Untersuchung von Gasmigration als möglicher Auslöser für submarine Hangrutschungen an Kontinentalhängen (TRISCO)
Geotechnik, Wasserbau
Zusammenfassung der Projektergebnisse
Although collaboration between the TUHH and GEOMAR and project partners at the University of Barcelona suffered signficantly from the effects of the COVID-19 pandemic, scientific questions about the influence of marine gas occurrence in the sub-seafloor could be answered. From the approach of seismic data analysis performed at GEOMAR and geo-technical studies performed at TUHH similar conclusions were reached; that marine gas occurrence has a pre-conditioning effect on slope failure, but it needs an external trigger mechanism to ultimately cause the slope to fail. The implementation of the project was a challenge in that two different disciplines had to be brought together. This was achieved both through frequent exchanges between all those involved in the project and through intensive cooperation at the case worker level. The interdisciplinary nature of the cooperation made it possible to better understand and answer the research question. This is reflected in the results in that methodological responses to each other were made and thus more wide-ranging analyses and interpretations were possible than would have been achieved by the disciplines working individually. The successful collaboration is visible in several joint publications. The outcomes of the studies conducted as part of this project have provided valuable insights into the failure behaviour of gas-influenced submarine slopes in general and that of the Ana slide in particular. A limitation of this study is that the focus of the investigations was on the macroscopic influence of gas in the pore space and larger-scale gas-driven mechanisms such as blow-outs were not considered in detail. These therefore represent a possible starting point for future research in this field. Beyond that, a fundamental and systematic need for research in the field of soil mechanics of gassy soils was identified. This also entails gas migration mechanisms in the subsurface. To better understand the nature of slope failures and what governs them we propose to collect further in-situ samples of the weak layer. Ideally locations should be located inside the source and sink areas, outside the landslide scars, and spaced throughout the Eivissa Channel to examine lateral changes in sedimentology of the weak layer.
Projektbezogene Publikationen (Auswahl)
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A numerical investigation of excess pore pressures and continental slope stability in response to ice-sheet dynamics. Geological Society, London, Special Publications, 500(1), 255-266.
Urlaub, Morelia; Kratzke, Isabel & Hjelstuen, Berit Oline
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Geomechanical behaviour of gassy soils and implications for submarine slope stability: a literature analysis. Geological Society, London, Special Publications, 500(1), 277-288.
Kaminski, P.; Urlaub, M.; Grabe, J. & Berndt, C.
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A new methodology to assess the potential of conjectural trigger mechanisms of submarine landslides exemplified by marine gas occurrence on the Balearic Promontory. Engineering Geology, 295 (2021, 12), 106446.
Kaminski, Pauline; Sager, Thore; Grabe, Jürgen & Urlaub, Morelia
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Geotechnical Laboratory Investigation of Gravity Core M69 392-1. TUHH Open Research (TORE) data repository.
Kaminski, P. & J. Grabe
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Bathymetry-based submarine landslide volume assessments. (2022, 12, 5). American Geophysical Union (AGU).
Sager, Thore F.; Urlaub, Morelia & Berndt, Christian
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Decline in Slope Stability as a Consequence of Gassy Soil in Submarine Slopes on the Balearic Promontory. Volume 9: Offshore Geotechnics (2022, 6, 5). American Geophysical Union (AGU).
Kaminski, Pauline; Grabe, Jürgen; Sager, Thore F. & Urlaub, Morelia
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Development and Emplacement of Ana Slide, Eivissa Channel, Western Mediterranean Sea. Geochemistry, Geophysics, Geosystems, 23(11).
Sager, Thore F.; Urlaub, Morelia; Kaminski, Pauline; Papenberg, Cord; Lastras, Galderic; Canals, Miquel & Berndt, Christian
