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2012年6月28日四川省凉山州宁南县白鹤滩镇矮子沟发生特大泥石流灾害,泥石流冲毁白鹤滩镇的一家酒楼,造成40人死亡失踪。经过现场调查,沟道内丰富的物源物质以及6月27日晚的局地强降雨是本次泥石流灾害发生的主要原因,同时确定了本次泥石流具有物源区与流通区相叠加的特征。通过现场取样分析计算获得本次泥石流的容重为1.71g/cm3,属稀性泥石流;利用泥石流弯道超高计算公式反算获得本次泥石流的流速约为7.4m/s,并由此计算出泥石流的整体冲击力。由于目前沟内还存在有大量潜在物源,因此建议采用一定的拦挡工程,同时加强汛期排查值守,完善预警预报制度,以防止类似悲剧再次发生。
June 28, 2012 Great debris flow disaster occurred in Dizizigou, Baihetan Town, Ningnan County, Liangshan Prefecture, Sichuan Province. A debris flow destroyed a restaurant in Baihetan Town, killing 40 people. After on-site investigation, the abundant source material in the channel and the heavy rainfall at the local site on the evening of June 27 are the main causes of this debris flow disaster. At the same time, it is confirmed that this debris flow has the characteristics that the source area and the circulation area are superimposed. Through the field sampling analysis and calculation, the bulk density of this debris flow is 1.71 g / cm3, which belongs to the dilute debris flow. The flow velocity of this debris flow is calculated to be about 7.4 m / s by using the ultra-high calculation formula of the debris flow curve. The overall impact of debris flow. Since there are still a large number of potential sources of ditch at present, it is proposed to adopt a certain blockage project while strengthening the investigation and observation of the flood season and improving the early warning and forecasting system so as to prevent the recurrence of similar tragedies.