Validation and inter-comparison of models for landslide tsunami generation

This paper incorporates the Bingham rheology model with the Navier–Stokes solver to simulate the tsunamis excited by a slump-type landslide. The slump is modeled as the Bingham material, in which the rheological properties changing from the un-yield phase to yield phase is taken into account. The volume of fluid method is used to track the interfaces between three materials: air, water, and slump. The developed model is validated by the laboratory data of the benchmark landslide tsunami problem. A series of rheological properties analyses is performed to identify the parameter sensitivity to the tsunami generation. The results show that the yield stress plays a more important role than the yield viscosity in terms of the slump kinematics and tsunami generation. Moreover, the scale effect is investigated under the criterion of Froude number similarity and Bingham number similarity. With the same Froude number and Bingham number, the result from the laboratory scale can be applied to the field scale. If the slump material collected in the field is used in the laboratory experiments, only the result of the maximum wave height can be used, and significant errors in slump shape and moving speed are expected.

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Landslide Tsunami Generation Mechanism and its Detection for Early Tsunami Warning

Tsunami Research at the End of a Critical Decade - Advances in Natural and Technological Hazards Research ◽

10.1007/978-94-017-3618-3_16 ◽

2001 ◽

pp. 229-241 ◽

Cited By ~ 1

Author(s):

Sin-Iti Iwasaki ◽

Shoji Sakata

Keyword(s):

Tsunami Warning ◽

Generation Mechanism ◽

Tsunami Generation ◽

Landslide Tsunami

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Faster Than Real Time tsunami simulations – challenges and solutions towards High Performance Exascale Computing

10.5194/egusphere-egu2020-19848 ◽

2020 ◽

Author(s):

Jorge Macias ◽

Manuel J. Castro ◽

Marc de la Asunción ◽

José Manuel González-Vida ◽

Carlos Sánchez-Linares ◽

...

Keyword(s):

Real Time ◽

High Performance ◽

Simulation Models ◽

Early Warning Systems ◽

Tsunami Generation ◽

Tsunami Propagation ◽

Tsunami Early Warning ◽

Horizon 2020 ◽

Landslide Tsunami ◽

Tsunami Early Warning Systems

Tsunami simulation in the framework of Tsunami Early Warning Systems (TEWS) is a quite recent achievement, but still limited regarding the size of the problem and restricted to tsunami wave propagation. Faster Than Real Time (FTRT) tsunami simulations require greatly improved and highly efficient computational methods to achieve extremely fast and effective calculations. HPC facilities have the role to bring this efficiency to a maximum possible and drastically reducing computational times. Putting these two ingredients together is the aim of Pilot Demonstrator 2 (PD2) in ChEESE project. This PD will comprise both earthquake and landslide sources. Earthquake tsunami generation is to an extent simpler than landslide tsunami generation, as landslide generated tsunamis depend on the landslide dynamics which necessitate coupling dynamic landslide simulation models to the tsunami propagation. In both cases, FTRT simulations in several contexts and configurations will be the final aim of this pilot.Among the objectives of our work in ChEESE project are achieving unprecedented FTRT tsunami computations with existing models and investigate the scalability limits of such models; increasing the size of the problems by increasing spatial resolution and/or producing longer simulations while still computing FTRT, dealing with problems and resolutions never done before; developing a TEWS including inundation for a particular target coastal zone, or numerous scenarios allowing PTHA (PD7) and PTF (PD8), an aim unattainable at present or including more physics in shallow water models for taking into account dispersive effects.Up to now, the two European tsunami flagship codes selected by ChESEE project (Tsunami-HySEA and Landslide-HySEA) have been audit and efficiency further improved. The improved code versions have been tested in three European 0-Tier HPC facilities: BSC (Spain), CINECA (Italy) and Piz Daint (Switzerland) using up to 32 NVIDIA Graphic Cards (P100 and V100) for scaling purposes. Computing times have been drastically reduced and a PTF study composed by around 10,000 scenarios (4 nested grids, 12 M cells, 8 hours simulations) have been computed in 6 days of wall-clock computations in the 64 GPUs available for us at the BSC.&#160;Acknowledgements. This research has been partially supported by the Spanish Government Research project MEGAFLOW (RTI2018-096064-B-C21), Universidad de M&#225;laga, Campus de Excelencia Internacional Andaluc&#237;a Tech and ChEESE project (EU Horizon 2020, grant agreement N&#186; 823844), https://cheese-coe.eu/

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Landslide tsunami case studies using a Boussinesq model and a fully nonlinear tsunami generation model

Natural Hazards and Earth System Science ◽

10.5194/nhess-3-391-2003 ◽

2003 ◽

Vol 3 (5) ◽

pp. 391-402 ◽

Cited By ~ 180

Author(s):

P. Watts ◽

S. T. Grilli ◽

J. T. Kirby ◽

G. J. Fryer ◽

D. R. Tappin

Keyword(s):

