Tsunami Squares Approach to Landslide-Generated Waves: Application to Gongjiafang Landslide, Three Gorges Reservoir, China

We have developed a new method, named “Tsunami Squares”, for modeling of landslides and landslide-generated waves. The approach has the advantages of the previous “Tsunami Ball” method, for example, separate, special treatment for dry and wet cells is not needed, but obviates the use of millions of...

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Bibliographic Details
Published in:Pure and applied geophysics 2015-12, Vol.172 (12), p.3639-3654
Main Authors: Xiao, Lili, Ward, Steven N., Wang, Jiajia
Format: Article
Language:English
Subjects:
Canyons
Computer simulation
Earth and Environmental Science
Earth Sciences
Failure
Freshwater
Geophysics/Geodesy
Landslides
Landslides & mudslides
Laptop computers
Mathematical models
Momentum transfer
Reservoirs
Risk
Tsunamis
Water waves
Wave propagation
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Summary:We have developed a new method, named “Tsunami Squares”, for modeling of landslides and landslide-generated waves. The approach has the advantages of the previous “Tsunami Ball” method, for example, separate, special treatment for dry and wet cells is not needed, but obviates the use of millions of individual particles. Simulations now can be expanded to spatial scales not previously possible. The new method accelerates and transports “squares” of material that are fractured into new squares in such a way as to conserve volume and linear momentum. The simulation first generates landslide motion as constrained by direct observation. It then computes induced water waves, given assumptions about energy and momentum transfer. We demonstrated and validated the Tsunami Squares method by modeling the 2008 Three Gorges Reservoir Gongjiafang landslide and river tsunami. The landslide’s progressive failure, the wave generated, and its subsequent propagation and run-up are well reproduced. On a laptop computer Tsunami Square simulations flexibly handle a wide variety of waves and flows, and are excellent techniques for risk estimation.
ISSN:0033-4553
1420-9136
DOI:10.1007/s00024-015-1045-6