Browsing Norges Geotekniske Institutt by Subject "Avalanche-RnD"
Now showing items 361-380 of 382
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The upgraded full-scale avalanche test-site Ryggfonn, Norway.
(The International Snow Science Workshop (ISSW) Proceedings;, Chapter, 2010)Measurements of full-scale avalanches are expensive and time consuming, but are indispensable to gain in-depth understanding of the flow behavior of avalanches. They are needed to crosscheck the scaling used in small-scale ... -
The use of a numerical snow-drift model as a decision making tool in the planning of avalanche protection measures.
(The International Snow Science Workshop (ISSW) Proceedings;, Chapter, 2002)Blowing and' drifting snow is not only a major factor in the assessment of the acute avalanche danger, its contribution to the snow distribution also influences land-use planning. In many parts of alpine terrain end an ... -
The use of commercial cad software in snow avalanche run-out estimation
(The International Snow Science Workshop (ISSW) Proceedings;, Chapter, 2012)Linear infrastructures like highways and transmission lines often pass avalanche terrain both in remote and urban areas. In some cases these areas are quite wide, measured along the lines, and the number of avalanche paths ... -
Use of Daisybell and Snow Profiles to Investigate the Effect of Alpine Birch on Avalanche Release
(The International Snow Science Workshop (ISSW) Proceedings;, Chapter, 2014)Through a field study in Abisko, northern Sweden, we have used the artificial avalanche release system DaisyBell together with snow profiles to study the effect of alpine birch forest on avalanche formation. Evergreen ... -
Using eCognition Definiens for automated detection of snow avalanche deposits from very high resolution optical imagery - New developments
(NGI-rapport;20120096-01-TN, Research report, 2013-01-28)The identification of snow avalanche deposits from high resolution optical satellite imagery had been the focus of the project "avalRS” which NGI, together with the Norwegian Computing Centre and Statens Veivesen, had ... -
Using eCognition Definiens for automated detection of snow avalanches from optical imagery
(NGI-rapport;20110112 Notat 2012-07-14 Rev. 1, Research report, 2012-07-14)Detection of avalanches from remotely collected optical imagery has been tested through analysis of image properties such as brightness, contrast, and different measures of texture. There have been few publications on ... -
Using eCognition to automatically detect and map avalanche deposits from the spring 2009 avalanche cycle in the Tatra Mts., Slovakia
(Journal article, 2015)Here we present results from ongoing work where we apply an object oriented mapping algorithm developed in eCognition in order to automatically identify and digitally map avalanche deposits. The algorithm performance is ... -
Using of GIS technology for avalanche hazard mapping, scale 1:10 000
(NGI Publication;203, Chapter, 1998)The sites with the size of 50·50 m2 having a various probability of avalanche formation were revealed for a given territory covering an area of 3·4 km2. Crossclassification of sites considering their slopes and snow cover ... -
Utviklingstrekk og muligheter for sikring av veger mot snøskred
(Journal article, 1984)Snøutvalget i Statens Vegvesen var i virksomhet i perioden 1974- 82. Hovedformålet til utvalget var å følge med i snøprosjekter ved NTH, initiere forsøk med sikring av veger mot. snøskred og drivsnø, og sørge for at ... -
Verification of avalanche bulletins by questionnaires
(NGI Publication;203, Chapter, 1998)The paper describes how avalanche bulletins (regional and national) are being verified by means of questionnaires in Switzerland. At the beginning of winter 1996/97 a set of four questionnaires has been introduced: • ... -
Vulnerability of houses and persons under avalanche impact – the avalanche at Longyearbyen on 2015-12-19
(The International Snow Science Workshop (ISSW) Proceedings;, Chapter, 2016)This study uses data from the avalanche that killed two persons and destroyed eleven essentially identical wood-frame houses in Longyearbyen, Svalbard, on 2015-12-19. The avalanche is back-calculated with a dynamical model ... -
Vær- og snøforhold samt skredsituasjoner vinterene 1974-75, 1975-76, 1976-77, 1977-78, 1978-79. Grasdalen, Stryn
(NGI-rapport;58000-03, Research report, 1985-12-27)En beskrivelse av værforholdene ved Garasdalen for vintersesongene fra desember 1974 til april 1979 er presentert i denne rapporten. En oversikt over skredaktiviteten i den samme perioden er også gitt. -
Vær-, snø- og skredobservasjoner i Grasdalen. En sammenfatning
(NGI-rapport;58110 R, Research report, 1983-09-29)Observasjonene i Grasdalen gjøres på en mest mulig standardisert måte. Metodikken for værobservasjonene er henta fra Meteorologisk Institutts "Håndbok for meteorologiske observatører 1" og "Meteorologiske koder, synop". ... -
Weather and snowpack conditions essential to slushflow release and downslope propagation
(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. ... -
Weather stations in Norway suitable for SNOWPACK modelling in Norway in 2016
(NGI-rapport;20140053-04-TN, Research report, 2017-01-23)A physical SNOWPACK model developed by Swiss Federal Institute for Snow and Avalanche Research, SLF, requires following meteorological observations as input data1 for the model simulations: - air temperature (TA) - ... -
Wind simulations for use in local avalanche forecasting
(NGI-rapport;20170131-19-TN, Research report, 2020-06-26)Quantification of release probabilities in local avalanche forecasting are depending on knowledge of historical weather characteristics as well as detailed knowledge of the wind driven snow distribution on a fine scale. ... -
Wind-tunnel study of snowdrift around avalanche defence structures
(Journal article, 2004)Avalanche defence structures such as retarding dams and breaking mounds are widely used to protect residential areas and other kinds of infrastructure. The effect of the defence structures depends largely on their effective ... -
WP 2 – Full-scale experiments at Ryggfonn Ryggfonn avalanche observations 2019/2020
(NGI-Rapport;20200017-05-TN, Research report, 2021-03-22)NGI is operating the avalanche test site at Ryggfonn in Stryn municipality, Vestland county, western Norway (61.969°N, 7.275°E) since early 1980s. In addition to the field work and data collection in frame work of WP2, ... -
WP 2 – Full-scale experiments at Ryggfonn Ryggfonn avalanche observations 2020/2021
(NGI-rapport;20200017-06-TN, Research report, 2022-04-07)NGI continues to operate the avalanche test site at Ryggfonn in Stryn municipality, Vestland county, western Norway (61.969°N, 7.275°E). In addition to the field work and data collection performed in the context of WP2 – ... -
WP 2 – Full-scale experiments at Ryggfonn Ryggfonn avalanche observations 2021/2022
(NGI-Rapport;20200017-11-TN, Research report, 2024-01-03)NGI is operating the avalanche test site at Ryggfonn in Stryn municipality, Vestland county, western Norway (61.969°N, 7.275°E) since the early 1980s. In addition to the field work and data collection in the framework of ...