International Snow Science Workshop Proceedings - Montana State University Library

Item: RAMMS::EXTENDED - SENSITIVITY ANALYSIS OF NUMERICAL FLUIDIZED POWDER AVALANCHE SIMULATION IN THREE-DIMENSIONAL TERRAIN

• • Title: RAMMS::EXTENDED - SENSITIVITY ANALYSIS OF NUMERICAL FLUIDIZED POWDER AVALANCHE SIMULATION IN THREE-DIMENSIONAL TERRAIN

    Proceedings: International Snow Science Workshop Proceedings 2023, Bend, Oregon

    Authors:

    • J. Glaus   [ WSL Institute for Snow and Avalanche Research SLF, Davos Dorf, Switzerland ]  [ Climate Change, Extremes, and Natural Hazards in Alpine Regions Research Center CERC, Davos Dorf, Switzerland ]  [ Institute for Geotechnical Engineering, ETH Zürich, Zürich, Switzerland ]
    • K. Wikstrom Jones   [ Alaska Division of Geological & Geophysical Surveys, Anchorage, AK, USA ]
    • Y. Bühler  [ WSL Institute for Snow and Avalanche Research SLF, Davos Dorf, Switzerland ]  [ Climate Change, Extremes, and Natural Hazards in Alpine Regions Research Center CERC, Davos Dorf, Switzerland ]
    • M. Christen   [ WSL Institute for Snow and Avalanche Research SLF, Davos Dorf, Switzerland ]  [ Climate Change, Extremes, and Natural Hazards in Alpine Regions Research Center CERC, Davos Dorf, Switzerland ]
    • P. Ruttner-Jansen   [ WSL Institute for Snow and Avalanche Research SLF, Davos Dorf, Switzerland ]  [ Climate Change, Extremes, and Natural Hazards in Alpine Regions Research Center CERC, Davos Dorf, Switzerland ]  [ Institute of Geodesy and Photogrammetry, ETH Zürich, Zürich, Switzerland ]
    • J. Gaume   [ WSL Institute for Snow and Avalanche Research SLF, Davos Dorf, Switzerland ]  [ Climate Change, Extremes, and Natural Hazards in Alpine Regions Research Center CERC, Davos Dorf, Switzerland ]  [ Institute for Geotechnical Engineering, ETH Zürich, Zürich, Switzerland ]
    • P. Bartelt   [ WSL Institute for Snow and Avalanche Research SLF, Davos Dorf, Switzerland ]  [ Climate Change, Extremes, and Natural Hazards in Alpine Regions Research Center CERC, Davos Dorf, Switzerland ]

    Date: 2023-10-08

    Abstract: In this paper, we present a sensitivity analysis of RAMMS::EXTENDED, a numerical software for avalanche simulations that includes the reconstruction of the avalanche core and powder cloud. It is a further developed version of the well known avalanche simulation tool RAMMS::AVALANCHE. Our results are based on the reconstruction of an avalanche that released in 2019 in the Dischma Valley, Switzerland. The avalanche was surveyed with drone-based photogrammetry and provides detailed information about the expansion of the release zone, snow height and avalanche run-out. First, the analysis is carried out on a planar surface representing the avalanche track, and excludes the effects of the terrain. In a second step, the same parameters are tested on a digital terrain model that represents the real avalanche path. Both topographies are evaluated for a local and a global sensitivity analysis. The analysis is restricted on the input parameters a practitioner can measure, the disposition of mass on the slope (release depth, erosion depth and erosion gradient) and the snow temperature (release temperature and snowpack temperature gradient) were varied. The result of the analysis helps to better understand the influence of each model parameter.

    Object ID: ISSW2023_P2.26.pdf

    Language of Article: English

    Presenter(s): Julia Glaus

    Keywords: avalanche simulation, powder avalanche, entrainment, road safety

    Page Number(s): 795 - 802

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