四川省都江堰龙池甘沟泥石流特征及危险性分析

Risk analysis and features of Gangou' debris flow,in Longchi,Dujiangyan of Sichuan Province

甘沟位于都江堰市龙池乡,5.12地震使沟内增加了大量松散物源。2008年9月甘沟发生泥石流,沟口的个别居民点被摧毁;因沟内物源未被全部带走,沟口的公路及居民点仍受泥石流的威胁。本文采用单沟泥石流危险性评价方法,结合现场勘察,对甘沟泥石流形成条件、类型、发育特点、危险性进行分析,结果显示该沟属于中型、低频、中等易发、沟谷型泥石流,对沟口公路影响大,对紫坪铺库区仅为淤积。

Gangou debris flow is located in Longchi,Dujiangyan,Sichuan province.The loose material sources was sharply increasing in valley after the May.12 earthquake.In september 2008,Gangou’s debris flow occurred,roads and settlements were threatened.The paper combines image explanation of remote sensing with spot field investigation to analyze the formative conditions,types,fatalness of the debris flow.In connection with the occurred characteristics of debris flow,the engineering effects are analyzed.The results showed that Gangou’s debris flow is a medium-size,low frequency,medium easy-happening,which threat the road nearly Gangou and only a little of silt at the Zipingpu Reservoir.