A5019126688- Cryospheric studies and observations
- Landslides and related hazards
- Climate change and permafrost
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Geology and Paleoclimatology Research
- Geophysical Methods and Applications
- Winter Sports Injuries and Performance
- Meteorological Phenomena and Simulations
- Flood Risk Assessment and Management
- earthquake and tectonic studies
- Arctic and Antarctic ice dynamics
- Seismic Waves and Analysis
- Methane Hydrates and Related Phenomena
- Intermetallics and Advanced Alloy Properties
- Geophysical and Geoelectrical Methods
- Geological Studies and Exploration
- GNSS positioning and interference
- Fire effects on ecosystems
- Advanced Materials Characterization Techniques
- Smart Materials for Construction
- Remote Sensing and LiDAR Applications
- Geological Modeling and Analysis
- Atmospheric and Environmental Gas Dynamics
- Soil Moisture and Remote Sensing
- Geological formations and processes
University of Oslo
2007-2024
Norwegian Geotechnical Institute
2014-2023
University of Zurich
1998-2007
Westinghouse Electric (United States)
1968-1969
Using mass spectroscopic and ultrahigh vacuum techniques, solution diffusion of hydrogen in tungsten was investigated for pressures between 600 10−8 Torr temperatures 1100 2400 K. Solubility constants are derived from degassing rates a solid cylinder which pre-loaded with at ≈600 Torr. The solubility constant, S=2.9×10−1×exp (−24000/RT) liter/cm3Torr1/2, the D=4.1×10−3×exp (−9000/RT) cm2/sec, obtained, conjunction literature values permeation constant P consistent equation P=SD. Comparison...
Regional early warning systems for landslides rely on historic data to forecast future events and verify improve alarms. However, databases of landslide are often spatially biased towards roads or other infrastructure, with few reported in remote areas. In this study, we demonstrate how Google Earth Engine can be used create multi-temporal change detection image composites freely available Sentinel-1 -2 satellite images, order visibility facilitate detection. First, multispectral Sentinel-2...
Using ultrahigh-vacuum and mass-spectroscopic techniques, permeation of hydrogen through wrought-and vapor-deposited W tubes a drawn Mo tube has been measured for pressures between 10−6 200 torr temperatures 1050° 2400°K. Permeation rates varied with pressure temperature in complex manner. Expressions the rate are derived on assumptions that (a) determining step is diffusion bulk sample, (b) desorption atoms Da, recombinative molecules Dm, concentration dissolved each determined by adsorbed...
This work concerns a proposal of the integration InSAR (Interferometric Synthetic Aperture Radar) data acquired by ground-based (GB) and satellite platforms. The selected test site is Åknes rockslide, which affects western Norwegian coast. availability GB-InSAR accessibility wide literature make landslide suitable for testing proposed procedure. first step consists organization geodatabase, performed in GIS environment, containing all available data. second analysis data, separately. Two...
Abstract Climate and its long-term variability govern ground thermal conditions, for this reason represent one of the most important impacts on creeping mountain permafrost. The decoding better understanding present-day morphology distribution rock glaciers opens up a variety insights into past present environmental, especially climatic, conditions local to regional scale. study was carried out in Swiss Alps using two different approaches: (1) kinematic analysis specific active glaciers, (2)...
In this paper three different techniques for detecting and quantifying mountain permafrost creep are compared: (1) rock glacier inventory characterization from in situ indicators, (2) space-borne radar interferometry, (3) digital processing of repeated airborne imagery. The specific characteristics the methods their complementarity investigated Fletschhorn range Simplon/Saas valley region, Swiss Alps. We found that interferometry is suitable to quantify degree activity order surface velocity...
Lake Hövsgöl is located on the southern fringe of continuous permafrost zone in northern Mongolia. This paper describes a GIS-based empirical model that calibrated with ground temperature observations, and utilises multi-criteria approach to derive zones favourability based terrain parameters land cover information. The scores are derived either by logistic regression or from satellite image validated DC resistivity tomography measurements. overall distribution study area well-described...
Abstract. Snow avalanches in mountainous areas pose a significant threat to infrastructure (roads, railways, energy transmission corridors), personal property (homes) and recreational as well for lives of people living moving alpine terrain. The impacts snow range from delays financial loss through road railway closures, destruction infrastructure, life. Avalanche warnings today are mainly based on meteorological information, pack field observations, historically recorded avalanche events...
