Forecasting the Landslide Blocking River Process and Cascading Dam Breach Flood Propagation by an Integrated Numerical Approach: A Reservoir Area Case Study

This paper aims to introduce a numerical technique for forecasting the hazard caused by disaster chain of landslide blocking river-dam breach floods through an integration distinct element method (DEM) and well-balanced finite volume type shallow water model (SFLOW). A toppling slope in reservoir area, southeastern Tibetan Plateau, was chosen study. Creep has been observed potential instability possible sliding surface identified based on data collected from adits boreholes. Catastrophic rock avalanches may be triggered after impoundment, associated needed predicted. First, river process modeled DEM using three-dimensional particle flow code (PFC 3D). The duration, runout distance, kinematic characteristics were obtained. In addition, dam barrier lake constructed. Then, cascading flood propagation simulated self-developed SFLOW. velocity, inundation depth, area maps derived combined provided quantitative reference risk mitigation. influences two involved parameters final hazard-affected are discussed herein. It is expected that presented will applied more prediction cases.