Vol14 No.6: 1100-1112
【Title】The formation of the Wulipo landslide and the resulting debris flow in Dujiangyan City, China
【Author】CHEN Xing-zhang1; CUI Yi-fei
【Addresses】1 School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China; 2 Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
【Citation】Chen XZ, Cui YF (2017) The formation of the Wulipo landslide and the resulting debris flow in Dujiangyan City, China. Journal of Mountain Science 14(6). DOI: 10.1007/s11629-017-4392-1
【Abstract】The Wulipo landslide, triggered by heavy rainfall on July 10, 2013, transformed into debris flow, resulted in the destruction of 12 houses, 44 deaths, and 117 missing. Our systematic investigation has led to the following results and to a new understanding about the formation and evolution process of this hazard. The fundamental factors of the formation of the landslide are a high-steep free surface at the front of the slide mass and the sandstone-mudstone mixed stratum structure of the slope. The inducing factor of the landslide is hydrostatic and hydrodynamic pressure change caused by heavy continuous rainfall. The geological mechanical model of the landslide can be summarized as "instability - translational slide - tension fracture - collapse" and the formation mechanism as "translational landslide induced by heavy rainfall". The total volume of the landslide is 124.6×104 m3, and 16.3% of the sliding mass was dropped down from the cliff and transformed into debris flow during the sliding process, which enlarged 46.7% of the original sliding deposit area. The final accumulation area is found to be 9.2×104 m2. The hazard is a typical example of a disaster chain involving landslide and its induced debris flow. The concealment and disaster chain effect is the main reason for the heavy damage. In future risk assessment, it is suggested to enhance the research on potential landslide identification for weakly intercalated slopes. By considering the influence of the behaviors of landslide-induced debris flow, the disaster area could be determined more reasonably.
【Keywords】Landslide; Debris flow; Disaster chain effect; Heavy rainfall; Geological hazard area; Wenchuan earthquake