Norges Geotekniske Institutt: Recent submissions
Now showing items 221-240 of 1234
-
Research Plan 2023–2025
(NGI-Rapport;20230100-01-R, Research report, 2023-05-19)Snow avalanches are a frequent and significant natural hazard in Norway. Each year, avalanche events result in fatalities, evacuations, interruptions, and damage to infrastructure networks such as roads, railways, and ... -
Outline of a Simple Model of Mixed Snow Avalanches
(NGI-Rapport;20200017‐10‐TN, Research report, 2023-08-24)This Note discusses a quasi-three-dimensional model of mixed snow avalanches that could replace the code MoT-Voellmy in NAKSIN. As a starting point, the two-layer model by Eglit is slightly simplified and extended from a ... -
Avalanche observations versus numerical avalanche model: Simple test of model performance
(NGI-Rapport;20200017-04-TN, Research report, 2021-03-22)Hazard assessment for landuse planning in snow avalanche prone areas requires, besides knowledge of return periods, the specification of expected runout distances. For a complete risk assessment, additionally, the intensity ... -
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 – ... -
Annual Report 2019 [SP4 FoU Snøskred]
(NGI-rapport;20170131-17-R, Research report, 2020-05-28)NGI has conducted research on avalanches and related processes since 1973. This report gives a short insight in the work done in 2019. While experiments with artificial release of avalanches in the Ryggfonn experimental ... -
Annual Report 2018 [SP 4 FoU Snøskred]
(NGI-rapport;20170131-11-R, Research report, 2018-12-21)In the second year of the present three-year project period, core and/or long-term activities were continued: -experiments at Ryggfonn and maintenance of the site, -infrasound monitoring along State Road 15 between Fonnbu ... -
Annual Report 2017 [SP 4 FoU Snøskred]
(NGI-rapport;20170131-05-R, Research report, 2018-01-12)During the first year of the project period 2017–2019 of NGI's research project on snow avalanches, work was carried out in all five work packages (WP 1 – Ryggfonn and model development, WP 2 – Statistical tools, WP 3 – ... -
Field Survey of the 2017 Rigopiano Avalanche
(NGI-rapport;20170131-02-TN, Research report, 2019-12-26)In the evening of January 18, 2017, a large snow avalanche descended from the east flank of Monte Siella in the municipality of Farindola in the Abruzzo region of Italy. It completely destroyed the Hotel Rigopiano and ... -
Dynamical Aspects of the 2017 Rigopiano Avalanch
(NGI-rapport;20170131-08-TN, Research report, 2019-01-21)Abstract: Data on the disastrous snow avalanche that occurred on 2017-01-18 at the spa hotel Rigopiano, municipality of Farindola in the Abruzzo region of central Italy, are analyzed in the present Technical Note in different ... -
Estimating Avalanche Triggering Probability using meteorological and local terrain parameters through a fuzzy inference approach
(NGI-rapport;20170131-12-TN, Research report, 2019-04-23)The aim of the present study is the quantitative estimation of snow avalanche triggering probability (ATP) for daily local forecasting purposes based on meteorological and local terrain factors. At present, ATP is indirectly ... -
Snøskyskredmodell SL-1D – Grunnleggende ligninger og korrektur-faktorer
(NGI-rapport;20170131-06-TN, Research report, 2017-12-22)For tiden mangler det en beregningsmodell for snøskyskred som er like raskt og enkelt å bruke som f.eks. modellene RAMMS eller MoT-Voellmy for den tette delen av snøskred. I rådgivningsoppdrag brukes det derfor av og til ... -
Befaringsnotat Grandefonna, Geiranger
(NGI-rapport;20170131-14-TN, Research report, 2020-06-26)Grandefonna i Geiranger gikk 17. januar 2019 etter en periode med stort snøfall (NV-situasjon) og stengte vegen. I løpet av 3-5 dager i midten av januar kom det omkring 70-100 cm snø i området. Det var ikke spesielt mye ... -
Snøskredulykke i Tamokdalen 2019-01-02
(Research report, 2019-05-29)Fire utenlandske skituristerutløste et snøskred på topptur i Tamokdalen. Alle de fire omkom. Notatet beskriver skredfaglige faktorer. -
Time series modelling: applications for groundwater control in urban tunnelling
(Peer reviewed; Journal article, 2023)Water ingress to tunnels may result in pore pressure drawdown and consolidation settlements in areas above tunnels founded on soft soil deposits, potentially causing damage to buildings and infrastructure. To limit pore ... -
Review of meteorological data from Fonnbu 2009–2016
(NGI-rapport;20140053-05-TN, Research report, 2017-01-25)12 observed parameters are recalculated with a time step of 1 hour from the original raw data set of observed values with 10 minute time step. To form winter season data sets which would cover complete snow season, it was ... -
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) - ... -
Notes on the Fluidization of Snow Avalanches by Air Expulsion from the Snow Cover
(NGI-rapport;20140053-03-TN, Research report, 2017-02-03)A recently proposed mechanism for fluidization of the front of dry-snow avalanches, based on air escaping from the snow cover that is compressed under the weight of the avalanche (Issler, 2013) is discussed. -
Simulations of dense snow avalanches on deflecting dams
(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 ... -
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 ... -
Calculation of snow avalanche runout distance.
(Journal article, 1983)Evaluation of the maximum runout distance of snow avalanches is one of the most important problems in avalanche zoning. It is also one of the most difficult and controversial subjects in avalanche research. This is especially ...