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Ryggfonn - Options for reconstruction of the test site. Deliverable of the NFR-Snow research programme SIP-6
(NGI-rapport;58120-34, Research report, 2001-01-31)Norges Forskningsråd (NFR) -
The Ryggfonn 5m digital terrain model
(NGI-rapport;20110116-00-1-TN, Research report, 2011-04-12)This document describes how the 5m digital terrain model (DTM) for Ryggfonn has been made and how the data is formatted. -
The Ryggfonn project. Avalanche data from the winters 1994/95 and 1995/96
(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 ... -
The Ryggfonn project. Avalanche data from the winters 1996/97, 1997/1998, 1998/1999 and 1999/2000
(NGI-rapport;58120-33, Research report, 2001-11-01)This report presents data collected from the full-scale Ryggfonn project during the winters 1996/1997, 1997/1998, 1998/1999 and 1999/2000. The weather and snow conditions and avalanches characteristics are summarised. The ... -
The Ryggfonn project. Description of instrumentation and data registration system
(NGI-rapport;58120-03, Research report, 1983-06-10)The Ryggfonn avalanche path has been instrumented to measure: deflections on a 6 m high steel mast mounted at top of the test embankment by means of weldable strain gauges; wind speed of powder snow fronts by means of a ... -
Ryggfonn prosjektet. Målinger gjort under skred 23. april 1983
(NGI-rapport;58120 Notat 1983-06-27, Research report, 1983-06-27) -
Sentrifuge til bestemmelse av strekkfasthet i snø
(NGI-rapport;58101-01, Research report, 1974-01-01)På snøforskningsstasjonen i Grasdalen var det behov for laboratorieutstyr til utforskning av snøens mekaniske egenskaper. Efter en studietur som undertegnede foretok til Snøforsknings instituttet på Weissfluhjoch ovenfor ... -
Shear stresses and boundary layers in snow avalanches
(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 ... -
A Simple Model for the Variability of Release Area Size
(NGI-Rapport;20200017‐03‐TN, Research report, 2023-08-24)The hazard mapping tool NAKSIN estimates the release probability of potential release areas (PRAs) by testing a stability criterion based on the infinite-slope approximation with a large sample of synthetic weather situations. ... -
Simulations of dense snow avalanches on deflecting dams
(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 ... -
SIP-6 snøskredforskning. Bruk av klimadatabaser for skredfareevaluering
(NGI-rapport;58810-23, Research report, 2002-01-29)Det er innhenta værdata fra 15 meteorologiske klimastasjoner i Norge. Disse dataene er behandla slik at de er relevante for vurdering av sannsynligheten for utløsning av snøskred. Det betyr at det er foretatt en glidende ... -
SIP6 snøskredforskning. Vær-, snø - og snøskred i Grasdalen. Vintrene 1994/1995 til 1999/2000
(NGI-rapport;20011001-05, Research report, 2001-10-29)Denne rapporten gir en oversikt over innsamlede vær-, snø- og snøskreddata fra skredforskningsstasjonen Fonnbu i Grasdalen på Strynefjellet. Oversikten omfatter vintrene 1994/1995, 1995/1996, 1996/1997, 1997/1998, 1999/2000. -
SIP8 - offshore geohazards and SIP6 - snøskredforskning. 3D- visualization of slides and the NIS slide model
(NGI-rapport;20021023-36, Research report, 2005-03-31)Numerical models are important tools for hazard assessment, and visualization is an important tool for pre-processing the input to those models and presenting results from the model runs. Visualization results address ... -
Skred, skråninger. Generelt. Thermodynamic equilibrium between ice and water in porous media
(NGI-rapport;50900-01, Research report, 1977-01-01)A derivation is given for the equation of thermodynamic equilibrium between ice and water in porous media. The equation accounts for a difference between the pressure of the ice phase and the total potential (in pressure ... -
Skred- og klimadatabase. Statusrapport. Skreddatabase
(NGI-rapport;20041046 Notat 2005-01-07, Research report, 2005-01-07)Avdeling for skred og ingeniørgeologi ønsker gjennom prosjektet 20041046 å utvikle en database for lagring av skredinformasjon, samt et webbasert grensesnitt for registrering av skredinformasjon. Arbeid i prosjektet er ... -
Skredsøk ved bruk av magnetometer
(Research report, 2003)En innledende teoretisk analyse viser at den beste metoden for å detektere begravde ferromagnetiske gjenstander er ved å bruke to magnetometre montert i en fast avstand og å bruke forskjellen i måleverdi (gradienten) som ... -
Skredulykken under Håbergnuten, Svalbard
(NGI-rapport;58810-21, Research report, 2001-08-31)To menn som var ute og kjørte snøscootere ble tatt av et snøskred som løsnet i fjellsida opp mot fjellet Håbergnuten sør for Dryabreen i Fardalen ca. kl. 15:30 Søndag 4. februar 200 I. Skredet løsnet etter forutgaende ... -
Skredutløsning. Installasjonsrapport
(NGI-rapport;84425 Notat 1984-10-12, Research report, 1984)I uke 38/84 ble de koblingsbokser og forbindelses kabler som er beskrevet i rapport 84425 (se vedlegg 1) lagt ut og koblet sammen ute i terrenget (fjellsiden). Alle koblingsboksene og ledningene ble gravd ned i lyng og ... -
Slushflow questionnaire
(NGI-rapport;58200-06, Research report, 1988-10-10)Questionnaires concerning slushflows were distributed globally. The purpose of the questionnaire was to determine the geographic distribution of slushflow activity as well as to collect information concerning most common ... -
Snow avalanche damages in Norway 1981/82
(NGI-rapport;58810-03, Research report, 1982-05-07)The Avalanche Section at the Norwegian Geotechnical Institute after each winter compiles a survey of accidents and damage caused by snow avalanches. Serious accidents are investigated by NGI and reports are published in ...