technical requirements. Procs. International Commission on Large Dams (ICOLD), 23th Congress, Q.90, 25-29 May 2009, Brasilia, Brazil

2008

  • Sjödahl P, Dahlin T, Johansson S, Loke MH (2008) Resistivity monitoring for leakage and internal erosion detection at Hällby embankment dam. Journal of Applied Geophysics 65 (3-4): 155-164

  • Sjödahl P, Dahlin T, Johansson S, Loke MH (2008) Resistivity monitoring for leakage and internal erosion detection at Hällby embankment dam. Journal of Applied Geophysics 65 (3-4): 155-164

  • Dahlin T, Sjödahl P, Johansson S (2008) Embankment Dam Seepage Evaluation by Resistivity Monitoring. Procs. Near Surface 2008 - 14th European Meeting Environmental and Engineering Geophysics, 15-17 September 2008, Krakow, Poland, 4p

2007

  • Johansson S, Sjödahl P, Cooney H (2007) Seepage monitoring in embankment dams using distributed temperature sensing in optical fibres – Experiences from Swedish dams. International Symposium on Modern Technology of Dams - The 4th EADC Symposium, 12-18 October 2007, Chengdu, China: 564-571
  • Sjödahl P, Johansson S, Dahlin T (2007) Experiences from resistivity monitoring in embankment dams. International Symposium on Modern Technology of Dams - The 4th EADC Symposium, 12-18 October 2007, Chengdu, China: 679-687
  • Sjödahl P, Dahlin T, Johansson S (2007) Seepage assessment in embankment dams using the resistivity method. 14th German Dam Symposium and 7th ICOLD European Club Dam Symposium, 17-19 September 2007, Freising, Germany: 462-466
  • Johansson S, Sjödahl P (2007) Experiences from Seepage Monitoring using Distributed Temperature Sensing in Optical Fibres. 14th German Dam Symposium and 7th ICOLD European Club Dam Symposium, 17-19 September 2007, Freising, Germany: 212-217

2006

  • Sjödahl P (2006) Resistivity investigation and monitoring for detection of internal erosion and anomalous seepage in embankment dams. Doctoral Thesis, ISRN LUTVDG/TVTG—1017-SE, ISBN 978-91-973406-5-6, Lund University, Lund, p 86

  • Sjödahl P, Dahlin T, Johansson S (2006) Defect detection using resistivity measurements - experiences from a field test dam and large embankment dams in Sweden. Procs. International Commission on Large Dams (ICOLD), 22th Congress, Q.86, 18-23 June 2006, Barcelona, Spain: 965-981

  • Sjödahl P, Dahlin T, Johansson S (2006) Defect detection using resistivity measurements - experiences from a field test dam and large embankment dams in Sweden. Procs. International Commission on Large Dams (ICOLD), 22th Congress, Q.86, 18-23 June 2006, Barcelona, Spain: 965-981

  • Sjödahl P, Dahlin T, Johansson S, Loke MH (submitted) Resistivity monitoring for leakage and internal erosion detection at Hällby embankment dam. Journal of Applied Geophysics (in review)

  • Sjödahl P, Zhou B, Dahlin T (2006) 2.5D Resistivity Modeling of Embankment Dams to Assess Influence from Geometry and Material Properties. Geophysics 71: 107-114

2005

  • Sjödahl P., Dahlin T. and Johansson S. (June 2005) Using Resistivity Measurements for Dam Safety Evaluation at Enemossen Tailings Dam in Southern Sweden, Environmental Geology.

  • Johansson, S., Friborg, J., Dahlin, T. and Sjödahl, P. (2005) Internal Erosion Detection at the Røsvatn Test Site – Pre-Study and Field Measurements using Resistivity, Self Potential, and Temperature, Elforsk, Stockholm,78p. Download

  • Johansson, S., Friborg, J., Claesson, J., Dahlin, T., Hellström, G. and Zhou, B. (2005) A Parameter Study for Internal Erosion Monitoring, Canadian Electricity Association - Dam Safety Interest Group (CEA-DSIG)

  • Johansson, S., Friborg, J., Dahlin, T. and Sjödahl, P. (2005) Long Term Resistivity and Self Potential Monitoring of Embankment Dams – Experiences from Hällby and Sädva Dams, Sweden, Elforsk/Canadian Electricity Association - Dam Safety Interest Group (CEA-DSIG), Elforsk report 05:15, Stockholm, 123p. Download

  • Johansson, S., and Watley D. (2005) Optical allusions, International Waterpower & Dam Construction, Vol 57 Number 1, ISSN 0306-400X, p22-23, and 25. Download

2004

  • Johansson, S. (2004) Detection of Internal Erosion in Embankment Dams – Possible Methods in Theory and Practice. Proceedings - Stability and Breaching of Embankment Dams, EBL, Oslo, 24p.

