Blar i NGI articles på forfatter "Issler, Dieter"

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    • Avalanches on Mt. Fuji, Japan: Seismic detection and tracking combined with numerical simulations 

      Pérez-Guillén, Cristina; Tsunematsu, Kae; Kouichi, Nishimura; Issler, Dieter (Lecture, 2018)

    • Back-calculations of observed avalanches against natural deflecting dams 

      Issler, Dieter; Harbitz, Carl Bonnevie; Domaas, Ulrik; Kronholm, Kalle; Christen, Marc (The International Snow Science Workshop (ISSW) Proceedings;, Chapter, 2012)
      The objective of this study is to assess the reliability of presently available numerical avalanche models in predicting avalanche flow about deflecting natural terrain features such as large boulders or moraine ridges. ...

    • Comments on avalanche flow models based on the concept of random kinetic energy 

      Issler, Dieter; Jenkins, JT; McElwaine, J.N. (Peer reviewed; Journal article, 2017)
      In a series of papers, Bartelt and co-workers developed novel snow-avalanche models in which random kinetic energy RK (a.k.a. granular temperature) is a key concept. The earliest models were for a single, constant density ...

    • Comments on “On a Continuum Model for Avalanche Flow and Its Simplified Variants” by S. S. Grigorian and A. V. Ostroumov 

      Issler, Dieter (Others, 2020)
      This note first summarizes the history of the manuscript “On a Continuum Model for Avalanche Flow and Its Simplified Variants” by Grigorian and Ostroumov—published in this Special Issue—since the early 1990s and explains ...

    • A comparison of avalanche models with data from dry-snow avalanches at Ryggfonn, Norway 

      Issler, Dieter; Harbitz, Carl Bonnevie; Kristensen, Krister; Lied, Karstein; Moe, Arne; Barbolini, M.; Khazaradze, G.; McElwaine, J.N.; Mears, A.I.; Naaim, M.; Sailer, R. (Chapter, 2005)
      Twelve well-documented dry-snow avalanches from the instrurnented Ryggfonn path in western Norway were selected for back-ca1culations with several dynamical avalanche models. In each case, the run-out distance, the front ...

    • Conclusions from a recent survey of avalanche computational models 

      Harbitz, Carl Bonnevie; Issler, Dieter; Keylock, Christopher J. (NGI Publication;203, Chapter, 1998)
      In this paper we summarise a survey report on computational models for snow avalanche motion that was developed within the frame-work of the EU research project SAME (Snow Avalanche Modelling, Mapping and Warning in Europe). ...

    • The design of avalanche protection dams : Recent practical and theoretical developments 

      Barbolini, Massimiliano; Domaas, Ulrik; Faug, Thierry; Gauer, Peter; Hákonardóttir, Kristín Martha; Harbitz, Carl Bonnevie; Issler, Dieter; Jóhannesson, Tómas; Lied, Karstein; Naaim, Mohamed; Naaim-Bouvet, Florence (EUR;23339, Research report, 2009)
      This book discusses the design of dams and other protective measures in the run-out zones of wet- and dry-snow avalanches. It summarises recent theoretical developments and the results of field and laboratory studies, ...

    • The design of avalanche protection dams. Recent practical and theoretical developments 

      Johannesson, Tomas; Gauer, Peter; Lied, Karstein; Barbolini, Massimiliano; Domaas, Ulrik; Faug, Thierry; Hakonardottir, Kristin Martha; Harbitz, Carl Bonnevie; Issler, Dieter; Naaim, Florence; Naaim, Mohamed; Rammer, Lambert (Lecture, 2008)
      Recent experimental and theoretical studies of the flow of avalanches against obstructions have been used, in combination with traditional design guidelines, to formulate recommendations for the design of dams and other ...

    • Dynamically consistent entrainment laws for depth-averaged avalanche models 

      Issler, Dieter (Journal article; Peer reviewed, 2014)
      The bed entrainment rate in a gravity mass flow (GMF) is uniquely determined by the properties of the bed and the flow. In depth-averaging, however, critical information on the flow variables near the bed is lost and ...

