Now showing items 178-196 of 196

    • Using eCognition Definiens for automated detection of snow avalanche deposits from very high resolution optical imagery - New developments 

      Lato, Matthew J.; Frauenfelder, Regula (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 

      Lato, Matthew J.; Frauenfelder, Regula (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 hydrogeological numerical modelling to predict drainage to excavations – findings from four Norwegian case studies 

      Kahlström, Mats (NGI-rapport;20170774-D3.4, Research report, 2022-08-30)
      Urban ground work such as deep excavations performed in soft clay may cause damage to neighbouring buildings and structures as a consequence of settlements partly caused by drainage. The costs related to settlement damage ...
    • Verktøy for Risikohåndtering – Manual Norsk 

      Piciullo, Luca; Langford, Jenny (NGI-rapport;20170774-D5.2, Research report, 2019-09-08)
      Hensikten med verktøyet er å systematisk identifisere og vurdere risiko for uønskede hendelser. Risikomatrisen som genereres kan danne grunnlag for valg av anleggsmetoder og behov for avbøtende tiltak. Risikovurderingen ...
    • Vibration induced damage due to construction work – Blasting tests 

      Norén-Cosgriff, Karin (NGI-rapport;20170774-D4.2, Research report, 2021-12-01)
      In this study, two instrumented blast test series were performed in a rock quarry in Norway. For the first test series, two buildings were erected, one made of Light Expanded Clay Aggregate (Leca) blocks, and one in ...
    • Vibration induced damage due to construction work – Effect of vibrations on slope stability 

      Johansson, Jörgen (NGI-rapport;20170774-D4.3, Research report, 2019-08-29)
      A landslide-triggered tsunami caused extensive material damage at Statland, Norway in 2014. Other landslides in Sweden and US have also been triggered by man-made vibrations. To understand better how vibrations from vibratory ...
    • Vær- og snøforhold samt skredsituasjoner vinterene 1974-75, 1975-76, 1976-77, 1977-78, 1978-79. Grasdalen, Stryn 

      Christianditis, Savvas; Bakkehøi, Steinar (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 

      Bakkehøi, Steinar (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 stations in Norway suitable for SNOWPACK modelling in Norway in 2016 

      Ragulina, Galina (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 

      Gisnås, Kjersti (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. ...
    • WP 2 – Full-scale experiments at Ryggfonn Ryggfonn avalanche observations 2019/2020 

      Gauer, Peter; Langeland, Henrik (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 

      Gauer, Peter; Langeland, Henrik; Salazar, Sean; Kristensen, Krister (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 

      Gauer, Peter (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 ...
    • WP1 - Container experiments - Yearly report 2021 

      Wærsted, Frøydis Meen; Hansen, Caroline Berge Hansen; Fjermestad, Halldis; Hagelia, Per (NGI-rapport;20200436-09-R, Research report, 2023-05-08)
      Container experiments investigating leaching from alum shale under different conditions were started autumn 2020 as a part of the Under Oslo project at NGI (SP13). Furthermore, leaching from alum shale mixed with different ...
    • WP1 - Mixed fractions of black shale and rhomb porphyry 

      Totland, Christian (NGI-rapport;20200436-02-R, Research report, 2023-02-20)
      When taking out potentially acid-producing black shale in construction projects, rock masses are often unintentionally mixed with masses of other rocks. The acid-producing potential of such mixed masses is uncertain, and ...
    • WP1 - Rhomb porphyry - data report 

      Børresen, Marion (NGI-rapport;20200436-08-R, Research report, 2021-12-22)
      Samples of rhomb porphyry have been characterized with chemical analyses and different leaching experiments (column, container and standard leaching tests) to study their composition and leaching properties. Results ...
    • WP1 - Temporary storage of black shales – a compilation of case studies, experiences and overall conclusions 

      Wærsted, Frøydis Meen; Slinde, Gøril Aasen; Børresen, Marion (NGI-rapport;20200436-03-R, Research report, 2023-01-09)
      As a part of the internal R&D project "Under Oslo" at NGI, several aspects of temporary storage of black shale has been investigated. Information from different experiments and cases of black shale storage from the ...
    • Årsrapport [FoU Snøskred 2012] 

      Sandersen, Frode; Jaedicke, Christian; Domaas, Ulrik; Gauer, Peter; Kronholm, Kalle (NGI-rapport;20120031-01-R, Research report, 2013-02-01)
      Rapporten beskriver aktivitetene som er gjennomført i 2012 innenfor FoU prosjektet ”Snøskred” finansiert gjennom NVE. Prosjektet er delt inn i 4 hovedområder: - Modellering - Varsling - Sikringstiltak, herunder ...
    • Øysand research site: Geotechnical characterisation of deltaic sandy-silty soils 

      Quinteros, Santiago; Gundersen, Aleksander; L'Heureux, Jean-Sébastien; Carraro, Antonio H.; Jardine, Richard (NGI-rapport;20190154-09-R, Report, 2019-12-04)
      This paper describes the geology and geotechnical engineering properties of the fluvial and deltaic gravelly-sandy-silty sediments at Øysand, Norway. Geophysical and geotechnical site investigations carried out between ...