Blar i NGI articles på utgivelsesdato

Viser treff 41-60 av 1027

    • 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 ...

    • 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 ...

    • 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 ...

    • Slushflow hazard - where, why and when? 25 years of experience with slushflow consulting and research. 

      Hestnes, Erik (Journal article, 1998)
      Slushflows — flowing mixtures of water and snow — are a major natural hazard in Norway. Knowledge gathered by the Norwegian Geotechnical Institute during 25 years of slushflow consulting and research is presented. The ...

    • Quantitative risk analysis for evaluation of avalanche protection projects 

      Wilhelm, Christian (NGI Publication;203, Chapter, 1998)
      Questions on optimum protection measures have always been bound to economic considerations. This involves a comprehensive investigation and analysis of the effect of avalanche protection measures with an appropriate concept ...

    • Rock-avalanche hazard in Møre & Romsdal, western Norway 

      Einar, Ansa; Blikra, Lars Harald (NGI Publication;203, Chapter, 1998)
      Flood waves generated by large rock avalanches have caused major disasters in Norway. Many of these events are restricted to a relatively limited zone in the counties Møre & Romsdal and Sogn & Fjordane. Geological studies ...

    • Safran/Crocus/Mepra models as an helping tool for avalanche forecasters 

      Giraud, G.; Brun, E.; Durand, Y.; Martin, E. (NGI Publication;203, Chapter, 1998)
      To describe the great variability of the snow pack and to predict the avalanche risk in the French Alps and Pyrenees massifs, the «Centre d'Etudes de la Neige» (C.E.N.) of METEO-FRANCE has developed an automatic chain of ...

    • A short comparison between Voellmy-fluid and Criminale-Ericksen-Filby-fluid dense snow avalanche models 

      Bartelt, Perry; Salm, Bruno (NGI Publication;203, Chapter, 1998)
      In the publications Norem et al. (1987) and Norem et al. (1989) a dense snow avalanche model is proposed that uses a Criminale-Ericksen-Filby constitutive relation with power law viscosity functions. A vertical velocity ...

    • An overview of avalanche forecasting models and methods 

      Föhn, Paul M.B. (NGI Publication;203, Chapter, 1998)
      This overview resumes first the historical development of avalanche forecasting in different countries of the world. It yields the most basic definitions like "avalanche danger" and presents the major problems of avalanche ...

    • Operational use of a snowpack model for the avalanche warning service in Switzerland : model development and first experiences 

      Lehning, Michael; Bartelt, Perry; Brown, Bob (NGI Publication;203, Chapter, 1998)
      The national Swiss avalanche warning service must provide high quality avalanche danger forecasts with an increasing spatial resolution. For this purpose, forecasters require objective tools to judge local and regional ...

    • Opportunity of detailing avalanche forecasts 

      Isaev, A. A. (NGI Publication;203, Chapter, 1998)
      The national Swiss avalanche warning service must provide high quality avalanche danger forecasts with an increasing spatial resolution. For this purpose, forecasters require objective tools to judge local and regional ...

    • An overview of natural hazard zoning with special reference to avalanches 

      Hopf, Josef (NGI Publication;203, Chapter, 1998)
      Natural hazards are increasingly a limiting factor in mountainous countries in connection with the growing population and economical development. People become more and more estranged to environmental conditions and are ...

    • The meteorological condition for larger avalanches at Senjojiki Bowl in Japanese Central Alps 

      Nitta, Ryuzo; Harada, Yusuke (NGI Publication;203, Chapter, 1998)
      The Senjojiki Bowl has a typical avalanche terrain consisting of8 avalanche tracks. During the last 25 years 16 alpinists and ropeway workers in total have been killed by avalanches. Since no reliable avalanche warning is ...

    • Long-term forecasting of changes of snowiness and avalanche activity in the world due to global warming 

      Glazovskaya, T.G.; Seliverstov, Yu. G. (NGI Publication;203, Chapter, 1998)
      The technique of definition of depth of the snow cover, number of days with the snow cover, number of days with intensive snowfalls, duration of avalanche prone period by the standard meteorological data (precipitation and ...

    • The potential of sedimentology and stratigraphy in avalanche-hazard research 

      Blikra, Lars Harald; Thorsteinn, Sæmundson (NGI Publication;203, Chapter, 1998)
      Detailed sedimentology studies in cross sections and studies of recent processes on avalanche-dominated colluvial fans have been combined in order to evaluate the characteristic sedimentary facies of avalanche processes. ...