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
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
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.
Total article views: 352 (including HTML, PDF, and XML)
HTML
PDF
XML
Total
BibTeX
EndNote
277
72
3
352
6
5
HTML: 277
PDF: 72
XML: 3
Total: 352
BibTeX: 6
EndNote: 5
Views and downloads (calculated since 30 Jul 2019)
Cumulative views and downloads
(calculated since 30 Jul 2019)
Viewed (geographical distribution)
Total article views: 150 (including HTML, PDF, and XML)
Thereof 149 with geography defined
and 1 with unknown origin.
Country
#
Views
%
Total:
0
HTML:
0
PDF:
0
XML:
0
1
1
Cited
Saved
No saved metrics found.
Discussed
No discussed metrics found.
Latest update: 11 Dec 2019
Search articles
Download
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...