@article{PAR00007859,
  title = {{N}umerical modelling of the tsunami triggered by the {G}uimar debris avalanche, {T}enerife ({C}anary {I}slands) : {C}omparison with field-based data},
  author = {{G}iachetti, {T}. and {P}aris, {R}. and {K}elfoun, {K}arim and {P}erez-{T}orrado, {F}. {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}ome tsunami deposits have been previously identified 41-188 mast in the {A}gaete {V}alley on the northwest coast of the island of {G}ran {C}anaria, in the {C}anary {I}slands. {I}n this paper, the {G}uimar sector collapse ({T}enerife, similar to 0.83 {M}a), and its expected associated tsunami that is thought to be at the origin of these tsunami deposits, are tentatively reproduced using a two-fluid numerical code. {T}wo failure processes are considered: 1) the whole 44 km(3) volume is released in one go, or 2) the 44 km(3) are released in five retrogressive failures of equal volume, occurring each 120 s. {I}n both cases, two rheologies are used to simulate the landslide propagation: the {M}ohr-{C}oulomb frictional law and a constant retarding stress. {T}wo hypotheses concerning the origin of the offshore mapped deposits are also considered: 1) the mapped deposits are the direct result of a single collapse event occurring either in one go or by near retrogressive failures, or 2) the mapped deposits result from a collapse followed by later partial remobilization of its deposits. {I}n all scenarios, the subaerial destabilisation spreads out eastwards into the sea, triggering waves 390-500 m high when considering a collapse in one go, and 225-380 m when considering successive retrogressive failures. {T}he first wave reaches the coast of {G}ran {C}anaria, located at 70 km from the scar, 495-560 s after the collapse onset, whatever the scenario considered. {W}ater enters the {A}gaete {V}alley on {G}ran {C}anaria 555-690 s after the onset of collapse, reaching up to 9.1 km inland for a collapse in one go, and 5.0 km when considering five retrogressive failures. {I}n this valley, the simulated waves inundate all the locations where tsunami deposits were identified, with the flow depth measured reaching a maximum of 50 m (collapse by retrogressive failures) to 150 m (collapse in one go) at these particular places. {T}he directions of maximum kinetic energy as a function of time for the simulated waves are consistent with the current directions recorded by the cobble fabrics present in the run-up and backwash layers of the tsunami deposits at one outcrop. {T}his study shows that the major source of uncertainty when reproducing landslide-triggered tsunamis is linked to the way the landslide happens (failure mechanisms), that should be thus more precisely taken into account for landslide-triggered-tsunamis hazard assessment. {T}he rheology chosen to simulate the landslide propagation has only a second-order impact on the produced waves.},
  keywords = {tsunami ; numerical modelling ; debris avalanche ; {G}uimar flank collapse ; {C}anary {I}slands ; {T}enerife ; {G}ran {C}anaria ; {A}gaete {V}alley ; tsunami ; deposits ; field-based data},
  booktitle = {},
  journal = {{M}arine {G}eology},
  volume = {284},
  numero = {1-4},
  pages = {189--202},
  ISSN = {0025-3227},
  year = {2011},
  DOI = {10.1016/j.margeo.2011.03.018},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00007859},
}