【作者】 陈莉；

【导师】 陈廷芳；

【作者基本信息】 西南科技大学 ， 地质工程， 2016， 硕士

【副题名】以龙溪河流域为例

【摘要】 都江堰市龙溪河流域处于汶川地震重灾区,地震引发大量的滑坡、泥石流、崩塌等地质灾害。加上强暴雨的作用,又引发大量新增地质灾害,尤其是泥石流灾害,其对交通基础设施损毁巨大,造成部分地区电力、通信中断,直接经济损失高达几亿元。本文针对龙溪河流域做了以下研究:(1)本文在深入学习和研究前人科研成果的基础上,通过对龙溪河流域泥石流的调查,对灾害前后泥石流的分布规律、规模、特征等进行分析,发现龙溪河流域泥石流以中、小规模居多,具有隐蔽性、群发性、链发性、破坏性、类型多样的特点。(2)在前人分析成果的基础上,了解了研究区内泥石流的数量、规模的变化,以及同地层岩性、地质构造等因素的相关性,将研究区划分为极高、高度、中度、低度、微度5个级别,发现高危险区主要集中在八一沟、蒋家沟等区域,而且大多高危险的集水区都主要集中于泥石流沟的上游。(3)通过调查与航片解译相结合的方式,在详细查明龙池镇土地利用现状及居民点等承灾体分布的基础上,对龙溪河流域各类承灾体的暴露性进行了分析,发现龙溪河流域承灾体的暴露性分布以水系为走向,暴露性最低的区域主要为林地和草地等海拔较高区域,易损性最高的是研究区内人口及财产最集中的区域。(4)最后综合危险性、暴露性、易损性分析结果,完成该研究区风险分析。并结合灾后研究区发展规划,对研究区提出了地质灾害防治建议以及初步的防治对策。以期望对灾后恢复重建和保护人民生命财产安全作参考,为研究区综合整治规划提供可靠的基础数据。更多还原

【Abstract】 Longxi river is located in wenchuan earthquake disaster zone, The earthquake caused the large amount of geological disasters such as landslides, debris flows, collapses。Due to the torrential rain, added a lot of geological hazards, especially debris flows。Debris flows destroyed many of the transport infrastructure, and made the parts of the electric power and communication interrupt, Caused direct economic loss of hundreds of millions of dollars. Study Longxi river to do the following:(1)After the study of predecessors’ research results, through the survey of river stream, This paper analyzed the distribution, scale and characteristics of the debris flows before and after the disaster. We found that Longxi river are mainly composed of medium and small-scale Debris flows, with the characteristics of Concealment, clusters, chain, destructive, type, etc.(2)On the basis of previous analysis results, this paper analyses the debris flows quantity, the change of the scale, and the correlation of factors such as stratum lithology, geological structure, The study area is divided into five levels, We found that the high risk areas are mainly concentrated in Bayi river, Jiangjia river, and so on,and most high dangerous watershed are focused on the upstream of debris flows.(3)Combining survey and aerial photo interpretation, on the basis of Hazard Bearing Body distribution such as land use present situation and the residential areas, etc. the Hazard Bearing Body of Longxi river exposure are analyzed, Found that exposure to the Hazard Bearing Body mainly drainage to the distribution,Minimum exposure area mainly for high altitude areas of woodlands and grasslands, Vulnerability of the highest is the study of population in the area and the most concentrated area of properties.(4)Combined with risk, exposure, vulnerability analysis, this paper completed the risk analysis in the study area. After considering the post-disaster development planning in the study area, the geological disaster prevention Suggestions were put forward in the study area, and the preliminary countermeasures. This study expects to post-earthquake recovery and reconstruction and protection of people’s life and property security for reference, providing reliable basis for the comprehensive improvement in the study area planning data.更多还原