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Snow avalanches striking water basins: behaviour of the avalanche’s centre of mass and front

Author

Listed:
  • G. Zitti

    (Università Politecnica delle Marche)

  • C. Ancey

    (Ecole Polytechnique Fédérale de Lausanne)

  • M. Postacchini

    (Università Politecnica delle Marche)

  • M. Brocchini

    (Università Politecnica delle Marche
    Ecole Polytechnique Fédérale de Lausanne)

Abstract

We study the behaviour of a low-density granular material entering a water basin by means of a simplified two-dimensional model, with the aim to understand the dynamics of a snow avalanche impacting a water basin like an alpine lake or a fjord. The low density of the impacting mass induces an uplift buoyancy force and, consequently, a complicated interaction between the solid and fluid phase. This paper provides an insight into the motion of the impacting mass, by presenting a simplified, two-dimensional model, where the snow is described by a low-density granular material. First, small-scale experiments, based on the Froude similarity with snow avalanches, are used to evaluate the motion of reference points of the impacting mass, i.e. the front (F), centre of mass (C) and deepest point (L). Then, applying the mass and momentum conservation principles to a fixed volume, we show that the mean motion of the impacting mass is similar to that of a damped oscillator. The stretch of the impacting mass motion is described through the motion of the reference points F and L.

Suggested Citation

  • G. Zitti & C. Ancey & M. Postacchini & M. Brocchini, 2017. "Snow avalanches striking water basins: behaviour of the avalanche’s centre of mass and front," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 88(3), pages 1297-1323, September.
    • Handle: RePEc:spr:nathaz:v:88:y:2017:i:3:d:10.1007_s11069-017-2919-y
    DOI: 10.1007/s11069-017-2919-y
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    References listed on IDEAS

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    1. F. Montagna & G. Bellotti & M. Di Risio, 2011. "3D numerical modeling of landslide-generated tsunamis around a conical island," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 58(1), pages 591-608, July.
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    Cited by:

    1. Zhenzhu Meng & Jianyong Hu & Jinxin Zhang & Lijuan Zhang & Zhenxia Yuan, 2023. "The Momentum Transfer Mechanism of a Landslide Intruding a Body of Water," Sustainability, MDPI, vol. 15(18), pages 1-18, September.

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