Characteristics and causes of “7·10”super-huge debris flows in Jian River section of Beichuan
Liu Jian, Ge Yonggang, Zhang Jianqiang, Chen Rong
1.Institute of Mountain Hazards and Environment, CAS, Key Laboratory of Mountain Hazards and Land Surface Process, 610041,Chengdu, China; 2.Graduate University of Chinese Academy of Sciences, 100049,Beijing, China
This paper took the “7·10”super-huge debris flows in Jian River section of Beichuan as the research object, analyzed the disaster types, spatial distribution, disaster characteristics, disaster mode and controlling factors. The results showed that: 1) rich provenance and heavy rainfall were the main causes to the disasters which were characterized by clustered spatial distribution and obvious chain effects, and the scales were mainly small or medium; 2) compared with other regions, debris flows had low densities ranging from 1.69 -1.91 g/ cm3, and they were mainly transitional types. The debris flows also had a significant amplification effect, and the rates of flow were 1.9 - 8.5 times that of pre - earthquake. Finally, given the characteristics and failure mode of disasters, some suggestions are proposed in order to relieve mountain hazards.
刘剑1,2, 葛永刚1, 张建强1, 陈容1,2. 北川湔江河段“7·10”特大山洪泥石流灾害特征与成因分析[J]. 中国水土保持科学, 2014, 12(4): 44-50.
Liu Jian, Ge Yonggang, Zhang Jianqiang, Chen Rong. Characteristics and causes of “7·10”super-huge debris flows in Jian River section of Beichuan. SSWCC, 2014, 12(4): 44-50.