Comparison between 2D and 3D ERT inversion for engineering site investigations – a case study from Oslo Harbour
| Autor: | Asgeir Olaf Kydland Lysdahl, Craig Christensen, Sara Bazin, Thomas Günther, Andreas Aspmo Pfaffhuber, Sven Ahrens |
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| Rok vydání: | 2016 |
| Předmět: |
Regional geology
Engineering geology 0211 other engineering and technologies Inversion (meteorology) Excavation 02 engineering and technology 010502 geochemistry & geophysics 01 natural sciences Iteratively reweighted least squares Paleontology Geophysics Electrical resistivity tomography Economic geology Geology Seismology 021101 geological & geomatics engineering 0105 earth and related environmental sciences Environmental geology |
| Zdroj: | Near Surface Geophysics. 15:201-209 |
| ISSN: | 1873-0604 1569-4445 |
| DOI: | 10.3997/1873-0604.2016052 |
| Popis: | Excavation and piling works related to seafront development in Oslo’s historic harbour area need to mitigate the risk of damaging buried archaeological objects. In the Bjorvika harbour in Oslo, Norway, electrical resistivity tomography was performed to detect structures with potential archaeological value. A 2.5 dataset consisting of four equally spaced parallel lines was collected, trimmed, and systematically processed with both 2D and 3D inversion routines. The results were in good agreement with known underground features, and for the present dataset, an iteratively reweighted least squares 2D inversion was clearly preferable over a 3D inversion. This conclusion is based on differences in model resolution, data processing costs, and the value of the final product for engineering decision-making. |
| Databáze: | OpenAIRE |
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