【摘要】 2008年5月12日,中国四川汶川发生里氏8.0级地震,对四川和甘肃的13个县市造成了严重破坏。强烈的主震和余震在地震区造成了大量的滚石、崩塌、滑坡、泥石流、碎屑流等次生山地灾害,大规模滑坡崩塌堵断河道形成堰塞湖,引起山区河流强烈演变。分析了汶川"5.12"地震在四川省境内形成的众多堰塞湖(体)的不同类型、组成特征,提出堰塞体等河道堆积物对河流自然形态、生态环境和人类社会可能存在的影响。针对震后山区河流开发保护与生态环境建设的目标,对堰塞体综合治理提出了具体的指导意见和措施,以便尽可能地避害趋利,有效维护河流的健康。更多还原

【Abstract】 On 12 May 2008,a devastating mega-earthquake of magnitude 8.0 struck the Wenchuan area,northwestern Sichuan province,China.Wenchuan earthquake inevitably impaired the stability of mountains in the course of massive reverse-thrust strike-slip motion in the fault zone.Geohazards were triggered with the types of rock fall,rock avalanches,landslides,debris flows,and earthquake-lakes.In this paper,the types and characteristics of dammed lakes induced by Wenchuan earthquake are analized.The dammed lakes would seriously influence the river sediment transportation,fluvial processes and ecoenvironment.Consequently,the guidline and effective approaches for river restoration of dammed lake are susggested,so as to mitigate hazard loss and make the rivers influenced by the dammed lake serve us better.更多还原