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以北川湔江河段2013年“7·10”特大山洪泥石流为研究对象,通过分析研究区山地灾害的类型、空间分布、灾害特征、成灾模式、控制因素等,研究“7·10”特大山洪泥石流灾害特征与成因。结果表明:1)丰富的物源和强降雨是本次群发性山地灾害的主要成因,灾害规模以中小型为主,空间分布表现出一定的群发性,灾害链效应明显;2)与其他地区相比,研究区内泥石流密度较低,分布在1.69~1.91 g/cm3之间,大部分属过渡型泥石流,震后泥石流流量放大效应明显,震后泥石流流量约为震前泥石流流量的1.9~8.5倍。为减轻山地灾害,针对本次灾害特征和破坏模式,提出相应的建议。
Based on the analysis of the type, spatial distribution, disaster characteristics, disaster patterns and control factors of mountain calamities in the Beichuan section of the Beijuan River in 2013, the “7.10” extra-large debris flow was studied. "Characteristics and Causes of Debris Flow Disaster in Extra - large Mountain. The results show that: 1) Rich source and heavy rainfall are the main causes of this massive mountainous disaster. The scale of disaster is dominated by small and medium-sized ones, and the spatial distribution shows a certain mass concentration. The disasters chain effect is obvious. 2) Compared with other regions Compared with the low debris flow density in the study area, distributed between 1.69 and 1.91 g / cm3, most of which are transitional debris flows. After the earthquake, the amplification effect of debris flow is obvious. The debris flow after the earthquake is about 1.9 ~ 8.5 times. In order to alleviate the mountain disaster, we put forward corresponding suggestions according to the disaster characteristics and the destruction mode.