NUMERICAL SIMULATION OF THE CHARACTERISTICS OF DEBRIS FLOW FROM A TAILING POND DAM BREAK

The debris flow induced by a tailing pond dam break can cause huge hazards to downstream areas, so the study of the characteristics of debris flow is very important. Based on a 3D numerical model, this thesis simulates the flow characteristics of debris after a dam break, and shows the influence of various parameters on debris flow by comparing its data under different dynamic viscosities, height of the dam break and gradients of the flow area. The dynamic viscosity has a significant effect on debris flow. The larger the dynamic viscosity is, the smaller the moving distance is; the larger the dynamic viscosity is, the thicker the debris flow is. The height of dam break has an influence on the debris flow. The higher the dam break is, the longer the distance is which the debris moves. The height of the dam break has little effect on the thickness of debris flow. The gradient of the flow area has a significant effect on debris flow. The larger the gradient of flow area is, the longer the distance is which the debris moves; and the larger the gradient of running area is, the thinner the debris flow is.