Large landslide instability will throw rock and soil into the water, causing massive surge waves, damaging the underwater pipeline structure, and endangering the lives and property of coastal residents. This study uses the RNG turbulence model and the VOF method to numerically simulate the landslide surge based on the physical experiment model. This paper simulated the characteristics of the surge generated by the sliding block entering the water, analyzed the time history changes of the free surface, the factors influencing the surge height, and the flow field characteristics around the pipeline. According to the simulation results, the maximum surge height has a nonlinear increasing law with entry velocity, entry angle, and slider volume and a nonlinear decreasing law with water depth. At the back of the pipeline, the first collision between the forward-advancing surge and the reflected reflux surge will create a collision zone. Until the water surface is stagnant and gone, the collision zone will travel forward due to the rise in reflux water velocity and backwards due to the secondary wave produced by the surge. The simulation results corroborate the findings of physical experiments, which can provide technical assistance in protecting underwater pipelines, ensuring people's livelihoods, and maintaining urban public safety.

中文翻译：

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滑坡涌流传播规律及管道周围流场影响

大型滑坡失稳会将岩土抛入水中，引发巨大浪涌，破坏水下管道结构，危及沿海居民生命财产安全。本研究在物理实验模型的基础上，采用RNG湍流模型和VOF方法对滑坡涌流进行数值模拟。本文模拟了滑块入水时产生的喘振特性，分析了自由液面的时程变化、影响喘振高度的因素以及管道周围的流场特征。仿真结果表明，最大浪涌高度随入水速度、入水角度、滑块体积呈非线性增大规律，随水深呈非线性减小规律。在管道的后部，向前推进的浪涌和反射的回流浪涌之间的第一次碰撞将形成碰撞区。直至水面静止消失，碰撞区将因回流水速的上升而向前移动，并因涌浪产生的二次波而向后移动。模拟结果验证了物理实验结果，可为保护水下管道、保障民生、维护城市公共安全提供技术帮助。