Abstract: As a secondary disaster with great harm, landslide surge poses great threats to people's life and property safety. In the aim of discovering hazards and taking preventive measures, the whole process of landslide surge wave was simulated numerically to explore the characteristics of surge waves in different fields. A numerical model of landslide surge wave was established by CFD Flow-3D. The accuracy and effectiveness of the model were verified by classical landslide surge wave test. The height of the first wave simulated by the numerical simulation was in good agreement with the result of physical model test, implying that the numerical simulation could reflect the whole process of landslide surge wave propagation. Based on the numerical model, 27 groups of numerical simulation tests on landslide density, landslide volume and initial water entry characteristics were developed. Results revealed a negative correlation between the rebound of the near field surge wave and the occurrence time of the first wave trough and the density of the landslide. The first potential energy of the near field surge wave accounts for about 70% of the whole surge potential energy. The period of the far field surge wave is about two times of the underwater movement time of the landslide body. According to the surge potential energy, the initial position of the far field surge wave is 22 meters away from the water entry point of the landslide under certain conditions. The research findings are of referential value for the early warning and prevention of landslide surge disaster in practice.

Key words: landslide surge, field, water waves' features, numerical simulation, FLOW-3D