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Communication Dans Un Congrès Année : 2023

Generation of tsunami waves by landslides

Résumé

Tsunami waves can be generated by earthquakes but also by landslides such as by the recent partial flank collapse of Anak Krakatau (Indonesia) in 2018. To improve the prediction of these dangerous waves, we have considered the gravity driven collapse of a granular column into water in a quasi-two-dimensional setup and systematically investigated the influence of the initial geometry of the column and the water depth on the impulse wave generated. Our experiments reveal three nonlinear wave regimes: transient bores and solitary waves for shallow water, and ``Cauchy-Poisson" waves for deep water. By coupling the dynamics of the column collapse to the wave generation in shallow water, we develop a model that allows us to estimate the amplitude of the generated wave either to the initial conditions or to the final immersed volume of grains. As a result, the tsunami wave generated by a landslide can be estimated from the knowledge of the pre-landslide geometry and bathymetry in a preventive approach, or from the final immersed deposit of a past geophysical event. The present modeling contributes to a better understanding of such events with complex granular and fluid flows.

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Dates et versions

hal-04440281 , version 1 (05-02-2024)

Identifiants

  • HAL Id : hal-04440281 , version 1

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Philippe Gondret. Generation of tsunami waves by landslides. Fluids and Complexity III, Dec 2023, Nice, France. ⟨hal-04440281⟩
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