HR: 09:15h
AN: S51C-06    [Abstracts]
TI: Understanding tsunami by landslides as the next challenge for hazard, risk and mitigation: Insight from multi-material hydrocode modeling
AU: * Weiss, R
EM: Robert.Weiss@noaa.gov
AF: NOAA Center for Tsunami Research PMEL/University of Washington, 7600 Sand Point Way NE, Seattle, WA 98115, United States
AU: Wuennemann, K
AF: Museum for Natural Sciences Humboldt-University, Berlin, Invalidenstr. 43, Berlin, 10115, Germany
AB: Sliding bodies, either traveling inside the water column or impacting into water, generate waves. Depending on the volume, velocity, and material properties of the moving mass, waves of significant height and length are generated. Such waves can be considered tsunami waves, even if their characteristic is profoundly different from "classical" tsunami generated by earthquakes. Most models of landslide-induced tsunami waves focus on the propagation of the generated waves as they are non-linear and require the application of higher-order terms in the governing equations. The actual generation process in these models is often simplified and tuned to two specific scenarios that can be realized in laboratory experiments: (1) the sliding body is represented by a rigid or (2) a viscous body. In real landslides, the rheology of the sliding body is unknown and varies between these two end-member scenarios. We present new modeling results to gain a better understanding of the relevant parameters affecting the characteristic of generated tsunami waves by landslides. The applicability of the multi-material hydrocode iSALE we used in our models is demonstrated by reproducing experiments conducted with rigid and viscous sliding bodies. Our results provide new insight of the slide dynamics, the coupling between the sliding body and the slope and the water column, repsectively. They confirm the known positive effect of increased velocity and increased volume of the sliding body on the initial wave characteristics. In addtion we have investigated how the rheological properties of the sliding body affect the wave characteristic.
DE: 0545 Modeling (4255)
SC: Seismology [S]
MN: 2007 Fall Meeting