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Urban underwater ERT for site investigation in lake Mälaren, Sweden

Dahlin, T. LU ; Wisén, R. LU and Rossi, M. LU (2016) 22nd European Meeting of Environmental and Engineering Geophysics, Near Surface Geoscience 2016
Abstract

An underwater ERT survey was made along a planned road tunnel for The Stockholm Bypass Project (Förbifart Stockholm). The aim was to assess the ability to identify variations in the depth of the bottom sediments, as well as variations in rock quality and the possible presence of weak zones in the rock. Reference data from a seismic survey and geotechnical drilling was used for evaluation the result. An underwater layout of 121 underwater and 37 land based electrodes at a separation of 5 m was used. Repeated measurements were made to assess the temporal variation in urban noise, which lead to doing the actual survey during the quiet night hours. The resistivity data are of good quality and the inversion results in low residuals. The... (More)

An underwater ERT survey was made along a planned road tunnel for The Stockholm Bypass Project (Förbifart Stockholm). The aim was to assess the ability to identify variations in the depth of the bottom sediments, as well as variations in rock quality and the possible presence of weak zones in the rock. Reference data from a seismic survey and geotechnical drilling was used for evaluation the result. An underwater layout of 121 underwater and 37 land based electrodes at a separation of 5 m was used. Repeated measurements were made to assess the temporal variation in urban noise, which lead to doing the actual survey during the quiet night hours. The resistivity data are of good quality and the inversion results in low residuals. The invested section shows a low resistivity layer corresponding to sediments on top of bedrock with varying resistivity, where the interpreted depth to bedrock is in good accordance with the reference data. A major low resistive zone corresponds well with poor quality rock according to drilling and a low velocity zone.

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publishing date
type
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publication status
published
subject
host publication
22nd European Meeting of Environmental and Engineering Geophysics, Near Surface Geoscience 2016
publisher
European Association of Geoscientists and Engineers
conference name
22nd European Meeting of Environmental and Engineering Geophysics, Near Surface Geoscience 2016
conference location
Barcelona, Spain
conference dates
2016-09-04 - 2016-09-08
external identifiers
  • scopus:85085850686
project
Integrated Use and Interpretation of Data from Geophysical and Non-Geophysical Methods for Site Investigation for Underground Construction
language
English
LU publication?
yes
id
c3e3c5c0-59d7-49b4-aea8-44830b1b4562
date added to LUP
2017-04-24 15:24:22
date last changed
2022-01-30 19:45:48
@inproceedings{c3e3c5c0-59d7-49b4-aea8-44830b1b4562,
  abstract     = {{<p>An underwater ERT survey was made along a planned road tunnel for The Stockholm Bypass Project (Förbifart Stockholm). The aim was to assess the ability to identify variations in the depth of the bottom sediments, as well as variations in rock quality and the possible presence of weak zones in the rock. Reference data from a seismic survey and geotechnical drilling was used for evaluation the result. An underwater layout of 121 underwater and 37 land based electrodes at a separation of 5 m was used. Repeated measurements were made to assess the temporal variation in urban noise, which lead to doing the actual survey during the quiet night hours. The resistivity data are of good quality and the inversion results in low residuals. The invested section shows a low resistivity layer corresponding to sediments on top of bedrock with varying resistivity, where the interpreted depth to bedrock is in good accordance with the reference data. A major low resistive zone corresponds well with poor quality rock according to drilling and a low velocity zone.</p>}},
  author       = {{Dahlin, T. and Wisén, R. and Rossi, M.}},
  booktitle    = {{22nd European Meeting of Environmental and Engineering Geophysics, Near Surface Geoscience 2016}},
  language     = {{eng}},
  publisher    = {{European Association of Geoscientists and Engineers}},
  title        = {{Urban underwater ERT for site investigation in lake Mälaren, Sweden}},
  year         = {{2016}},
}