【摘要】 甘沟泥石流位于"5·12"大地震的极重灾区四川省安县,是一条新泥石流沟,震前未发生过泥石流。地震诱发了大量的崩塌、滑坡,提供了丰富的松散固体物质。在降雨影响下,于2009年8月24日,暴发了溃决型泥石流。其主要特征为:①中上游的一个大滑坡是此次暴发泥石流的主要物源;②泥石流的暴发和降水表现出不同步性;③甘沟泥石流为高容重黏性泥石流;④规模大,其流量为403.17m3/s,为溃决型泥石流。研究结果表明了甘沟泥石流已进入一个活跃期,因此,应该尽快对甘沟流域进行风险评估和预警,并采取有效的工程措施。更多还原

【Abstract】 The debris flow was located in Gangou village,Gaochuan township,Anxian County of Sichuan Province in severe earthquake disaster area of "5·12",which was a new debris flow gully,it had not occurred before earthquake.Earthquake induced a mass of disasters as collapse,landslide and provided abundant incompact solid matters.In the rainfall,the bursting debris flow occurred on August 24,2009.The debris flow featured some characters:① the main source of debris flow was the large landslide which was located in the upper and middle reaches;② frequency of debris flow and local precipitation in Gangou was different;③ Gangou belonged to viscous,high-bulk volume debris flow;④ It was the large scale of outburst debris flow with flux about 403.17m3/s.The study indicated that the region had entered an active period by the Gangou debris flow.Therefore,it was important to assess debris flow risk and early warning and effective engineering measures in the Gangou basin areas as soon as possible.更多还原