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Discussion papers
https://doi.org/10.5194/nhess-2019-225
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2019-225
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 30 Jul 2019

Submitted as: research article | 30 Jul 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).

La Palma landslide tsunami: computation of the tsunami source with a calibrated multi-fluid Navier–Stokes model and wave impact assessment with propagation models of different types

Stéphane Abadie1, Alexandre Paris1,2,3, Riadh Ata4, Sylvestre Le Roy5, Gael Arnaud6, Adrien Poupardin2,3, Lucie Clous1, Philippe Heinrich3, Jeffrey Harris4, Rodrigo Pedreros5, and Yann Krien6 Stéphane Abadie et al.
  • 1UNIV PAU & PAYS ADOUR/ E2S UPPA, Laboratoire des Sciences de l'Ingénieur Appliquées à la Mécanique et au Génie Electrique, Fédération IPRA, EA4581, 64600, ANGLET, France
  • 2Laboratoire de Géologie, Ecole normale supérieure/CNRS UMR8538, PSL Research University, Paris, France
  • 3CEA, DAM, DIF, Arpajon 91297, France
  • 4LHSV, Ecole des Ponts, CEREMA, EDF R et D, Chatou, France
  • 5BRGM, Orléans, France
  • 6Université des Antilles, Laboratoire LARGE, Campus de Fouillole, 97157 Pointe-a-Pitre, Guadeloupe

Abstract. In this paper, we present a new source assessment of the La Palma collapse scenario previously described and studied in Abadie et al. (2012). Three scenarios (i.e., slide volumes of 20, 40 and 80 km3) are considered, from the initiation of the slide to the water waves generation, using THETIS, a 3D Navier–Stokes model. The slide is considered as a Newtonian fluid whose viscosity is adjusted to approximate a granular behavior. After 5 minutes of propagation with THETIS, the generated water wave is transferred into FUNWAVE-TVD for 15 minutes of Boussinesq model simulation. Then, four different depth-averaged codes are used to propagate the wave to the Guadeloupe area, Europe and French coasts. Finally, the wave impact in terms of run-up is evaluated through direct computations in specific areas or using theoretical formulas. Although the wave source appears reduced due to the rheology used compared to former works, the wave impact is still significant for the maximum slide volume considered on surrounding islands and coasts, as well as on remote most exposed coasts such as Guadeloupe. In Europe and in France, the wave impact is moderate (for specific areas in Spain and Portugal) to weak (Atlantic French coast). The comparison between the different wave models in overlapping computational regions shows an overall agreement in terms of first wave amplitude and time of arrival, but differences appear in the trailing waves.

Stéphane Abadie et al.
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Stéphane Abadie et al.
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Short summary
The tsunami which could be generated by a potential flank collapse of the Cumbre Vieja volcano in La Palma Canary Island is evaluated through numerical simulation based on an advanced and finely calibrated model. Then the consequences of such an event for Europe, France and Guadeloupe island are investigated using different numerical models for propagation. The impacts vary from negligible to very significant depending on the location considered.
The tsunami which could be generated by a potential flank collapse of the Cumbre Vieja volcano...
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