九龙县大沟泥石流动力学特征及危险性评价分析

摘要

Dagou locates in the right bank of the reservoir area of Xigu Hydropower Station in Jiulong County of Sichuan Province.In 1998,viscous transitional debris flow occurred after steep slope collapsed,which caused geological hazard for sediments were not rushed off but accumulated in the forming area and circulating area.Based on field survey,the causes and dynamic characteristics of Dagou debris flow are analyzed and its risk is evaluated.The results show that the physical feature,material factor and rainfall factor satisfy all forming conditions of debris flow in Dagou.Meanwhile,Dagou debris flow is of high risk and its development trend has been accelerated.Therefore,it is recommended to take measures to prevent debris flow for safety.%大沟位于四川省九龙县溪古水电站库区右岸,1998年形成区陡坡坍滑后发生了一次粘性-过渡性泥石流,物质堆积在形成区和流通区内没有冲出沟口造成地质灾害。在现场勘察调查的基础上,对大沟泥石流的成因和动力学特征作了分析计算,并对其危险性做了评价。大沟的地势、物源与水源条件均满足泥石流的形成条件,且条件充分。同时其危险程度高,有进一步发展趋势,建议采取措施予以防治,以策安全。