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Article Dans Une Revue Journal of Fluid Mechanics Année : 2021

Non-linear regimes of tsunami waves generated by a granular collapse

Résumé

Tsunami waves induced by landslides are a threat to human activities and safety along coastal areas. In this paper, we characterize experimentally the waves generated by the gravity-driven collapse of a dry granular column into water. Three nonlinear wave regimes are identified depending on the Froude number Fr based on the ratio of the velocity of the advancing granular front and the velocity of linear gravity waves in shallow water: transient bores for large Fr , solitary waves for intermediate values of Fr , and non-linear transition waves at small Fr. The wave amplitude relative to the water depth increases with Fr in the three regimes but with different non-linear scalings, and the relative wavelength is an increasing or decreasing function of Fr. Two of these wave regimes are rationalized by considering that the advancing granular front acts as a vertical piston pushing the water, while the last one is found to be a transition from shallow to deep water conditions. The present modeling contributes to a better understanding of the rich hydrodynamics of the generated waves, with coastal risk assessment as practical applications.
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Dates et versions

hal-03241660 , version 1 (28-05-2021)

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Wladimir Sarlin, Cyprien Morize, Alban Sauret, Philippe Gondret. Non-linear regimes of tsunami waves generated by a granular collapse. Journal of Fluid Mechanics, 2021, 919, ⟨10.1017/jfm.2021.400⟩. ⟨hal-03241660⟩
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