基于灾害熵的汶川震后道路泥石流敏感性分析

发布时间：2018-03-24 05:38

本文选题：岩土工程　切入点：泥石流　出处：《重庆交通大学学报(自然科学版)》2017年05期

【摘要】：2008年汶川8.0级地震释放的巨大能量导致震区地表岩体产生了强烈的扰动和破坏,许多震前非泥石流沟转化为大规模高频泥石流沟。鉴于震区近年来频发的泥石流灾情,以汶川主要公路沿线(都汶公路和省道303)泥石流沟为研究对象,依据震后泥石流形成条件与活动特征,遴选出影响泥石流发生的关键因子,运用灾害熵理论模型,考虑因子相互之间的影响,计算各个因子的权重,对研究区泥石流进行敏感性区划。分析结果表明:较高敏感性的泥石流沟谷多达47条,占总数的78.3%,且集中分布在中央断裂的上盘,特别是以映秀为暴雨中心的峡谷地带。分析结果可作为震区泥石流防治,灾区重建的理论依据。
[Abstract]:The huge energy released by the 2008 Wenchuan M8.0 earthquake resulted in strong disturbance and destruction of the surface rock mass in the earthquake area, and many non-debris flow gullies were converted into large-scale high-frequency debris flow trenches before the earthquake. In view of the frequent debris flow disasters in the earthquake area in recent years, Taking the debris flow gullies along the main roads of Wenchuan (Duwen Highway and Provincial Highway 303) as the research object, according to the formation conditions and activity characteristics of debris flow after the earthquake, the key factors affecting the occurrence of debris flow are selected, and the disaster entropy theory model is used. Considering the influence of factors on each other, the weight of each factor is calculated, and the sensitivity zoning of debris flow in the study area is carried out. The results show that there are as many as 47 debris flow gullies with high sensitivity. It accounts for 78.3% of the total and is concentrated in the upper disk of the central fault, especially in the gorge zone where Yingxiu is the center of the rainstorm. The results of the analysis can be used as the theoretical basis for the prevention and control of debris flow in the earthquake area and the reconstruction of the disaster area.
【作者单位】：重庆交通大学水利水运工程教育部重点实验室;重庆交通大学岩土工程研究所;中国科学院成都山地灾害与环境研究所中国科学院山地灾害与地表过程重点实验室;
【基金】：国家自然科学基金青年基金资助项目(41601565) 2016年度重庆高校创新团队建设计划资助项目(CXTDG201602012) 重庆科委基础与前沿研究资助项目(cstc2013jcyjA30014)
【分类号】：P642.23;U418.56

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