    Dahlin, T., Sjödahl, P., Friborg, J., and Johansson, S., (2004) Defect Detection using Measurements of Resistivity and Self Potential – Experiences from Field Test Dam and Large Embankment Dams in Sweden. Procs. Stability and Breaching of Embankment Dams, EBL, Oslo, 29p.

  • Johansson, S. and Sjödahl, P. 2004. Downstream Seepage Detection using Temperature Measurements and Visual Inspection – Monitoring Experiences from Røsvatn Field Test Dam and Large Embankment Dams in Sweden, Procs. Stability and Breaching of Embankment Dams, EBL, Oslo, 20p.

  • Sjödahl P., Dahlin T. and Johansson S. (2004) Using resistivity measurements for dam safety evaluation at Enemossen tailings dam, Procs. 9th Meeting Environmental and Engineering Geophysics, Utrecht, The Netherlands, 6-9 September 2004, A017, 4p.

  • Sjödahl P., Dahlin T. and Johansson S. (2004) Resistivity monitoring for internal erosion detection at Hällby embankment dam, Procs. ICEEG 2004, Wuhan, China, 6p.

2003

  • Johansson, S., Mill, O, Fridolf, T., Hammar, L (2003) Kompetensförsörjning inom älv- och dammsäkerhet – En behovsstudie av högskoleutbildning och forskning., Elforsk rapport 03:28, Stockholm, 16p. www.elforsk.se

  • Johansson, S., Farhaidroushan, M, Parker T., and Watley, D. (2003) Distributed Strain Measurements for Embankment Dams. Laboratory Tests, Installation, and Monitoring Experiences, Report 03:19, Elforsk, Stockholm, 22p. www.elforsk.se

  • Salmon, G. M., and Johansson, S. (2003). Research on Geophysical Methods of Detecting Seepage and Piping in Embankment Dams with Case Studies of Geophysical Measurements at Two Swedish Tailings Dams. Challenges in Tailing dams on June 15, Montreal 2003, ICOLD.

  • Sjödahl P., Dahlin T. and Johansson S. (2003) Resistivity monitoring for leakage detection at Hällby embankment dam, Procs. 9th Meeting Environmental and Engineering Geophysics, Prague, Czech Republic, 31 August-4 September 2003, O-015, 4p.

2002

  • Sjödahl P., Dahlin T., Zhou B., Johansson S (2002) Monitoring of leakage in embankment dams through resistivity measurements – a 2.5D modelling study, Procs. 8th Meeting Environmental and Engineering Geophysics, Aveiro, Portugal, 8-12 September 2002 (CD-ROM), 169-172.

  • Hultman R. and Johansson, S. (2002) Kontinuerlig mätning av rörelser i undermarksanläggningar och slänter med fiberoptik, Förstudie (Monitoring of displacements in rock openings and slopes with fibre optical cables, Pre-study) SveBeFo Rapport K20, Stockholm, 18p.

2001

  • Dahlin, T., Sjödahl, P., Friborg, J. and Johansson, S. (2001) Resistivity and SP Surveying and Monitoring at the Sädva Embankment Dam, Sweden, in Dams in a European Context, ed. G.H. Mistømme, B. Honningsvåg, K. Repp, K.A. Vaskinn and T. Westeren, ISBN 90 5809 196 1, Balkema, Lisse, p.107-113.

  • Bergman, M., and Johansson, S. (2001) Scientific workshop on internal erosion monitoring, Report 01:21, Elforsk, Stockholm, 62p. www.elforsk.se

2000

  • Johansson, S., Farhadiroushan, M. and Parker, T. (2000): Application of fibre-optics systems in embankment dams for temperature, strain and pressure measurements – some comparisons and experiences Proc. ICOLD 20th Congress, Beijing, China.

  • Johansson, S, Dahlin, T., and Friborg, J. (2000): Seepage Monitoring by Continuous Measurements of Resistivity and Streaming Potential in Hällby and Sädva Embankment Dams, Sweden. Proc. ICOLD 20th Congress, Beijing, China.

