Landslide-induced waves are one of the most disastrous hazards that can post a great threat to human lives and properties. At about 4:00 pm, 5 November 2017, a landslide-induced tsunami-like wave suddenly occurred across the Truong river in Bac Tra My District, Quang Nam province, Vietnam. The water wave destroyed six houses at the opposite bank and caused one person dead and three others injured. This study seeks to investigate the initiation mechanism and process of the landslide and its impulse wave. First, we examined landslide characteristics through site investigations, unmanned aerial vehicle (UAV) surveys, and laboratory testing with a series of standard geotechnical tests on collected soil samples. Then, the initiation and motion of the rainfall-induced landslides were reproduced by the integrated landslide simulation model (LS-RAPID). Finally, a combined computer simulation of the landslide motion and its impulse wave was performed by using a landslide-induced tsunami simulation model (LS-Tsunami). In which, output data from the LS-RAPID was used as input parameters for LS-Tsunami. The analysis shows that the rainfall with very high intensity in a short-time period was the triggering factor of the landslide, which is common factor in the study area. The 12-, 24-, and 48-h accumulative precipitation prior to the landslide recorded to 530, 760, and 950 mm, respectively. In addition, the rainfall trigger presented a typical pattern of rainstorm events in a long duration. Simulation results show that the impulse wave was generated by the landslide mass rapidly entering the river, crossing the river, and directly causing the disastrous damage to the resident area opposite site of the fail slope. The landslide moved down at a maximum speed of 16.4 m/s when its body approached the water surface and generated a maximum wave height of 5 m. There is good agreement between the observed geomorphic evidences and water traces on the site and simulation results of the landslide and its impulse wave. The paper provides a good case study on the understanding of the mechanism and dynamic process of the whole event that significantly contribute to potential landslide hazard assessment and future disaster mitigation in the area.

中文翻译：

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越南广南省长河山体滑坡诱发海啸样波的分析与建模

滑坡引发的波浪是最灾难性的灾害之一，可能对人类生命和财产构成巨大威胁。2017 年 11 月 5 日下午 4:00 左右，越南广南省 Bac Tra My 区的 Truong 河突然发生山体滑坡引发的海啸般的波浪。水浪冲毁了对岸的6栋房屋，造成1人死亡、3人受伤。本研究旨在探讨滑坡及其冲击波的引发机制和过程。首先，我们通过现场调查、无人机 (UAV) 调查和实验室测试以及对收集的土壤样本进行的一系列标准岩土工程测试来检查滑坡特征。然后，通过综合滑坡模拟模型（LS-RAPID）再现了降雨诱发滑坡的发生和运动。最后，利用滑坡诱发海啸模拟模型 (LS-Tsunami) 对滑坡运动及其冲击波进行了组合计算机模拟。其中，LS-RAPID 的输出数据被用作 LS-Tsunami 的输入参数。分析表明，短时间段内强度极高的降雨是滑坡的触发因素，是研究区普遍存在的滑坡因素。滑坡前 12、24 和 48 小时的累积降水量分别记录为 530、760 和 950 毫米。此外，降雨触发呈现出典型的长期暴雨事件模式。模拟结果表明，冲击波是由滑坡体快速入河、过河、并直接对崩塌坡址对面的居民区造成灾难性的破坏。滑坡体在接近水面时以16.4 m/s的最大速度向下移动，产生的最大波高为5 m。现场观测的地貌证据和水迹与滑坡及其冲击波的模拟结果吻合较好。本文提供了一个很好的案例研究，以了解整个事件的机制和动态过程，这对潜在的滑坡灾害评估和该地区未来的减灾具有重要意义。现场观测的地貌证据和水迹与滑坡及其冲击波的模拟结果吻合较好。该论文提供了一个很好的案例研究，以了解整个事件的机制和动态过程，这对于该地区潜在的滑坡灾害评估和未来的减灾具有重要意义。现场观测的地貌证据和水迹与滑坡及其冲击波的模拟结果吻合较好。该论文提供了一个很好的案例研究，以了解整个事件的机制和动态过程，这对于该地区潜在的滑坡灾害评估和未来的减灾具有重要意义。