Blar i NGI articles på utgivelsesdato
Viser treff 21-40 av 1026
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Kartlegging av snøskred- og steinsprangfare ved hjelp av EDB-baserte metoder
(Chapter, 1984)For å unngå at boligfelt planlegges i skredfarlig tcrreng er det satt igang kartlegging av områder utsatt for snøskred-og steinsprangfare i Norge. Kartleggingen er basert på topografiske kart og i målestokk l: 15 000. Disse ... -
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 ... -
Comparison of snow pressure measurements and theoretical predictions
(Journal article, 1984)Measurements of snow creep pressures from the centre section of a 3.4 m high and 15 m long avalanche-defence supporting structure located on a mountain in western Norway are presented. The site has a deep snow cover and ... -
Measurement of avalanche speeds and forces: instrumentation and preliminary results of the Ryggfonn project.
(Journal article, 1985)The Ryggfonn project is a Full scale experiment carried out to investigate the impact of avalanches on structures and the effects of a retaining dam in the avalanche path. The vertical drop of the avalanche path is 910 m ... -
A contribution to the prediction of slush avalanches
(Chapter, 1985)Slush avalanches, primarily known from uninhabited arctic and mountainous regions, every year cause damage to man and property in Norway. Seeking objective criteria to identify their hazard zones, and methods for their ... -
Design criteria and location of snow fences
(Journal article, 1985)The paper describes experience gained in Norway regarding the design criteria and use in practice of snow fences . The paper is based on theoretical studies on drifting snow, model experiments and experience accumulated ... -
The temporal and spatial variation of snow pressure on structures
(Journal article, 1985)Measurements of snow creep pressure on an avalanche-defence structure in western Norway are presented. Two different types of measurement methods are described and evaluated. Pressure data from four winters are correlated ... -
A synoptic climatology of major avalanche winters in Norway
(Journal article, 1986)A near continuous record of avalanche deaths in Norway is compiled for 130 years from 1855, and shows a distinct downward trend, but large variations from winter to winter, with a periodicity of 12–13 years. Twelve major ... -
Statistical and geometrical definition of snow avalanche runout
(Journal article, 1987)Two mathematical models for calculating the extreme avalanche runout from a fixed reference point on the path are presented and contrasted. The models are: (1) estimates of confidence limits on regression analyses of ... -
The avalanche accident at Vassdalen, Norway, 5th March 1986
(Journal article, 1988)Shortly after 1300 hrs on wednesday March 5, 1986, a snow avalanche released from Storebalak, a mountain located at Vassdalen in Nordland county. The avalanche struck 31 men from the North Norway Brigade while they were ... -
Simulation of snow-avalanche flow in run-out zones.
(Journal article, 1989)The authors of this paper have previously, in 1987, outlined the development of a set of constitutive equations representing the behaviour of avalanching snow, and the resulting equations for fully developed steady shear ... -
Slush-flow questionnaire.
(Journal article, 1989)Questionnaires concerning slush flows were distributed globally. The purpose of the questionnaire was to determine the geographic distribution of slush-flow activity and also to collect information concerning the most ... -
Calculation of maximum snow-avalanche run-out distance by use of digital terrain models.
(Journal article, 1989)This paper discusses how maximum snow-avalanche run-out distance may be calculated by a combination of topographic parameters and use of a digital terrain model. Digitized maps are being made for extensive areas of Norway. ... -
Snow-creep pressure on masts
(Journal article, 1989)Snow-pressure measurements have been carried out on two masts at the NGI avalanche station in Grasdalen, western Norway. These two tubular masts have diameters of 0.22 and 0.42 m, respectively, and are situated on a 25° ... -
Snow creep pressure on mast constructions
(The International Snow Science Workshop (ISSW) Proceedings;, Chapter, 1990)In Norway snow-creep quite often causes damage on mast constructions on hillsides exposed to deep snow-cover. An extensive snow-creep measurement program has therefore been carried out for different constructions at NGI's ... -
Norwegian demands on avalanche safety - legislation, quality policy and judicial practice
(Lecture, 1991)The Building and Planning Act and the Working Environment Act both have demands concerning avalanche safety. The legal demands concerning avalanche safety were first established in the Building Act of 1924. The act was put ... -
Estimating run-out distances for extreme snow avalanches
(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 ... -
Observations of the dynamic structure of snow avalanches
(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 ... -
An avalanche forecasting program based on a modified nearest neighbour method.
(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
(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. ...