Écoulement granulaire fluidisé impactant l'eau : Application aux tsunamis volcaniques

Abstract : Tsunamis generated by the collapse of a granular mass into water represent a low amount of documented tsunamis in the world. However, they can locally cause severe human and material damages as they occur near coastlines. In order to identify physical mecanisms controlling the features of induced waves, the simple configuration of a granular material entering into water has been widely investigated. This study extends the configuration to the case of a fluidized granular flow, representative of tsunamis generated by pyroclastic flows during volcanic eruptions. We show that, in dam-break configuration, the fluidization process enhances the mobility of the granular flow with larger front velocities and larger propagation distances of the mass. The consequence is a significant increase of the maximum wave amplitude in comparison to an analogous situation without fluidization. The influence of the impact velocity and of the mass on the amplitude of the wave is also supported by varying the initial height of the granular column released. Finally, we show that the level of water does not affect the characteristics of the wave, in the range of parameters considered here.
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Alexis Bougouin, R. Paris, O Roche. Écoulement granulaire fluidisé impactant l'eau : Application aux tsunamis volcaniques. 24ème Congrès Français de Mécanique, Aug 2019, Brest, France. ⟨hal-02431199⟩

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