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5.4  The 2004 Indian Ocean tsunami

Stéphane Popinet
gerris2D -m tsunami.gfs | gfsview2D tsunami.gfv
Required files
tsunami.gfs (view) (download)
output.gfs tsunami.gfv h.gfv level.gfv hmax.gfv hmax-detail.gfv hanires.txt diegres.txt maleres.txt colores.txt ganares.txt jason.xy jasonres.txt
Running time

The 2004 Indian Ocean tsunami was caused by a large-scale fault rupture (> 1000 km) at the Indian–Australian and Eurasian–Andaman plate boundaries. This example uses the fault model of Grilli et al. [1] as initial conditions to a Saint-Venant solution of the subsequent tsunami. The evolution of the wave elevation is illustrated in the animation of Figure 44.a. Adaptivity is used to track the various wave fronts (Figure and animation 44.b) and the terrain is reconstructed dynamically based on the ETOPO1 dataset.

Figure 44: (a) Animation of wave elevation. Dark red is larger than 2 m, dark red smaller than -2 m. (b) Animation of adaptive level of refinement. Dark red is 0.8 nautical miles, dark blue is 101 nautical miles.

The maximum wave elevation reached over 10 hours after fault rupture is illustrated on Figure 45.

Figure 45: Maximum wave elevation reached over 10 hours, 1 metre interval contours. (a) Bay of Bengal, dark blue zero, dark red >5 m. (b) Detail near Northern Sumatra and Thailand, dark blue zero, dark red > 8 m.

Finally Figure 46 gives a comparison of the observed (using tide gauges) and modelled timeseries at specific locations in the Indian Ocean. Figure 47 gives a comparison of the modelled wave profile with the profile observed by the Jason-1 satellite altimeter.

Figure 46: Observed and modelled time-series of wave elevation (metres) at different tide gauge locations. Horizontal axis is time in hours after the initial fault rupture.
Hannimaadhoo, MaldivesDiego Garcia
Male, MaldivesColumbo, Sri Lanka
Gan, Maldives

Figure 47: Observed (Jason-1 satellite altimeter) and modelled wave profiles.

More details on this simulation and the method used is given in [4].

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