Articles | Volume 8, issue 2
Nat. Hazards Earth Syst. Sci., 8, 175–185, 2008
https://doi.org/10.5194/nhess-8-175-2008
Nat. Hazards Earth Syst. Sci., 8, 175–185, 2008
https://doi.org/10.5194/nhess-8-175-2008

  03 Mar 2008

03 Mar 2008

Near-coast tsunami waveguiding: phenomenon and simulations

E. van Groesen1,2, D. Adytia2, and Andonowati1,2,3 E. van Groesen et al.
  • 1Department of Applied Mathematics, University of Twente, The Netherlands
  • 2LabMath-Indonesia, Bandung, Indonesia
  • 3Department of Mathematics, Institut Teknologi Bandung, Indonesia

Abstract. In this paper we show that shallow, elongated parts in a sloping bottom toward the coast will act as a waveguide and lead to large enhanced wave amplification for tsunami waves. Since this is even the case for narrow shallow regions, near-coast tsunami waveguiding may contribute to an explanation that tsunami heights and coastal effects as observed in reality show such high variability along the coastline. For accurate simulations, the complicated flow near the waveguide has to be resolved accurately, and grids that are too coarse will greatly underestimate the effects. We will present some results of extensive simulations using shallow water and a linear dispersive Variational Boussinesq model.

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