Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmos53b1314e&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #OS53B-1314
Other
1810 Debris Flow And Landslides, 3070 Submarine Landslides, 4500 Oceanography: Physical, 4546 Nearshore Processes
Scientific paper
In an experimental framework, the generation of tsunami waves can be considered as a two-dimensional or three-dimensional problem by finding the respective geometry of the experimental set up. In nature, of course, it is a fully three-dimensional problem. The generation of tsunami waves caused by landslides (submarine and subaerial) must be approached as a dynamical problem. The understanding of the slide body's dynamics plays a key role in understanding the generated waves. Numerical calculations are a standard tool in tsunami science as the propagation of long waves can be tackled with depth-averaged equations. These classical models have often been used for modeling the propagation and run up of those tsunami waves caused by earthquakes. Tsunamis generated during slide motion are different. They are shorter and have larger amplitudes. It could be demonstrated in respective laboratory experiments and two dimensional numerical studies that in the initial phase the behavior of the waves is very complex, resulting in wave breaking and plunging. We conducted hydrocode simulations to model the generation of tsunami by slide in two dimensions. Results could show the complexity of the initial wave evolution as well as the development of the slide body itself. As an extension to these two-dimensional simulations, we now consider the three-dimensional problem and reveal some differences to the two-dimensional results. For this purpose we are using iSALE-3D, a multi- material, multi-rheology hydrocode capable of studying landslide processes in both two and three dimensions. iSALE-3D has been originally developed to study shock waves and high pressure scenarios like meteorite impacts or explosions and has been successfully validated against theoretical and experimental results as well as other numerical codes. Previous studies revealed differences in the formation and propagation of oceanic waves caused by meteorite impacts at different angles of incidence. Hence, for landslide scenarios we suggest a possibility of an asymmetric wave formation which may differ substantially from those derived by commonly used two-dimensional approximations.
Elbeshausen Dirk
Weiss Rai
Wünnemann Kai
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