Numerical Simulation Study On The Landslide Surge Of The River-channel Type Reservoir In Mountain Area

Large landslide surge is a serious threat to the lives and properties of these residents along the coast, and a huge surge can capsize these ships on the river, even affect the stability of the dam. Therefore, the study on the formation and propagation of landslide surge can provide a scientific basis for people to prevent surge disasters.This paper established the two-dimensional mathematical model of the physical model experiment was finished by Monaghan and Kos(2000), which describes the process of a rigid body falls into the water by the finite volume method in FLUENT. VOF method and PISO algorithm are adapted in the iterative calculations. The difference between the numerical results and the previous physical model experiment results are satisfactory. Therefore, the mathematical model can simulate the surge and its propagation process effectively. And it is feasible to apply VOF method to track the free surface of the liquid.Based on the numerical model of a vertical block falls into water, this paper established the simplified two-dimensional numerical mode for the physical model experiment of landslide surge of the river-channel type reservoir in mountain area. Analysis of numerical simulation data and physical model test data shows this two-dimensional numerical model can simulate the process of sliding body with a certain slope sliding into water and producing surge well. This paper has analysed the law of surge height with various factors in FLUENT, such as sliding velocity and the slide volume, water depth. In case of a single factor change, increase or decrease of sliding velocity and the slide volume can bring increase or decrease of surge height. But the surge height shows a decreasing trend with the increase of water depth. This paper has calculated the initial surge height for the Ji’Pazi Landslide via FLUENT. It provides a method to prevent landslide disaster scientifically.