Case Studies ◽

Papua New Guinea ◽

New Guinea ◽

Marine Geology ◽

Tsunami Generation ◽

Tsunami Propagation ◽

Propagation Models ◽

Fully Nonlinear ◽

Successful Case ◽

Landslide Tsunami

Abstract. Case studies of landslide tsunamis require integration of marine geology data and interpretations into numerical simulations of tsunami attack. Many landslide tsunami generation and propagation models have been proposed in recent time, further motivated by the 1998 Papua New Guinea event. However, few of these models have proven capable of integrating the best available marine geology data and interpretations into successful case studies that reproduce all available tsunami observations and records. We show that nonlinear and dispersive tsunami propagation models may be necessary for many landslide tsunami case studies. GEOWAVE is a comprehensive tsunami simulation model formed in part by combining the Tsunami Open and Progressive Initial Conditions System (TOPICS) with the fully non-linear Boussinesq water wave model FUNWAVE. TOPICS uses curve fits of numerical results from a fully nonlinear potential flow model to provide approximate landslide tsunami sources for tsunami propagation models, based on marine geology data and interpretations. In this work, we validate GEOWAVE with successful case studies of the 1946 Unimak, Alaska, the 1994 Skagway, Alaska, and the 1998 Papua New Guinea events. GEOWAVE simulates accurate runup and inundation at the same time, with no additional user interference or effort, using a slot technique. Wave breaking, if it occurs during shoaling or runup, is also accounted for with a dissipative breaking model acting on the wave front. The success of our case studies depends on the combination of accurate tsunami sources and an advanced tsunami propagation and inundation model.

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A NUMERICAL MODEL FOR THE EFFICIENT SIMULATION OF MULTIPLE LANDSLIDE-TSUNAMI SCENARIOS

Coastal Engineering Proceedings ◽

10.9753/icce.v36v.currents.20 ◽

2020 ◽

pp. 20

Author(s):

Verdiana Iorio ◽

Giorgio Bellotti ◽

Claudia Cecioni ◽

Stephan Grilli

Keyword(s):

Numerical Model ◽

Probabilistic Approach ◽

Coastal Communities ◽

Submarine Landslides ◽

Tsunami Generation ◽

Linear Superposition ◽

Efficient Simulation ◽

Landslide Tsunami ◽

Tsunami Scenarios ◽

Accurate Computations

Submarine landslides can pose serious tsunami hazard to coastal communities, occurring frequently near the coast itself. The properties of the tsunami and the consequent inundation depend on many factors, such as the geometry, the rheology and the kinematic of the landslide and the local bathymetry. However, when evaluating the risk related to landslide tsunamis, it is very difficult to accurately predict all of the above mentioned parameters. It is therefore useful to carry out many simulations of tsunami generation and propagation, with reference to different landslide scenarios, in order to deal with such uncertainties (see for example the probabilistic approach by Grilli et al. 2009). Accurate computations of landslide tsunami generation, propagation, and inundation, however, is computationally expensive, thus limiting the possible maximum number of scenarios. To partially overcome this difficulty, in the present research, a numerical model is proposed that can efficiently compute a large number of tsunami simulations triggered by different landslides. The main goal is to provide a numerical tool that can be used in a Monte Carlo approach framework. Following the study by Ward (2001), we propose a methodology taking advantage of the linear superposition of elementary tsunami solutions.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/uYOvdsutmBw

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On the characteristics of landslide tsunamis

Philosophical Transactions of The Royal Society A Mathematical Physical and Engineering Sciences ◽

10.1098/rsta.2014.0376 ◽

2015 ◽

Vol 373 (2053) ◽

pp. 20140376 ◽

Cited By ~ 74

Author(s):

F. Løvholt ◽

G. Pedersen ◽

C. B. Harbitz ◽

S. Glimsdal ◽

J. Kim

Keyword(s):

Laboratory Experiments ◽

Tsunami Generation ◽

Long Run ◽

Subaerial Landslide ◽

Modelling Techniques ◽

Landslide Deformation ◽

Landslide Tsunami ◽

Weak Influence ◽

Positive Interference ◽

Landslide Tsunamis

This review presents modelling techniques and processes that govern landslide tsunami generation, with emphasis on tsunamis induced by fully submerged landslides. The analysis focuses on a set of representative examples in simplified geometries demonstrating the main kinematic landslide parameters influencing initial tsunami amplitudes and wavelengths. Scaling relations from laboratory experiments for subaerial landslide tsunamis are also briefly reviewed. It is found that the landslide acceleration determines the initial tsunami elevation for translational landslides, while the landslide velocity is more important for impulsive events such as rapid slumps and subaerial landslides. Retrogressive effects stretch the tsunami, and in certain cases produce enlarged amplitudes due to positive interference. In an example involving a deformable landslide, it is found that the landslide deformation has only a weak influence on tsunamigenesis. However, more research is needed to determine how landslide flow processes that involve strong deformation and long run-out determine tsunami generation.

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