Analysis of Movement Process of Landslide in Reservoir and Calculation of Its Initial Surge Height

The movement of landslide in reservoir is divided into two stages, which are movement on ground and movement below water level, and the forcing characteristics of both stages are analyzed in this paper. The Newton law and the basic principles of kinematics are used to solve velocity and acceleration of landslide when it moves on ground surface, and the terminal conditions of stage on ground are considered as the initial conditions of stage below water level. The resistance formula in flow field and viscous force formula are applied to solve velocity and time of landslide when it moves below water level. At last, the momentum theory is adopted to calculate surge height. This paper takes Xintan landslide in the Three Gorges reservoir as the example and takes use of vertical slice method to calculate speed on ground surface, time below water level and surge height of each slice. It comes to the conclusions that the landslide firstly accelerates, then decelerates on surface, and the relationship between time and speed below water level is arc tangent and shows that the surge height keeps a great correlation with the height of slice.