    • Dynamique et modélisation des avalanches 

      Issler, Dieter (Chapter, 2010)
      This chapter summarizes observations and experimental findings on the dynamics of snow avalanches that are important to understand when developing or applying numerical models for the calculation of runout distances, ...

    • Emerging insights into the dynamics of submarine debris flows 

      Elverhøi, Anders; Issler, Dieter; De Blasio, Fabio V.; Ilstad, Trygve; Harbitz, Carl Bonnevie; Gauer, Peter (Journal article, 2005)
      Recent experimental and theoretical work on the dynamics of submarine debris flows is summarized. Hydroplaning was first discovered in laboratory flows and later shown to likely occur in natural debris flows as well. It ...

    • Exploring the significance of the fluidized flow regime for avalanche hazard mapping. 

      Issler, Dieter; Gauer, Peter (Journal article, 2008)
      Observational and experimental evidence suggests that it is important to explicitly account for the fluidized flow regime in avalanche hazard mapping due to its high mobility, intermediate density and high velocity. We ...

    • Inferences on flow mechanisms from snow avalanche deposits 

      Issler, Dieter; Errera, Alessia; Priano, Stefano; Gubler, Hansueli; Teufen, Bernardo; Krummenacher, Bernhard (Journal article, 2008)
      The deposit structure of 20 very small to large avalanches that occurred in the Davos area, eastern Swiss Alps, during winters 2004/05 and 2005/06 was investigated. Snow-cover entrainment was significant in the majority ...

    • Inferences on Mixed Snow Avalanches from Field Observations 

      Issler, Dieter; Gauer, Peter; Schaer, Mark; Keller, Stefan (Peer reviewed; Journal article, 2019)
      Observations of the deposits, flow marks, and damages of three mixed-snow avalanches of widely different size were analyzed with regard to flow regimes, velocities, pressures, densities, flow depths, erosion modes, and ...

    • Interplay of entrainment and rheology in snow avalanches: a numerical study 

      Issler, Dieter; Pérez, Manuel Pastor (Journal article, 2011)
      A one-dimensional evolution equation for the slope-normal velocity profile of a streamwise uniform avalanche over an entrainable bed is derived. The boundary conditions are no slip at the bed, a stress-free surface and ...

    • Landslide Material Control on Tsunami Genesis ‐ The Storegga Slide and Tsunami (8100 y BP) 

      Kim, Jihwan; Løvholt, Finn; Issler, Dieter; Forsberg, Carl Fredrik (Peer reviewed; Journal article, 2019)
      Tsunami generation from sub‐aqueous landslides is controlled by landslide kinematics, which in turn is governed by the material properties of the slide mass. Yet, the effect of the material properties on tsunami‐genesis ...

    • On full-scale avalanche measurements at the Ryggfonn test site, Norway. 

      Gauer, Peter; Issler, Dieter; Lied, Karstein; Kristensen, Krister; Iwe, H.; Lied, Erik; Rammer, L.; Schreiber, H. (Journal article, 2007)
      Avalanche measurements carried out at the Ryggfonn test site, Norway, during several winter seasons are analyzed with emphasis on recognizing different flow regimes and estimating flow densities. Measurements include impact ...

    • On snow avalanche flow regimes: Inferences from observations and measurements. 

      Gauer, Peter; Issler, Dieter; Lied, Karstein; Kristensen, Krister; Sandersen, Frode (The International Snow Science Workshop (ISSW) Proceedings;, Chapter, 2008)
      Mixed dry-snow avalanches are commonly thought to consist of a dense core and a dilute suspension layer, even though observations and measurements from Canada and Russia have long indicated the presence of an intermediate-density ...

    • Perspectives on snow avalanche dynamics research 

      Nishimura, Kouichi; Barpi, Fabrizio; Issler, Dieter (Peer reviewed; Journal article, 2021)

    • Possible erosion mechanisms in snow avalanches 

      Gauer, Peter; Issler, Dieter (Journal article, 2004)
      Snow erosion and entrainment processes in avalanches are classified according to their mechanisms, the flow regimes in which they occur, and their spatial position within the avalanche. Simple, but process-specific, models ...