摘要
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 secondary disasters of landslide and collapse in Wenchuan Earthquake provide rich sources for debris flow.The occurrence of group debris flow is frequent in the disaster area during the heavy rainfall after the earthquake.In the rainy seasons of 2008,2009 and 2010,meizoseismal areas have breakout mass of group debris flow disasters.esp.group debris flow hazards in Longchi,Dujiangyan,Sichuan Province is one of these disasters.Based on field investigation and analysis,the disasters of 45 debris flow of Longchi in Longxi river basin disasters were firstly elaborated.Then,the relevant characteristics of group debris flow were studied as：（ 1） Various reasons,Mainly because of the comprehensive effect of earthquake and rainfall;（ 2） Different scales,Mostly are small and medium types,Most of debris flows are sub-viscous and viscous debris flows;（ 3） Most catchments of debris flow were small catchment and gully debris flow;（ 4） Most debris flows are distribution in the triggering belt of Wenchuan Earthquake;（ 5） The damageable patterns mainly are erosion,deposition and damming river,have hazard chain and stack-amplification effect.Finally,we proposed the strategies for mitigation of group debris flow,including regular monitoring and warning system.
出处
《灾害学》
CSCD
北大核心
2014年第3期218-223,共6页
Journal of Catastrophology
基金
国家自然科学基金资助项目(40871054)
四川省教育厅科研基金(14ZB0354)
