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Evaluation of Geophysical Techniques to Investigate River Embankments

Evaluation of Geophysical Techniques to Investigate River Embankments E. Niederleithinger (BAM), A. Weller (TUC), R. Lewis (PGSL) & U. Stötzner. Motivation Methods & Results Conclusions. Elbe Flood 2002. Motivation Methods & Results Conclusions. Problems.

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Evaluation of Geophysical Techniques to Investigate River Embankments

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  1. Evaluation of Geophysical Techniques to Investigate River Embankments E. Niederleithinger (BAM), A. Weller (TUC), R. Lewis (PGSL) & U. Stötzner

  2. MotivationMethods & Results Conclusions Elbe Flood 2002

  3. MotivationMethods & Results Conclusions Problems • Recent floods (2002, 2005) caused embankment failures • Many embankments more than 100 years old • No maps or drawings, structure of levees and the soil below unknown • Flood protection state affair: different measures in different states • Geophysics not part of standards and regulations (until now)

  4. Motivation Methods & Results Conclusions What is geophysics? • Measurement of physical fields from the surface to detect subsurface features and parameters • Non-destructive • Fast • Cost-effective • Avoid data gaps • Indirect properties • Sometimes difficult to interpret • Need some time and budget

  5. MotivationMethods & Results Conclusions The project Standard methods • DC-Geoelectrics / resistivity • Induction EM • Refraction seismics • GPR Innovative methods • IP/SIP • RMT • MASW • GPR arrays Test sites • Old homogeneous levee (clay) • Old inhomogeneous levee (clay/sand) • New levee (according to standards) Calibration • Boreholes, CPT, lab….. Partners:

  6. Motivation Methods & Results Conclusions Test Sites Friedersdorf Löbnitz Torgau

  7. Motivation Methods & Results Conclusions Test Site Löbnitz

  8. top soil clay, siltl gravel sand resistivity [Ohm*m] Motivation Methods & Results Conclusions Standard methods: resistivity (1) elevation [m] distance [m] profile 2 crest road terrain surf.

  9. top soil clay, silt gravel sand resistivity [Ohm*m] Motivation Methods & Results Conclusions Standard methods: resistivity (2) distance [m] elevation [m] Profile 1 land Profile 1 water

  10. Motivation Methods & Results Conclusions Innovative methods: RMT depth [m] position [m]

  11. Motivation Methods & Results Conclusions Innovative methods: MASW position [m] elevation [m] shear wave velocity [m/s]

  12. Motivation Methods & Results Conclusions (Innovative) methods: GPR (array) layer pipe road erratic block? elev. [m] position [m]

  13. Content Motivation Methods & Results Outlook Comparison with reality Calibration (by boreholes, sampling, CPT) absolutely required!

  14. Content Motivation Methods & Results Outlook Test Site Löbnitz Rapid reconaissance methods Induction EM (BfG Lorenz, U Köln) Geoelektrics „pulled array“ (IGM/IRIS) GPR-Array (GBM)

  15. Content Motivation Methods & Results Outlook Test Site Löbnitz 3D-GPR Geoelektrik „pulled array“ (IGM/IRIS) Radar-Array (GBM)

  16. Motivation Methods & Results Conclusions Recommendations

  17. Motivation Methods & Results Conclusions Recommendations Integration of geophysics into investigation procedures

  18. Motivation Methods & Results Conclusions

  19. Motivation Methods & Results Conclusions

  20. Motivation Methods & Results Conclusions Conclusions and Outlook Handbook • In German • www.deistrukt.bam.de • Out this month • Translations planned Regulations • New national standard and recommendations on river embankments out this year • Geophysics recommended/required • Deistrukt handbook as reference Outlook • automatisation, multichannel • Fast „non-contact“ methods • International network?

  21. Motivation Methods & Results Conclusions

  22. Motivation Methods & Results Conclusions

  23. Thank you! www.deistrukt.bam.de www.bam.de

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