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In many cases, tsunami waveheights and effects show a high variability along the coast. The possible causes are insecurities about the tectonic
 

Summary: In many cases, tsunami waveheights and effects show a high variability
along the coast. The possible causes are insecurities about the tectonic
plate motion, variability of bathymetry and interference between
incoming and reflected waves. The understanding of the basic causes and
effects is vital for reliable predictions that can support risk analysis and
hazard mitigation.
In this poster we emphasize one aspect that may contribute to high
variability along coast. A relatively narrow and shallow elongated area in
propagation direction of a tsunami wave can produce largely amplified
waves by near coast tsunami waveguiding, see [1]. The waveguiding is
caused by the fact that different propagation speeds of waves between
deeper and shallower part in the bathymetry give rise to characteristic
distortions of the surface elevation near the waveguide. Inside the
waveguide region the wave will have a largely amplified waveheight. But
outside the waveguide the distorted wave has to adjust to the finite
amplitude undisturbed external wave, which will influence both the
profile and the velocity of guided tsunami waves, and which causes
substantial transversal variability.
Tsunami Waveguiding Simulation
Above Synthetic and Realistic Bathymetries

  

Source: Al Hanbali, Ahmad - Department of Applied Mathematics, Universiteit Twente

 

Collections: Engineering