Constraining electric resistivity tomography by direct push electric conductivity logs and vibracores: An exemplary study of the Fiume Morto silted riverbed (Ostia Antica, western Italy).

Wunderlich, Tina, Fischer, Peter, Wilken, Dennis, Hadler, Hanna, Erkul, Ercan, Mecking, Rebekka, Günther, Thomas, Heinzelmann, Michael, Vött, Andreas and Rabbel, Wolfgang (2018) Constraining electric resistivity tomography by direct push electric conductivity logs and vibracores: An exemplary study of the Fiume Morto silted riverbed (Ostia Antica, western Italy). GEOPHYSICS, 83 (3). B87-B103. DOI 10.1190/geo2016-0660.1.

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Supplementary data:

Abstract

The inversion of geoelectric data is nonunique. Therefore, electric resistivity tomography (ERT) usually results in different subsurface models that fit observed apparent resistivity values equally well. To reduce the uncertainty, constraints on the geometry and resistivity of subsurface structures can be incorporated into the ERT inversion. We test different ways of constraining ERT by applying (1) improved starting models, (2) structural constraints, and (3) structural and resistivity constraints. A priori information is needed for these approaches, which is acquired from direct push electrical conductivity (DP-EC) logs and vibracores in our study. We found that adapting high vertical resolution of DP-EC logs to coarser ERT resolution requires blocking of the logs. These blocked logs can be used for constraining the ERT inversion with resistivity and structural constraints along so-called regions around the log locations, which was found to be the best approach. In this case, ground truthing with additional DP-EC logs that were not used for constraining showed the lowest root-mean-square error between logs and ERT model.

Document Type: Article
Keywords: electrical/resistivity boundary conditions inversion resistivity log tomography
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
Open Access Journal?: No
Publisher: Society of Exploration Geophysicists
Projects: Future Ocean
Date Deposited: 30 Jan 2019 10:48
Last Modified: 08 Feb 2021 07:45
URI: https://oceanrep.geomar.de/id/eprint/45556

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