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CSRMT survey on frozen lakes: opportunities for urban applications
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
SGU.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
(English)Manuscript (preprint) (Other academic)
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-328395OAI: oai:DiVA.org:uu-328395DiVA, id: diva2:1135281
Available from: 2017-08-22 Created: 2017-08-22 Last updated: 2017-09-01
In thesis
1. Development of RMT techniques for urban infrastructure planning: Stockholm Bypass (Förbifart) case study
Open this publication in new window or tab >>Development of RMT techniques for urban infrastructure planning: Stockholm Bypass (Förbifart) case study
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The tensor radio-magnetotelluric (RMT) method has extensively been used in near-surface investigations to obtain resistivity models of the subsurface. The main objective of this thesis is to further develop the RMT survey technique for a less paid attention and challenging environment namely on shallow water bodies and in the urban environment. The other objective is to develop a new processing technique to enhance the resolution and sensitivity of the tensor RMT method. For the first time a data acquisition system called ‘boat-towed RMT’ is introduced that has the capability to measure tensor RMT data on water bodies like lakes and rivers. A RMT survey carried out on Lake Mälaren near the city of Stockholm shows the capability and efficiency of the boat-towed RMT system. The resistivity models obtained from the RMT data are consistent from one line to another and show good correlation with the existing geological and drill core data. In general, a three-layer resistivity model was obtained that has a conductive layer interpreted as lake sediments, which is sandwiched between high resistive bedrock and resistive water column. A coherent discontinuity of low resistivity zone was observed in bedrock across all the lines. It was interpreted to originate from a major fracture zone striking in the direction of water bodies. However, due to the lack of penetration, RMT method alone was insufficient to provide a conclusive interpretation of this. Synthetic analysis was performed and showed that lower frequencies using controlled-sources are required to obtain the desired penetration depth. We took the advantage of the Swedish winters and carried out controlled-source RMT measurements on frozen lake at the same location. The new controlled-source models have enough depth penetration to delineate fractured bedrock. Furthermore, in order to improve the resolution and sensitivity of tensor RMT data, a new processing technique was developed that preserves the identity of each transmitter and allows improved resistivity model of the subsurface. These new acquisition and processing techniques should be useful in many different applications for urban infrastructure planning projects especially in Scandinavia where 7% of the land is covered by fresh water bodies and is poorly explored for these purposes.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2017. p. 53
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1547
National Category
Geophysics
Research subject
Geophysics with specialization in Solid Earth Physics
Identifiers
urn:nbn:se:uu:diva-328398 (URN)978-91-513-0046-7 (ISBN)
Public defence
2017-10-13, Hambergsalen, Geocentrum, Villavägen 16,, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2017-09-22 Created: 2017-08-22 Last updated: 2017-10-17

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