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Geophysical Techniques for River Embankments Evaluation

Explore how geophysics can assess river embankments, vital for flood protection. Investigate innovative methods, test sites, and recommendations for integration into procedures. Access the Deistrukt handbook for industry standards.

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Geophysical Techniques for River Embankments Evaluation

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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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