Definition of the Subject
Tsunami inundation is the one of the final stages of tsunami evolution, when the wave encroaches upon and floods dry land. It is during this stagethat a tsunami takes the vast majority of its victims. Depending on the properties of the tsunami (e. g. wave height and period) and the beachprofile (e. g. beach slope, roughness), the tsunami may approach as a relatively calm, gradual rise of the ocean surface or as an extremelyturbulent and powerful bore – a wall of white water. The characteristics of this approach determine the magnitude and type of damage tocoastal infrastructure and, more importantly, the actions required of coastal residents to find a safe retreat or shelter.
To gage the nearshore impact of tsunami inundation, engineers and scientists rely primarily on three different methods: 1) Field survey of pastevents, 2) Physical experimentation in a laboratory, and 3) Numerical modeling. It is the last of these methods – numerical simulation oftsunami...
Abbreviations
- Beach profile:
-
A cross-shore, or normal to the beach, survey of the seafloor and dry ground elevation (bathymetry and topography); a series of spatial location and bottom elevation data pairs.
- Bore:
-
A steep hydraulic front which transitions between areas of different water level. Tsunamis can approach land as a turbulent, breaking bore if the incident tsunami is of sufficiently large height.
- Boussinesq equations:
-
An approximate equation model, used for waves with wave length of at least two times the local water depth; a long-wave-based model, but includes some frequency dispersion
- Dispersion, amplitude:
-
The separation of wave components due to a wave‐height related difference in wave speed; all else being equal, a wave with a large height will travel faster than one with a small height.
- Dispersion, frequency:
-
The separation of wave components due to a frequency related difference in wave speed; all else being equal, a wave with a longer period will travel faster than one with a short period.
- Navier–Stokes equations:
-
The full equations of fluid motion, including dissipation through the fluid molecular viscosity only. Other models discussed here, namely the Shallow Water Wave and Boussinesq equations, are approximations to these equations.
- Runup, or runup height:
-
The ground elevation (a vertical measure) at the furthest point of landward inundation.
- Shallow water wave equations:
-
An approximate equation model, used for waves with wave length many times larger than the water depth; a non‐dispersive, long-wave model; there is no frequency dispersion in this model.
- Tsunami inundation:
-
The spatial area flooded as a tsunami rushes inland.
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Lynett, P.J. (2009). Tsunami Inundation, Modeling of. In: Meyers, R. (eds) Encyclopedia of Complexity and Systems Science. Springer, New York, NY. https://doi.org/10.1007/978-0-387-30440-3_569
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