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Resistivity imaging as a tool in shallow site investigation - A case study

Wisén, Roger LU ; Dahlin, Torleif LU and Auken, E (2004) 2nd International Conference on Site Characterization (ISC-2) In Geotechnical and Geophysical Site Characterization p.607-613
Abstract
Resistivity imaging in combination with drill hole information is a powerful tool in geotechnical site investigations. Traditionally the resistivity data is inverted with a 2D smooth inversion algorithm, resulting in a minimum structure model. In the geological interpretation it can be difficult to determine sharp layer boundaries in these models. An additional parameterized inversion of resistivity data, using few layer models can make the geological interpretation of the geophysical models easier and better. The data presented was collected as part of a site investigation for a 2 kin long and about 10 in deep railway trench. The geology in the area is sedimentary with Quaternary deposits overlaying limestone. The main issue at this stage... (More)
Resistivity imaging in combination with drill hole information is a powerful tool in geotechnical site investigations. Traditionally the resistivity data is inverted with a 2D smooth inversion algorithm, resulting in a minimum structure model. In the geological interpretation it can be difficult to determine sharp layer boundaries in these models. An additional parameterized inversion of resistivity data, using few layer models can make the geological interpretation of the geophysical models easier and better. The data presented was collected as part of a site investigation for a 2 kin long and about 10 in deep railway trench. The geology in the area is sedimentary with Quaternary deposits overlaying limestone. The main issue at this stage of the project was to understand the hydrogeology in the area. The reason for this is to avoid inflow of water to the trench during and after construction. The main aim of this survey was mapping of the thickness and internal structure of the Quaternary deposits. An extensive dataset with geological and geotechnical data from anger- and core-drilling has been available for the geophysical processing and interpretation. We recommend that the traditional 2D smooth inversion of resistivity data is combined with a parameterized layered inversion. In this case the Laterally Constrained Inversion from Aarhus University was used. The possibility to add discrete prior information in the LCI can limit the problem with ambiguity in geophysical inverse modeling. The final model based on both drilling and resistivity data is much enhanced compared to what is achieved using only one of the datasets alone. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
site investigation, inversion, resistivity, applied, geophysics
in
Geotechnical and Geophysical Site Characterization
pages
607 - 613
publisher
Millpress
conference name
2nd International Conference on Site Characterization (ISC-2)
external identifiers
  • WOS:000239478800059
ISBN
978-90-5966-009-0
language
English
LU publication?
yes
id
3f8494aa-48dc-4383-93b1-05be880906be (old id 1410656)
date added to LUP
2009-05-28 15:20:17
date last changed
2016-04-16 08:49:54
@inproceedings{3f8494aa-48dc-4383-93b1-05be880906be,
  abstract     = {Resistivity imaging in combination with drill hole information is a powerful tool in geotechnical site investigations. Traditionally the resistivity data is inverted with a 2D smooth inversion algorithm, resulting in a minimum structure model. In the geological interpretation it can be difficult to determine sharp layer boundaries in these models. An additional parameterized inversion of resistivity data, using few layer models can make the geological interpretation of the geophysical models easier and better. The data presented was collected as part of a site investigation for a 2 kin long and about 10 in deep railway trench. The geology in the area is sedimentary with Quaternary deposits overlaying limestone. The main issue at this stage of the project was to understand the hydrogeology in the area. The reason for this is to avoid inflow of water to the trench during and after construction. The main aim of this survey was mapping of the thickness and internal structure of the Quaternary deposits. An extensive dataset with geological and geotechnical data from anger- and core-drilling has been available for the geophysical processing and interpretation. We recommend that the traditional 2D smooth inversion of resistivity data is combined with a parameterized layered inversion. In this case the Laterally Constrained Inversion from Aarhus University was used. The possibility to add discrete prior information in the LCI can limit the problem with ambiguity in geophysical inverse modeling. The final model based on both drilling and resistivity data is much enhanced compared to what is achieved using only one of the datasets alone.},
  author       = {Wisén, Roger and Dahlin, Torleif and Auken, E},
  booktitle    = {Geotechnical and Geophysical Site Characterization},
  isbn         = {978-90-5966-009-0},
  keyword      = {site investigation,inversion,resistivity,applied,geophysics},
  language     = {eng},
  pages        = {607--613},
  publisher    = {Millpress},
  title        = {Resistivity imaging as a tool in shallow site investigation - A case study},
  year         = {2004},
}