海螺沟050811特大泥石流灾害及减灾对策

四川省泸定县海螺沟2005年8月11日发生了超过100 a一遇的特大泥石流灾害。这次灾害点多、面广,几乎同时暴发。通过对这次灾害的实地考察,分析了灾害发生的地质、气象、地貌等方面原因。灾害主要原因是特大暴雨激发所致。结合该流域历史的泥石流活动情况,进行了简要的发展趋势分析。针对当地的社会条件和自然条件,提出了防灾、减灾对策,具体分为应急处理措施和后期防治建议。

050811 Large-scale Debris Flow in Hailuo Valley and Prevement Countermeasures

On August 11,2005,an extremely wide debris flow disaster with return period of more than 100 years took place in the Hailuo Valley,Luding County,the east of the Gongga Mountain.After investigation of the disaster, the causes of the disaster occurrence,including geology,relief,climate and human activities,were analyzed.The main cause to the occurrence was the heavy rainstorm.The amount of daily rainfall was over 88 mm on August 12.The trend of debris flow activities was analyzed by referring to historical debris flow.Controlling countermeasures such as emergency measures and upper mitigation measures are presented through comparing the 050811 hazard with other hazards like the debris flow in Xinping County.