Worldwide glacier mass changes are considered to represent natural key variables within global climate-related monitoring programmes, especially with respect strategies concerning early detection of enhanced greenhouse effects on climate. This is due the fact that provide important quantitative information rates change, acceleration tendencies and pre-industrial variability relating energy exchange at earth/athmosphere interface. During coming decades, excess radiation income sensible heat...
Differences in mean annual air temperature between the Younger Dryas period and today were estimated at fronts of 32 relict rockglaciers Err-Julier area, eastern Swiss Alps. The analyses based on a case-by-case calculation direct incoming solar radiation using digital elevation model (DEM) meteo data recent years. Our results suggest that during was lowered by c. 3C to 4C, lower limit permafrost occurrence depressed considerably more than glacier equilibrium lines. This indicates strongly...
Abstract The thermal regime of high-altitude accumulation areas in the Swiss Alps was systematically investigated on Jungfraufirn, Bernese Alps, Breithornplateau, Valais and Grenzgletscher, Alps. In 1991, 1992 1994, temperatures were measured a deep hole (120 m deep) several shallow holes (14–30 deep). Whereas wide névé Jungfraufirn at 3400–3600 a.s.l. 3800 high Breithornplateau seems to be predominantly temperate, cold firn ice throughout Grenzgletscher (3900–4450 a.s.l.). Mean vary...
Using ultrahigh-vacuum and mass-spectroscopic techniques, permeation, diffusion, solution of nitrogen in W Mo have been measured for pressures between 5 × 10−5 500 torr temperatures 1100° 2500°K. The following values the permeation constants, P(torr·liter/cm·sec·torr1/2), diffusion D (cm2/sec), solubility S(torr·liter/cm3·torr1/2), are obtained: P(W) = 1.6 10−4exp (− 52 000 / RT); P(Mo) 6.1 10−3exp 47 D(W) 5.4 exp 62 D(Mo) 2.3 10−2exp 33 S(W) 3.0 10−5exp (+ 10 S(Mo) 2.6 10−1exp 14 500/RT)....
Abstract. On 26 June 2008, a rock avalanche detached in the northeast facing slope of Polvartinden, high-alpine mountain Signaldalen, northern Norway. Here, we report on observed and modelled past present near-surface temperature regime close to failure zone, as well subsequent simulation subsurface regime, initial geomechanical mapping based laser scanning. The volume was estimated be approximately 500 000 m3. depth actual surface found range from 40 m at back zone 0 its toe. Visible situ...
Abstract. Ongoing global warming intensifies the degradation of permafrost. Permafrost thawing impacts landform evolution, reduces freshwater resources, enhances potential natural hazards and thus has significant socio-economic impacts. Electrical resistivity tomography (ERT) been widely used to map ice-containing permafrost by its contrast compared surrounding unfrozen medium. This study aims reveal effects ongoing climate on mountain repeating historical ERT analyzing temporal changes in...
This work addresses the complex challenge of forecasting Time Failure (ToF) for tailings dam and a heap leach facility using Satellite InSAR data. These structures can be susceptible to sudden instabilities due contractive brittle behavior tailings, constant remodeling in mining areas introduce bias data retrieval from satellites. Moreover, these are seldom monitored cost-effective coverage satellite useful tool deploy. We developed probabilistic multi-model approach forecast ToF...
The distribution of mountain permafrost in the northern hemisphere depends on topographic and climatic factors, ranging from maritime conditions Iceland over transitional southern Norway to continental Mongolia, alpine mountains paleic mountains. This study discusses different environmental factors that govern based personal studies a literature review. It is hypothesized thermal state ground an important parameter understand time spatial scale sediment transfer landscape development cold...
Abstract. Ongoing global warming intensifies the degradation of mountainous permafrost. Permafrost thawing impacts landform evolution, reduces fresh water resources, enhances potential natural hazards, and thus has significant socio-economic impact. Electrical resistivity tomography (ERT) been widely used to map ice-containing permafrost by its contrast compared surrounding non-frozen medium. This study aims reveal effects ongoing climate on alpine repeating historical ERT analysing temporal...
Abstract Long-term ice-core records of Alpine glaciers are usually taken from cold-firn areas at high altitudes, as on Mont Blanc and Monte Rosa. Perennial ice bodies lower however, also bear information about the past. Recent findings remains such (the Oetztal iceman found in Austria; wooden bows Lötschen Pass, Switzerland) clearly indicate hitherto little-recognized fact that small, more-or-less static perennial which cold frozen to underlying bedrock may contain very old and, hence,...