Local tsunami run-up depending on initial localization of the landslide body at submarine slope

Abstract

The numerical simulation of tsunami induced by layer-by-layer sliding of submarine slope with various initial location of landslide body is performed. For the landslide body, an elastoplastic model with layered sediments taking into account the porosity and deconsolidation of the landslide mass, resting on a relatively rigid base, is used. The characteristic parameters of the above model correspond to those of the landslide and tsunami event in the Corinth Bay on February 7, 1963 modeled by the authors (Papadopoulos et al. 2007). To numerically represent the dynamics of landslide motion numerical code FLAC is used, which in contrast to the finite element method implements an explicit finite-difference scheme for solving three-dimensional problems of continuum mechanics, and allows simulation of the nonlinear behavior of porous-saturated grounds under conditions of plastic flow above the yield stress. Because of plane slope conditions, the nonlinear system of shallow water equations is used for the numerical simulation of tsunami. The results demonstrate that at each time moment, the tsunami runup occurs at novel surface of the coastal slope that leads to complex repositioning of the shoreline point that depends on initial location of the landslide volume. Such an observation is absent in conventional (e.g. rigid block, viscoplastic etc.) models The results of the work demonstrate a rather physical picture of the process under consideration. More importantly modeling results of this work may help in identifying the generating mechanism of historical or future landslide tsunamis.

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Acknowledgments

The authors are grateful to the editor for helpful comments, suggestions, and improvement of the English text.

Funding

This work has been supported by the Russian Federation State Program 5-100 and State assignment (project 0149-2019-0005).

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Correspondence to Raissa Mazova.

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Lobkovsky, L., Mazova, R., Remizov, I. et al. Local tsunami run-up depending on initial localization of the landslide body at submarine slope. Landslides 18, 897–907 (2021). https://doi.org/10.1007/s10346-020-01489-1

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Keywords

  • Local tsunami
  • Submarine landslide localization
  • Elastic-plastic landslide model
  • Numerical simulation