The sediment volume of deep-seated landslide and debris flows triggered by torrential rains often causes loss of lives and property in mountainous areas. For the purpose of understanding the characteristics of rapid
mass movement on a watershed scale, this study utilized micro-photography interpretation based on the LiDAR scanning technique to determine unstable landslide zonation. In addition to multi-temporal satellite image interpretation and field investigation, the rapid mass movement process in a gravity deformation area was simulated by adopting the Voellmy-Salm model (RAMMS). The hydrograph variation in a catchment basin is introduced to investigate the detailed dynamic transportation behavior of debris flow such as super-elevation in a curve channel and alluvial fan formation in a valley. Finally, a hazard matrix concept is also proposed to classify the Debris flow hazard. The corresponding
results may contribute to identifying the potential influence areas of sediment-disasters in the future.
Key Words : Landslide, debris flow, LiDAR, micro-photography interpretation, RAMMS.