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汶川地震导致大量崩塌和滑坡等次生地质灾害,为泥石流发生提供了丰富的物源,强降雨过后,汶川强震区的群发性泥石流出现了高发区。在2008-2010年的三个雨季里,强震区暴发了多处群发性泥石流灾害,龙池所在的龙溪河流域“8·13”群发泥石流灾害就是其中之一。首先对龙池龙溪河流域2010年8月13日暴发的45条泥石流沟进行简单的灾害阐述,其次在调查数据的基础上阐述了群发泥石流的特征:①成因多样,主因为地震和降雨综合的作用;②规模不一,以中小型为主,流体性质多集中为过渡性—粘性;③隐蔽性强,泥石流活动多集中在极小流域,主要为沟谷型泥石流;④泥石流活动集中在断裂带附近;⑤危害方式以冲蚀、淤埋和堵塞河道为主,且具有灾害链作用和叠加-放大作用。最后针对震区群发泥石流的活动特征,提出增强减灾措施的针对性。
The Wenchuan earthquake caused a large number of secondary geological disasters such as landslides and landslides, providing a rich source of debris flow. After the heavy rainfall, the mass debris flow in the Wenchuan strong earthquake zone appeared in a high incidence area. In the three rainy seasons from 2008 to 2010, a large number of massif debris flows broke out in the earthquake area, and the “8.13” massacre in the Longxi River where Longchi was located was one of them. First of all, forty-eight mud-rock ditches on Longxi River Basin in Longchi were dis- cussed on August 13, 2010. Secondly, the characteristics of mass mud-rock flow were expounded on the basis of the survey data. ① The causes were diverse, mainly due to the combination of earthquakes and rainfall ; (2) the scale is different, mainly small and medium-sized, the fluid properties are mostly transitional-viscous; (3) the concealment is strong, the debris flow activities are mostly concentrated in the extremely small watersheds, mainly the valley-type debris flows; (4) the debris flow activities are mainly concentrated in the faults With the vicinity; ⑤ hazards to erosion, silt and clogging river-based, and has the role of disaster chain and superimposed - amplification. Finally, in view of the characteristics of the debris flow in the earthquake zone, it puts forward the pertinence of enhancing the disaster reduction measures.