Blar i NGI articles på forfatter "Bakkehøi, Steinar"

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    • Avalanche risk along a 420 kV transmission line in Iceland 

      Jonsson, Arni; Bakkehøi, Steinar; Hauksson, Sigurjon (Chapter, 2008)
      Two transmission lines between Flj6tsdalur and Reyöarfjöröur in northeast Iceland have been investigated conceming snow avalanche hazard. As a basis for the calculations of the return periods of the avalanches, weather and ...

    • Avalanche risk along a 420 kv transmission line in Iceland. 

      Jónsson, Árni; Bakkehøi, Steinar; Hauksson, Sigurjón (The International Snow Science Workshop (ISSW) Proceedings;, Chapter, 2006)
      Two transmission lines between Fljótsdalur and Reyðarfjörður in northeast Iceland have been investigated concerning snow avalanche hazard. Given a specific level of probability of failure for both the lines less than ...

    • Avalanche run-out on counter-slopes 

      Moe, Arne; Bakkehøi, Steinar; Wieshofer, Sigrid; Domaas, Ulrik (Journal article, 2003)
      Counter-slopes in avalanche paths influence avalanche flow in similarways as defence structures. Measurements and calculations of run-outon such slopes will improve our understanding of retaining damdesign. We have studied ...

    • Calculation of snow avalanche runout distance. 

      Bakkehøi, Steinar; Domaas, Ulrik; Lied, Karstein (Journal article, 1983)
      Evaluation of the maximum runout distance of snow avalanches is one of the most important problems in avalanche zoning. It is also one of the most difficult and controversial subjects in avalanche research. This is especially ...

    • Can we learn more from the data underlying the statistical a-ß model with respect to the dynamical behavior of avalanches? 

      Gauer, Peter; Kronholm, Kalle; Lied, Karstein; Kristensen, Krister; Bakkehøi, Steinar (Journal article, 2010)
      Hazard and risk assessment in avalanche-prone areas involves estimation of runout distances of potential avalanches. Methods for determination of the runout may be divided into two categories: 1) methods based on statistical ...

    • Climate database for avalanche consulting and warning in Norway 

      Jaedicke, Christian; Bakkehøi, Steinar (Journal article, 2007)
      Climate data is an essential tool for the study of weather induced geophysical processes like avalanches. Climate data provides on overview of normal and extreme weather conditions at a given location. This information can ...

    • Comparing topographical and dynamical runout models by ideas of nearest neighbour method 

      Bakkehøi, Steinar; Norem, Harald (Journal article, 1999)
      Different avalanche runout models are used to compare the calculated results against observations of 230 real avalanches in Norway. The parameters used in the models are investigated and optimized to get the best fit to ...

    • The differentiation of thaws in connection with slushflow occurrences. 

      Chernouss, Pavel; Tyapkina, Olga; Hestnes, Erik; Bakkehøi, Steinar (NGI Publication;203, Chapter, 1998)
      Classification of meteorological conditions accompanying slushflow occurrences is attempted. Days with mean daily air temperature above O°C have been chosen for the analysis. Each day has been described with a set of ...

    • Empirical Calculations of Snow–Avalanche Run–out Distance Based on Topographic Parameters 

      Lied, Karstein; Bakkehøi, Steinar (Journal article, 1980)
      A method for calculation of “maximum” avalanche run–out distance based on topographic parameters only is described. 423 well–known avalanches have had their maximum extent registered. The average gradient of avalanche path ...

    • Estimating run-out distances for extreme snow avalanches 

      Norem, Harald; Bakkehøi, Steinar (Lecture, 1992)
      Lecture presented at the Universitè Européenne d'Eté. Neige et Avalanches, Chamonix 1992. Estimating the run-out distances for snow avalanches is an important task for land use planning in mountaneous areas. The practical ...

    • Fonnbu, a new (old) platform for snow and avalanche research. 

