slide 1niederleithinger bam viii.2 flood defence 2008 toronto evaluation of geophysical techniques...
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Slide 1Niederleithinger BAM VIII.2 Flood Defence 2008 Toronto
Evaluation of Geophysical Techniques to Investigate River Embankments
E. Niederleithinger (BAM), A. Weller (TUC), R. Lewis (PGSL) & U. Stötzner
Slide 2Niederleithinger BAM VIII.2 Flood Defence 2008 Toronto
Elbe Flood 2002
Motivation Methods & Results Conclusions
Slide 3Niederleithinger BAM VIII.2 Flood Defence 2008 Toronto
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)
Motivation Methods & Results Conclusions
Slide 4Niederleithinger BAM VIII.2 Flood Defence 2008 Toronto
What is geophysics?
Measurement of physical fields from the surface to detect subsurface features and parameters
Non-destructiveFastCost-effectiveAvoid data gaps
MotivationMotivation Methods & Results Conclusions Methods & Results Conclusions
Indirect propertiesSometimes difficult to interpretNeed some time and budget
Slide 5Niederleithinger BAM VIII.2 Flood Defence 2008 Toronto
The project
Partners:
Standard methods DC-Geoelectrics / resistivity Induction EM Refraction seismics GPRInnovative 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…..
Motivation Methods & Results Conclusions
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Test Sites
Motivation Methods & Results Conclusions
Friedersdorf
Löbnitz
Torgau
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Test Site Löbnitz
Motivation Methods & Results Conclusions
Slide 8Niederleithinger BAM VIII.2 Flood Defence 2008 Toronto
Standard methods:resistivity (1)
distance [m]
elev
atio
n [
m]
top soil
clay,siltl
gravel
sand
Motivation Methods & Results Conclusions
resistivity [Ohm*m]
profile 2road crest
terrain surf.
Slide 9Niederleithinger BAM VIII.2 Flood Defence 2008 Toronto
Standard methods:resistivity (2)
Profile 1
elev
atio
n [
m]
top soil
clay,silt
gravel
sand
Motivation Methods & Results Conclusions
resistivity [Ohm*m]
land waterProfile 1
distance [m]
Slide 10Niederleithinger BAM VIII.2 Flood Defence 2008 Toronto
Innovative methods:RMT
position [m]
dep
th [
m]
Motivation Methods & Results Conclusions
Slide 11Niederleithinger BAM VIII.2 Flood Defence 2008 Toronto
Innovative methods:MASW
position [m]
elev
atio
n [
m]
shear wave velocity [m/s]
Motivation Methods & Results Conclusions
Slide 12Niederleithinger BAM VIII.2 Flood Defence 2008 Toronto
(Innovative) methods: GPR (array)
position [m]
elev
. [m
] piperoad
layererratic block?
Motivation Methods & Results Conclusions
Slide 13Niederleithinger BAM VIII.2 Flood Defence 2008 Toronto
Comparison with reality
Content Motivation Content Motivation Methods & ResultsMethods & Results Outlook Outlook
Calibration (by boreholes, sampling, CPT) absolutely required!
Slide 14Niederleithinger BAM VIII.2 Flood Defence 2008 Toronto
Test Site LöbnitzRapid reconaissance methods
Induction EM (BfG Lorenz, U Köln)
Geoelektrics „pulled array“ (IGM/IRIS)
GPR-Array (GBM)
Content Motivation Content Motivation Methods & ResultsMethods & Results Outlook Outlook
Slide 15Niederleithinger BAM VIII.2 Flood Defence 2008 Toronto
Geoelektrik „pulled array“ (IGM/IRIS)
Radar-Array (GBM)
Test Site Löbnitz3D-GPR
Content Motivation Content Motivation Methods & ResultsMethods & Results Outlook Outlook
Slide 16Niederleithinger BAM VIII.2 Flood Defence 2008 Toronto
Recommendations
Motivation Methods & Results Conclusions
Slide 17Niederleithinger BAM VIII.2 Flood Defence 2008 Toronto
RecommendationsIntegration of geophysics into investigation procedures
Motivation Methods & Results Conclusions
Slide 18Niederleithinger BAM VIII.2 Flood Defence 2008 Toronto
Motivation Methods & Results Conclusions
Slide 19Niederleithinger BAM VIII.2 Flood Defence 2008 Toronto
Motivation Methods & Results Conclusions
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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?
Motivation Methods & Results Conclusions
Slide 21Niederleithinger BAM VIII.2 Flood Defence 2008 Toronto
Motivation Methods & Results Conclusions
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Motivation Methods & Results Conclusions
Slide 23Niederleithinger BAM VIII.2 Flood Defence 2008 Toronto
Thank you!
www.deistrukt.bam.dewww.bam.de