Kruse_NS_AP_resistivity
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The document discusses using electrical resistivity tomography (ERT) to detect sinkholes. It provides an example of a typical sinkhole formation with overlying sand, clay and limestone layers. It then outlines how ERT can be used with different electrode array configurations, including surface arrays and buried electrode (MERIT) arrays, to image subsurface features like cavities associated with sinkholes. The optimal array choice depends on factors like depth of investigation needed, resistivity contrasts between geological layers, and access limitations of the survey area.
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Kruse_NS_AP_resistivity
- 1. Henok Kiflu School of Geosciences, University of South Florida David Harro G3 Group Forensic Consulting Sarah Kruse School of Geosciences, University of South Florida
- 5. Or worse…
- 7. Example sinkhole Stewart & Parker, 1992 Sand
- 8. Example sinkhole Stewart & Parker, 1992 sand Clay
- 9. Example sinkhole Stewart & Parker, 1992 sand Weathered Limestone
- 10. Example sinkhole Stewart & Parker, 1992 sand Limestone
- 12. Example sinkhole Stewart & Parker, 1992 sand Clay
- 14. cavity
- 15. cavity
- 16. x x
- 18. houses
- 19. Survey length limited by size of residential lot
- 20. Optimize geometry of readings with ‘Compare R’ method of Wilkinson and Loke “Horizontal cross borehole”-can use lessons learned from cross-borehole methods
- 21. 15-30 min per electrode works through asphalt Leave deep electrodes for time-lapse monitoring
- 22. Surface array Surface + buried array(MERIT) Must have buried electrodes within depth of sensitivity of surface array
- 24. Surface only Surface and deep electrodes
- 25. Moderate clay-limestone resistivity contrast High clay-limestone resistivity contrast
- 27. surface array Surface and Deep Array
- 28. Urban site example array length limited by access
- 31. 5.3 m 2.3 m 0m
Editor's Notes
- Not true in March 2013 in Seffner, where a man vanished into a sinkhole.
- Not true in March 2013 in Seffner, where a man vanished into a sinkhole.
- 15 minutes to install electrode to 8 m depth, leaves small footprint, can be reused, could be done inside structure. Much cheaper than cross-borehole because can be installed with geoprobe or direct push and doesn’t require conventional drilling techniques.
- 7 hours to install array
- 7 hours to install array