Assessment of movement and deposition for a potential landslide in Lushan area, central Taiwan by 3D discrete element simulation
Date Issued
2012
Date
2012
Author(s)
Lu, Chiao-Yin
Abstract
Landslide is a pestilent natural disaster in many countries around the world. Due to the subtropical climate with annual average four typhoons, combined with frequent earthquakes facilitate to the gravitational sliding in Taiwan. The potential Lushan landslide area is located at a famous hot spring district of Nantou County in central Taiwan which slides frequently due to heavy rainfall. Lushan landslide area demonstrates a possible deep-seated (up to 108 meters) creep along a dip-slope direction with high dip angle. In this study, we simulate the possible scenarios of catastrophic landslide, kinematic process and the assessment of impact area by 3D Particle Flow Code (PFC3D), which is conducted by the three dimension granular discrete element method. The sliding surface is extrapolated by the results of inclinometer and Time Domain Reflectometer (TDR) monitoring systems. Considering the complex geological background of possible different sliding surfaces to estimate the impact area after landslide for pre-landslide scenario simulations, we performed numerical experiments with different boundary conditions and parameters. From our numerical experiments, the Lushan hot spring district is predicted to be covered in 20 seconds except some buildings on the eastern side, where still be menaced by avalanche lakes including the secure refuge of Lushan hot spring district. The predicted maximum velocity is about 35 - 55 m/s and destroy an area about 40 - 50 hectares. The deformation tendency of models without lower sliding surface is similar to the records of inclinometers. From the simulations, when sliding surface extending to the lower slope, that may cause catastrophic disaster in the future. The numerical results of this study will suggest important assessment of movement and deposition for potential landslide cases and landslide susceptibility mapping.
Subjects
Landslide
Lushan
Scenario simulation
PFC3D
Susceptibility map
SDGs
Type
thesis
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