Abstract
Abstract. This paper is devoted to benchmarking the Multilayer-HySEA model using laboratory experimental data for landslide-generated tsunamis. This article deals with rigid slides, and the second part, in a companion paper, addresses granular slides. The US National Tsunami Hazard and Mitigation Program (NTHMP) has proposed the experimental data used and established for the NTHMP Landslide Benchmark Workshop, held in January 2017 at Galveston (Texas). The first three benchmark problems proposed in this workshop deal with rigid slides. Rigid slides must be simulated as a moving bottom topography, and, therefore, they must be modeled as a prescribed boundary condition. These three benchmarks are used here to validate the Multilayer-HySEA model. This new HySEA model consists of an efficient hybrid finite-volume–finite-difference implementation on GPU architectures of a non-hydrostatic multilayer model. A brief description of model equations, dispersive properties, and the numerical scheme is included. The benchmarks are described and the numerical results compared against the lab-measured data for each of them. The specific aim is to validate this new code for tsunamis generated by rigid slides. Nevertheless, the overall objective of the current benchmarking effort is to produce a ready-to-use numerical tool for real-world landslide-generated tsunami hazard assessment. This tool has already been used to reproduce the Port Valdez, Alaska, 1964 and Stromboli, Italy, 2002 events.
Highlights
Model development and benchmarking for earthquakeinduced tsunamis is a task addressed in the past and to which much effort and time has been dedicated
Just to mention a couple of National Tsunami Hazard and Mitigation Program (NTHMP) efforts, the 2011 Galveston benchmarking workshop (Horrillo et al, 2015) and the 2015 Portland workshop for tsunami currents (Lynett et al, 2017) both focused on these topics
In its 2019 strategic plan, the NTHMP required that all numerical tsunami inundation models to be used in hazard assessment studies in the United States be verified as accurate and consistent through a model benchmarking process
Summary
Model development and benchmarking for earthquakeinduced tsunamis is a task addressed in the past and to which much effort and time has been dedicated. In its 2019 strategic plan, the NTHMP required that all numerical tsunami inundation models to be used in hazard assessment studies in the United States be verified as accurate and consistent through a model benchmarking process. This mandate was fulfilled in 2011 but only for seismic tsunami sources and to a limited extent for idealized solid underwater landslides. The current work presents the numerical results obtained for the Multilayer-HySEA model in the framework of the validation effort described above for the case of rigid-slide-generated tsunamis, whereas the benchmark problems dealing with granular slides are presented in a companion paper, Macías et al (2021). We would like to stress that the ultimate goal of our current benchmarking effort is to provide the tsunami community with an NTHMP-approved model for landslide-generated tsunami hazard assessment, to what we have done with the Tsunami-HySEA model for the case of earthquake-generated tsunamis (Macías et al, 2017; Macías et al, 2020a, c)
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