Abstract: Landslide surge is one of the most common natural disasters in reservoir area. In order to simulate the disaster range of landslide surge more accurately and efficiently, we established a dynamic model of landslide surge based on SASSA landslide motion model, COMCOT tsunami model and its open source finite difference program. The model considers the strong coupling force of landslide surge, the wave breaking and other factors that affect the movement of landslide surge to better reflect the actual movement of landslide surge. The validity of the model is verified by the case study of the landslide surge in Gongjiafang. The simulation results show that: 1) the movement process of landslide, the shape of accumulation, the generation, propagation and climbing of the surge obtained from the simulation are in good agreement with field monitoring; 2) the wave height of the surge on the bank is higher than that in the river due to the wave energy accumulation on the bank; 3) the wave height on slope decreases and fluctuates along the way, which is dependent on the specific topography of monitoring point. Because the simulation results are consistent with the field observation, the model can be applied to the simulate the surge of fluid-like landslide.The simulation results of the model can provide a reference for the prevention and control of the surge disaster of fluid like landslide.

Key words: fluid-like landslide, landslide surge, dynamic model, finite difference method, coupling force, wave breaking