Numerical and experimental study on the formation mode of a landslide dam and its influence on dam breaching

作者：Zhao, G. -W.; Jiang, Y. -J.^*; Qiao, J. -P.; Yang, Z. -J.; Ding, P. -P.

来源：Bulletin of Engineering Geology and the Environment, 2019, 78(4): 2519-2533.

DOI：10.1007/s10064-018-1255-0

• Landslide
• Landslide dam
• Debris flow
• Overtopping erosion
• Discrete element method

The deposition morphology of a landslide dam determines the position of initial breach and sequentially affects the direction of lateral erosion. Twenty-seven discrete element numerical simulations were carried out to investigate the deposition morphology of landslide dams concerning three factors, which include the valley shape, the valley bed inclination and the landslide velocity. The simulation results show that the valley shape and the landslide velocity affect the dam morphology in both transverse and longitudinal directions, while the valley bed inclination mainly affects the longitudinal morphology of dams. Further, a flume experiment was carried out to investigate the specific effects of the dam morphology on the overtopping erosion of landslide dams. The results of experiment show that for the dams in different deposition morphologies and with different initial breaches, the breach widths and the total sediment discharges induced by overtopping erosion are different.

• 出版日期2019-6
• 单位中国科学院大学; 中国科学院、水利部成都山地灾害与环境研究所