  • Johansson, S., Dahlin, T., Farhadrioushan, M. and Friborg, J. (2000) New and Improved Monitoring Systems for Embankment Dams – Experience from Initial Resistivity, SP, Strain and Temperature Measurements at Sädva Dam, Report 00:14, Elforsk, Stockholm, 23p. www.elforsk.se

  • Johansson, S., Dahlin, T. and Friborg, J. (2000) Seepage Monitoring by Resistivity and Streaming Potential Measurements at Hällby Embankment Dam 1996-1999, Report 00:15, Elforsk, Stockholm, 47p. www.elforsk.se

1999

  • Johansson, S. and Dahlin, T. (1999) Övervakning av läckage i fyllningsdammar genom resistivitetsmätning, Report 99:8, Elforsk, Stockholm, 55p. www.elforsk.se

  • Johansson, S., Farhaidroushan, M (1999) Fibre-Optic System for Temperature Measurements at the Lövön Dam, Report 99:36, Elforsk, Stockholm, 25p. www.elforsk.se

1998

  • Johansson, S. and Dahlin, T. (1998) Seepage monitoring in Hällby embankment dam by continuous resistivity measurements, in Procs. 8th Congress of the International Ass. of Eng. Geology and the Environment, Vancouver, 21-25 September 1998, ed. D. Moore and O. Hungr, ISBN 90 5410 990 4, Balkema, Rotterdam, p 95-102.

1997

  • Johansson, S. (1997), Seepage Monitoring in Embankment Dams, Doctoral Thesis, TRITA-AMI PHD 1014, ISBN 91-7170-792-1, Royal Institute of Technology, Stockholm. Download (2005-10-13)

  • Johansson, S. (1997) Internal Erosion Detection And Seepage Monitoring In Embankment Dams By Temperature And Resistivity Measurements, Proc. ICOLD 19th Congress Q73, Firenze, Italy.

  • Johansson, S. (1997) Sammanställning av undersökningar vid W.A.C. Bennett Dam, Canada Elforsk rapportnummer: 97:31B, Stockholm, 10p. www.elforsk.se

1996

  • Johansson, B., Johansson S. and Nilsson R.(1996): Repair of the Embankment Dam at Porjus Powerstation - Investigations, Repair and Monitoring. Proceedings Repair and Upgrading of Dams, Stockholm 1996. KTH TRITA-AMI report 3021, ISSN 1400-1306.

  • Johansson, S. (1996) Seepage monitoring in embankment dams by temperature and resistivity measurements, Repair and Monitoring. Proceedings Repair and Upgrading of Dams, Stockholm 1996.

  • Johansson, S. and Dahlin, T. (1996) Seepage monitoring in an earth embankment dam by repeated resistivity measurements, European Journal of Engineering and Environmental Geophysics, 1(3), 229-247. Download

1995

  • Carlsten, S., Johansson, S., and Wörman, A. (1995). Radar techniques for indicating internal erosion in embankment dams., Journal of Applied Geophysics 33 p143-156.

  • Dahlin, T. and Johansson, S. (1995) Resistivity Variations in an Earth Embankment Dam in Sweden, Procs. 1st Meting Environmental and Engineering Geophysics, Torino, 25-27 September 1995, 4p.

  • Johansson, S., Bartsch, M., Landin, O., Barmen, G., Dahlin, T., and Ulriksen, P. (1995) Nyare metoder för tillståndskontroll av fyllningsdammar, VASO dammkommittés rapport nr 21, ISSN 1400-7827, Stockholm, 71p. www.elforsk.se

  • Dahlin, T. and Johansson, S. (1995) Övervakning av tätkärnans funktion genom analys av resistivitetsvariationer, VASO dammkommittés rapport nr 24, ISSN 1400-7827, Stockholm, 41p. www.elforsk.se

1994

  • Dahlin, T., Johansson, S. and Landin, O. (1994) Resistivity Surveying for Planning of Infrastructure, in Procs. SAGEEP'94 (Symposium on the Application of Geophysics to Engineering and Environmental Problems), Boston, Massachusetts 27-31 March 1994, p 509-528.

  • Johansson, S. (1994), Monitoring during ongoing internal erosion and after restoration of the embankment dam at Porjus power station, Sweden, Proc. ICOLD 18th Congress, Volume 5, Durban, South Africa.

1991

  • Johansson, S. (1991) Localization and quantification of water leakage in ageing embankment dams by regular temperature measurements, Proc. ICOLD 17th Congress, Q65, R54, Vienna, Austria.

  • Johansson, S. Landin, O., and Ulriksen, P. (1991) Lokalisering av tätkärnans krön med georadar. VAST Stockholm, 97p.