You are in the STAGING environment

Document / Publication

  • Do more with your content!Discover PreventionWeb Services
  • Nonlinear regimes of tsunami waves generated by a granular collapse

    Email sent!

    An email has been sent to the email addresses provided, with a link to this content.

    Thank you for sharing!


Nonlinear regimes of tsunami waves generated by a granular collapse

Source(s):  Journal of Fluid Mechanics

In this paper, the authors characterize experimentally the waves generated by the gravity-driven collapse of a dry granular column into water. Tsunami waves induced by landslides are a threat to human activities and safety along coastal areas. The generation of tsunami waves by landslides may be triggered by volcanic or seismic events not only in the ocean, but also in lakes or rivers, due to the collapse or avalanche of either soil, rocks, or even ice and snow. 

In this study, three nonlinear wave regimes are identified depending on the Froude number 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 Froude number, solitary waves for intermediate values of Froude number, and non-linear transition waves at small Froude number. The wave amplitude relative to the water depth increases with Froude number in the three regimes but with different non-linear scalings, and the relative wavelength is an increasing or decreasing function of Froude number. 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.

Add this content to your collection!

Enter an existing tag to add this content to one or more of your current collections. To start a new collection, enter a new tag below.

See My collections to name and share your collection
Back to search results to find more content to tag

Log in to add your tags
  • Nonlinear regimes of tsunami waves generated by a granular collapse
  • Publication date 2021
  • Author(s) Sarlin, Wladimir; Morize, Cyprien; Sauret, Alban et al.
  • Number of pages 11 p.
  • ISBN/ISSN 10.1017/jfm.2021.400 (DOI)

Please note:Content is displayed as last posted by a PreventionWeb community member or editor. The views expressed therein are not necessarily those of UNDRR PreventionWeb, or its sponsors. See our terms of use