Browsing Norwegian Geotechnical Institute (NGI) Digital Archive by Issue Date

Now showing items 81-100 of 1228

    • Comparing model and full-scale experiments on snow avalanche dynamics 

      Norem, Harald (NGI-rapport;58120-28, Research report, 1992-10-01)
      The paper is a part of a Japanese - Norwegian collaboration on snow avalanche dynamics. The results of model experiments carried out at the Institute of Low Temperature Science, Sapporo are compared with full-scale ...

    • Observations of the dynamic structure of snow avalanches 

      Nishimura, K.; Maeno, N.; Kristensen, Krister; Sandersen, Frode; Norem, Harald; Lied, Karstein (Journal article, 1993)
      During two winters, 1990–92, the dynamic structures of snow avalanches were studied in western Norway. Artificially released wet-snow avalanches ran down the avalanche chute and stopped in front of the retaining dam. Running ...

    • Pelefundamentering av kraftmaster og snøskredforbygninger i skrått terreng - Sluttrapport 

      Lied, Karstein (Research report, 1993-02-03)
      Prosjektet har gått ut på å undersøke muligheten av bruk av peler for å fundamentere snøskredforbygninger, kraftmaster oglignende konstruksjoner på løsmasser i bratt terreng. Siktemålet har først og fremst vært å gjennomføre ...

    • Activities of the Japanese-Norwegian collaboration of snow avalanche research during the winters 1990/1991 and 1991/1992. Final report 

      Bakkehøi, Steinar; Kristensen, Krister; Nishimur, Koichi; Norem, Harald; Sandersen, Frode (NGI-rapport;58120-29, Research report, 1993-03-05)
      The report gives a brief summary of the activities carried out by the Japanese - Norwegian collaboration on snow avalanche reasearch during the winters of 1990/1991 and 1991/1992. The research was mainly carried out in the ...

    • An avalanche forecasting program based on a modified nearest neighbour method. 

      Kristensen, Krister; Larsson, Christer (The International Snow Science Workshop (ISSW) Proceedings;, Chapter, 1994)
      As a part of an avalanche forecasting system, a modified nearest neighbour program is described. The system is intended to be used with forecast values for most ofthe parameters. The modifications consist of 1) the use of ...

    • Weather and snowpack conditions essential to slushflow release and downslope propagation 

      Hestnes, Erik; Bakkehøi, Steinar; Sandersen, Frode (The International Snow Science Workshop (ISSW) Proceedings;, Chapter, 1994)
      Rapid mass movement of water-saturated snow, usually known as slushflow or slush avalanche, is a major natural hazard in Norway. Slushflows occur in winter during heavy rainfall, as well as due to intense thaw in spring. ...

    • Avalanche control measures for roads in Norway 

      Larsen, Jan Otto (Chapter, 1994)
      In a mountainous country like Norway the roads are exposed to different kind of natural hazards. Increasing traffic and extensive road-building programs the latest 25 years have made the society dependent on a relatively ...

    • Sikringstiltak mot snø- og sørpeskred 

      Hestnes, Erik; Sandersen, Frode (Byggforskserien - Planløsning;Sending 1, Chapter, 1995)
      Dette bladet behandler de vanligste tiltakene for å sikre bebyggelse mot snø- og sørpeskred. Hensikten med bladet er å gi en oversikt over mulige sikringsmetoder. Bladet gir ikke detaljerte data for prosjektering og ...

    • Shear stresses and boundary layers in snow avalanches 

      Norem, Harald (NGI-rapport;581240-03, Research report, 1995-10-20)
      Full-scale experiments on snow avalanches have shown that the major part ofthe avalanches are mixed flow avalanches, and that they consist of at least two parts, a dense flow part and a turbidity part. The report is based ...

    • 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 ...

    • Norsk-islandsk samarbeid om snøskred 

      Nordal, Anne Grete (Journal article, 1996)
      Bade Norge og Island har boligområder som er svært skredutsatt om vinteren. Noen ganger får skredene katastrofale følger. I januar 1995 gikk det et stort snøskred pa tettstedet Sudavik på Island. 15 mennesker omkom. I ...

    • An overview of the need for avalanche protection measures in Iceland 

      Johannesson, Tomas; Lied, Karstein; Margreth, Stefan; Sandersen, Frode (Iceland. Ministry for the Environment;VI-R96004-UR03, Report, 1996)
      The present report is prepared by the Icelandic Meteorological Office for the Icelandic Ministry for thc Environment and Iocal authorities in towns threatened by avalanches....

    • The effect of dam constructions as mitigative measures: 14 years of experience from a full-scale project 

      Larsen, Jan Otto; Norem, Harald (Lecture, 1996)
      The Ryggfonn project is a full-scale project for determination of avalanche behavior. Measurements of velocities, impact pressures and observations of flow patterns around a 15 m high and 75 m long earthfill dam, have been ...

    • Snow avalanche forecasting in Iceland and Norway 

      Kristensen, Krister (NGI-rapport;581250-02, Research report, 1996-01-29)
      This document describes local avalanche warning and forecasting operations in Iceland and Norway, with the focus on forecasting as a preventive measure for communities with threatened habitations. The objective of an ...

    • Computational models for dense snow avalanche motion 

      Harbitz, Carl Bonnevie (NGI-rapport;581250-03, Research report, 1996-04-30)
      Seventeen various models of dense snow avalanche motion are presented. These include statistical, comparative and energy considering models for runout distance computations as well as dynamic models for avalanche motion ...

    • Simulations of dense snow avalanches on deflecting dams 

      Irgens, Fridtjov (NGI-rapport;58121-03, Research report, 1997-08-27)
      Two models simulating snow avalanches impacting retaining dams at oblique angles of incidence are presented. First a lumped mass model applying the Voellmy-Perla equation is used to calculate the path ofthe centre-of-mass ...

    • TIGRA. The integrated geological risk assessment. Hazard zoning methods of snow avalanches, debris flow and rock falls. Final report 

      Lied, Karstein (NGI-rapport;589210-03, Research report, 1997-11-20)
      The present report describes natural hazard zoning methods for snow avalanches in Norway and in some other countries were avalanches are a serious threat to the society. In addition methods for rock-fall and debris slide ...

    • The Ryggfonn project. Avalanche data from the winters 1994/95 and 1995/96 

      Kristensen, Krister (NGI-rapport;58120-32, Research report, 1997-12-20)
      This report presents data collected from the full-scale Ryggfonn project during the winters 1994/95 and 1995/95. Only four avalanches were observed in the course of these two winters, three of which were naturally released ...

    • Conclusions from a recent survey of avalanche computational models 

      Harbitz, Carl Bonnevie; Issler, Dieter; Keylock, Christopher J. (NGI Publication;203, Chapter, 1998)
      In this paper we summarise a survey report on computational models for snow avalanche motion that was developed within the frame-work of the EU research project SAME (Snow Avalanche Modelling, Mapping and Warning in Europe). ...

    • Simulations of dense snow avalanches on deflecting dams 

      Irgens, Fridtjov; Schieldrop, Bonsak; Harbitz, Carl Bonnevie; Domaas, Ulrik; Opsahl, Runar (Journal article, 1998)
      Two models simulating snow avalanches impacting retaining dams at oblique angles of incidence are presented. First, a lumped-mass model applying the Voellmy-Perla equation is used to calculate the path of the centre-of-mass ...