      Jaedicke, Christian; Kristensen, Krister; Lied, Karstein; Bakkehøi, Steinar (The International Snow Science Workshop (ISSW) Proceedings;, Chapter, 2008)
      One of the first tasks of the newly established avalanche group at the NGI in 1973 was the selection of a suitable location for an avalanche research station. The choice was on Grasdalen, north of the Jotunheimen mountains, ...

    • Forecasting the fatal Longyearbyen avalanche. Possibilities and challenges 

      Jaedicke, Christian; Hestnes, Erik; Bakkehøi, Steinar; Mørk, Torgeir; Brattlien, Kjetil (The International Snow Science Workshop (ISSW) Proceedings;, Chapter, 2016)
      One of the main questions after the fatal avalanche in Longyearbyen in December 2015, where two persons perished and eleven houses were destroyed, was whether an active avalanche warning system would have identified the ...

    • GIS aided avalanche warning in Norway. 

      Jaedicke, Christian; Kronholm, Kalle; Kristensen, Krister; Bakkehøi, Steinar (The International Snow Science Workshop (ISSW) Proceedings;, Chapter, 2008)
      By 2008 detailed avalanche warning for the entire Norway is not available. The Norwegian Meteorological Institute only issues a general warning for large regions of the country for danger level 4 or 5, mainly based on ...

    • Global warning reduces the consequences of slushflows 

      Hestnes, Erik; Bakkehøi, Steinar; Jaedicke, Christian (Chapter, 2017)
      Most recentpublicationson natural hazards, if they mention slushflows at all, state that their impact onmankind will increase. However, milder weather, shorter winters, less snow and rise of the snowline will mainly shift ...

    • Longyearbyen, Svalbard - Vulnerability and risk management of an arctic settlement under changing climate - a challenge to authorities and experts 

      Hestnes, Erik; Bakkehøi, Steinar; Jaedicke, Christian (The International Snow Science Workshop (ISSW) Proceedings;, Chapter, 2016)
      Longyearbyen, the administrative centre of the Svalbard archipelago, is facing most types of natural hazards under a changing Arctic climate. The catastrophic avalanche in December 2015 led NGI to review our professional ...

    • Observations on water level fluctuations in snow due to rain and snowmelt 

      Hestnes, Erik; Bakkehøi, Steinar (Chapter, 1996)
      Meteorological parameters, snowpack conditions and water level fluctuations in snowpack due to rain and snowmelt, have been registered during 5 winters at two slushflow sites in Rana, North Norway. A noticeable rise of ...

    • On the computation of parameters that model snow avalanche motion 

      Bakkehøi, Steinar; Cheng, T.; Domaas, Ulrik; Lied, K.; Perla, R.; Schieldrop, B. (Journal article, 1981)
      This paper explores the computational problem of finding suitable numbers to use in a twoparameter model of snow avalanche dynamics. The two parameters are friction, y, and a ratio of avalanche mass to drag, MID. Given a ...

    • Prediction of slushflow hazard based on data from local meteorological stations. 

      Bakkehøi, Steinar; Hestnes, Erik (The International Snow Science Workshop (ISSW) Proceedings;, Chapter, 2010)
      Seeking objective criteria for slushflow prediction and warning, meteorological data has been recorded at two slushflow sites in Rana District, North Norway, during a 10 years period. The two starting zones were equipped ...

    • Regional avalanche warning in Norway, a new concept for a large country 

      Jaedicke, Christian; Bakkehøi, Steinar; Sandersen, Frode; Brattlien, Kjetil; Solheim, Anders (The International Snow Science Workshop (ISSW) Proceedings;, Chapter, 2008)
      Norway encompasses 324 000 km2 of land area of which ca. 7 % are mountainsides steeper than 30 degrees. The country extends approximately 1700 km from south to north and features extreme variations in normal precipitation ...

    • Sikringsmetoder mot snøskred 

      Bakkehøi, Steinar (Chapter, 1979)
      I store deler av landet vårt har vi omrader vi ønsker å utbygge, men hvor det samtidig er mulighet for snøskred. I de fIeste tilfellene der man er klar over snøskredfaren, unnlater man a føre opp bygninger. Der det allerede ...