The final aim of the present work is to propose a NTHMP-benchmarked numerical tool for landslide-generated tsunami hazard assessment. To achieve this, the novel Multilayer-HySEA model is validated using laboratory experiment data for landslide-generated tsunamis. In particular, this second part of the work deals with granular slides, while the first part, in a companion paper, considers rigid slides. The experimental data used have been proposed by the US National Tsunami Hazard and Mitigation Program (NTHMP) and were established for the NTHMP Landslide Benchmark Workshop, held in January 2017 at Galveston (Texas). Three of the seven benchmark problems proposed in that workshop dealt with tsunamis generated by rigid slides and are collected in the companion paper (Macías et al., 2021). Another three benchmarks considered tsunamis generated by granular slides. They are the subject of the present study. The seventh benchmark problem proposed the field case of Port Valdez, Alaska, 1964 and can be found in Macías et al. (2017). In order to reproduce the laboratory experiments dealing with granular slides, two models need to be coupled: one for the granular slide and a second one for the water dynamics. The coupled model used consists of a new and efficient hybrid finite-volume–finite-difference implementation on GPU architectures of a non-hydrostatic multilayer model coupled with a Savage–Hutter model. To introduce the multilayer model more fluidly, we first present the equations of the one-layer model, Landslide-HySEA, with both strong and weak couplings between the fluid layer and the granular slide. Then, a brief description of the multilayer model equations and the numerical scheme used is included. The dispersive properties of the multilayer model can be found in the companion paper. Then, results for the three NTHMP benchmark problems dealing with tsunamis generated by granular slides are presented with a description of each benchmark problem.

中文翻译：

---

滑坡产生的海啸的多层-HySEA模型验证–第2部分：颗粒状滑坡

本工作的最终目的是提出一个以NTHMP为基准的数值工具，用于滑坡产生的海啸灾害评估。为了实现这一目标，使用实验室实验数据对滑坡产生的海啸进行了验证，从而验证了新型的Multi-HySEA模型。特别是，该工作的第二部分涉及颗粒状的滑片，而第一部分在随附的论文中考虑了刚性的滑片。所使用的实验数据已由美国国家海啸灾害与缓解计划（NTHMP）提出，并为2017年1月在德克萨斯州加尔维斯顿（Galveston）举行的NTHMP滑坡基准研讨会建立。该研讨会提出的七个基准问题中的三个涉及刚性滑轨产生的海啸，并被收集在同伴论文中 （Macías等人，2021年）。另外三个基准测试被认为是由颗粒状幻灯片产生的海啸。它们是本研究的主题。第七个基准问题提出了1964年阿拉斯加瓦尔迪兹港的现场案例，可以在Macías等人的论文中找到。（2017）。为了重现涉及颗粒状载玻片的实验室实验，需要耦合两种模型：一种模型用于颗粒载玻片，另一种模型用于水动力学。所使用的耦合模型由在非静液压多层模型的GPU架构上与Savage-Hutter模型耦合的GPU架构上的一种新的高效的有限体积-有限差分混合实现组成。为了更流畅地介绍多层模型，我们首先介绍了单层模型Landslide-HySEA的方程，其中流体层与粒状滑动之间存在强耦合和弱耦合。然后，简要介绍了多层模型方程式和所使用的数值方案。多层模型的色散特性可以在随附的论文中找到。然后，