四川省都江堰市大干沟地震泥石流

Study on Earthquake Debris Flow in Dagan Gully,Dujiangyan,Sichuan

2009-07-17,四川省都江堰市虹口乡大干沟在强降雨作用下发生滑坡堵塞沟道,在强大洪水作用下堵塞体溃决,暴发泥石流,造成2人失踪、大量农田被毁等严重灾害。这是汶川"5.12"地震引起大干沟内山体松动,在后期降雨作用下形成的泥石流,是典型的地震泥石流。这种后发型地震泥石流暴发具有一定隐蔽性,不易被察觉。大干沟在强降雨下很有可能再次暴发较大规模的泥石流,并堵塞白沙河、危害公路。

A catastrophic debris flow occurred in Dagan Gully,Hongkou,Dujiangyan,Sichuan Province on July 17,2009.The debris flow caused 2 persons disappearance,and plenty of farmland were covered by sediment.Landslides were triggered by heavy rainfall and blocked the channel.Strong flood made the dam-break and formed the debris flow.The Wenchuan Earthquake made the land lost part of stability.The debris flow in Dagan Gully on July 17,2009 is a typical earthquake debris flow.This kind of debris flow is more dangerous as it is difficult to be distinguished.It is likely triggered a large-scale debris flow by heavy rainfall in this gully in the future.The debris flow will block Baisha River and destroy the highway.