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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 7, issue 1
Nat. Hazards Earth Syst. Sci., 7, 141–147, 2007
https://doi.org/10.5194/nhess-7-141-2007
© Author(s) 2007. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Special issue: Tsunamis

Nat. Hazards Earth Syst. Sci., 7, 141–147, 2007
https://doi.org/10.5194/nhess-7-141-2007
© Author(s) 2007. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  26 Jan 2007

26 Jan 2007

On the weak impact of the 26 December Indian Ocean tsunami on the Bangladesh coast

M. Ioualalen1, E. Pelinovsky2, J. Asavanant3, R. Lipikorn3, and A. Deschamps1 M. Ioualalen et al.
  • 1Geosciences Azur, IRD-CNRS-UPMC-UNSA, Villefranche-sur-mer, France
  • 2Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, Russia
  • 3Department of Mathematics, Faculty of Science, Chulalongkorn University, Bangkok, Thailand

Abstract. The 26 December 2004 Indian Ocean tsunami damaged severely most of the Gulf of Bengal's coastal areas, but the coast of Bangladesh which stands at the edge of an extraordinarily extended continental shelf. This latter feature has been built through huge discharges of river sediments along the Brahmaputra and Ganges rivers. As a result of this enormous discharge, another interesting feature of the area is the deep underwater Canyon, connected with the estuaries, running NE-SW from 25 km off the coast towards the continental slope.

We investigate here how these two geological features may have modified/perturbed the Indian ocean tsunami propagation and impact on the Coast of Bangladesh. For that purpose we have realized an ensemble of numerical simulations based on Funwave Boussinesq numerical model and a validated coseismic source. It is found, at first order, that the extended shallow bathymetric profile of the continental shelf plays a key role in flattening the waveform through a defocussing process while the Canyon delays the process. The wave evolution seems to be related at first order to the bathymetric profile rather than to dynamical processes like nonlinearity, dispersion or bottom friction.

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