Simon Loew

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Loew

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Simon

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0000-0003-4014-1425

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Publications 1 - 10 of 177

Dynamic Landslide Deformation Monitoring with Fiber Bragg Grating Sensors
Moore, J.R.; Gischig, Valentin; Button, Edward; et al. (2009)
EOS
Rock slope temperature evolution and micrometer-scale deformation at a retreating glacier margin
Hugentobler, Marc; Aaron, Jordan; Loew, Simon (2021)
ESS Open Archive
In deglaciating environments, rock mass weakening and potential formation of rock slope instabilities is driven by long-term and seasonal changes in thermal- and hydraulic boundary conditions, combined with unloading due to ice melting. However, in-situ observations are rare. In this study, we present new monitoring data from three highly instrumented boreholes, and numerical simulations to investigate rock slope temperature evolution and micrometer-scale deformation during deglaciation. Our results show that the subsurface temperatures are adjusting to a new, warmer surface temperature following ice retreat. Heat conduction is identified as the dominant heat transfer process at sites with intact rock. Observed nonconductive processes are related to groundwater exchange with cold subglacial water, snowmelt infiltration, or creek water infiltration. Our strain data shows that annual surface temperature cycles cause thermoelastic deformation that dominate the strain signals in the shallow thermally active layer at our stable rock slope locations. At deeper sensors, reversible strain signals correlating with pore pressure fluctuations dominate. Irreversible deformation, which we relate with progressive rock mass damage, occurs as short-term (hours to weeks) strain events and as slower, continuous strain trends. The majority of the short-term irreversible strain events coincides with precipitation events or pore pressure changes. Longer-term trends in the strain time series and a minority of short-term strain events cannot directly be related to any of the investigated drivers, but changes of glacial loading and fatigue processes are considered as potential causes.
Mechanisms of Reservoir Impoundment-induced Large Deformation of the Guobu Slope at the Laxiwa Hydropower Station, China: Preliminary Insights from Remote Sensing and Numerical Modelling
Lesche, Moritz; Wang, Liang; Manconi, Andrea; et al. (2024)
Environmental Engineering Science ~ Engineering Geology for a Habitable Earth: IAEG XIV Congress 2023 Proceedings, Chengdu, China. Volume 4: Technological Innovation and Application for Engineering Geology
The construction/operation of ultrahigh arch dams may impose significant perturbations to surrounding mountains, resulting in landslide motions of rock slopes and endangering the safety of hydropower systems and human habitats. For example, the Laxiwa Hydropower Station in China witnessed its nearby Guobu slope displacing significantly after the reservoir impoundment and having so far displaced up to ~40 m. It is of great importance to understand the mechanisms driving this large deformation. Here, we present some preliminary results from a combined remote sensing and numerical modelling investigation of this slope before, during, and after the reservoir impoundment. Analysis based on the differential interferometric synthetic aperture radar (DInSAR) data indicates that the slope had already been actively creeping at a rate of ~10 cm/year (e.g. in years of 2003-2005). We develop a geological model including different rock mass compartments and various discontinuity structures as well as a realistic representation of the suspended ancient landslide. We model the coupled hydro-mechanical and creep behaviour of the slope in response to reservoir impoundment. A good agreement is reached between the simulation results and field measurements of slope displacement time series recorded at different elevations of the slope surface. Our results show that the reservoir impoundment causes notable pressure changes at the toe region of the slope, leading to strong deformations (under coupled poroelastic and primary creep effects) that propagate upslope with the ancient landslide partially reactivated. These deformations tend to decelerate significantly after the impoundment due to the transition to secondary creeps.
Eight years of geoenergy research in SCCER-SoE
Giardini, Domenico; Guidati, Gianfranco; Gischig, Valentin; et al. (2021)
Swiss Bulletin für angewandte Geologie
Corrigendum to “Hydraulic stimulation and fluid circulation experiments in underground laboratories: Stepping up the scale towards engineered geothermal systems” by Gischig et al. https://doi.org/10.1016/j.gete.2019.100175
Gischig, Valentin S.; Giardini, Domenico; Amann, Florian; et al. (2020)
Geomechanics for Energy and the Environment
Application of active and passive seismic methods for characterizing fracturing processes in an unstable rockmass (Randa, Switzerland)
Spillmann, T.; Heincke, B.; Willenberg, H.; et al. (2006)
Geophysical Research Abstracts
Gefährdung des Arlesheimer Doms durch das auf Parzelle Nr. 84 projektierte unterirdische Hallenbad
Loew, Simon; Weber, R.; Huck, E. (2006)
The Grimsel in-situ stimulation project – on the seismo-hydromechanical response during hydraulic stimulation tests
Doetsch, Joseph; Amann, Florian; Gischig, Valentin; et al. (2019)
Abstract Book of the Third Schatzalp Workshop on Induced Seismicity
Deep Groundwater Percolations Inducing Weathering Processes and Strength Degradation at Åknes
Loew, Simon (2006)
Fracture processes and in-situ fracture observations in Gipskeuper
Amann, F.; Ündül, Ö.; Loew, Simon; et al. (2013)
Forschungsauftrag des Bundesamtes für Strassen (ASTRA)

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Simon Loew

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