陕西省坪头镇幅地质灾害危险性评价

发布时间：2018-01-23 23:35

本文关键词： 地质灾害危险性改进的统计评价方法模糊综合评判方法 GIS　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：陕西省坪头镇是我国滑坡、崩塌与泥石流等地质灾害多发区域,由于地质条件和气候因素的复杂性,区内地质灾害频发,不仅导致了严重的经济损失,而且对附近居民的生命安全构成了较大的威胁。因此,研究坪头镇幅地质灾害的发生规律及其危险性区划对于提高该区的灾害监测和防治能力具有非常重要的实际意义。本文以陕西省宝鸡市陈仓区坪头镇幅为研究区域,基于ArcGIS软件,采用模糊综合评判方法和改进的统计分析方法进行地质灾害危险性评价,主要成果如下:(1)综合分析区内地质条件、灾害分布规律与发育特征等,确定评价指标体系及其分级标准,并对研究区内各种地质灾害的主控因素进行了相关性统计分析。(2)基于传统的统计分析方法提出了改进的地质灾害危险性区划方法;采用传统和改进的统计分析方法对区内地质灾害进行了危险性评价。(3)基于GIS,采用模糊评判方法,并利用matlab软件和最大隶属度原则计算得出各栅格单元的危险性隶属等级,进而得出研究区内地质灾害的危险性区划结果。(4)对三种评价方法的评价结果进行定性和定量的有效性检验,并且根据危险性区划结果与实际地质灾害点的叠加图以及AUC曲线,对这三种方法的评价结果进行对比分析,结果表明,基于改进的统计分析方法的危险性区划结果更为准确。(5)基于危险性评价结果,结合坪头镇幅的地理及地质特征,将区内地质灾害危险程度划分为高危险性、中危险性、低危险性和不危险性四个级别,从而得到坪头镇幅地质灾害危险性综合区划结果。
[Abstract]:Pingtou Town in Shaanxi Province is prone to landslides, landslides and debris flows. Because of the complexity of geological conditions and climate factors, geological disasters occur frequently in Pingtou town, which not only leads to serious economic losses. And it poses a greater threat to the lives of nearby residents. It is of great practical significance to study the occurrence law and dangerous regionalization of geological hazards in Pingtou area for improving the ability of disaster monitoring and prevention. This paper takes Pingtou Town, Chen Cang District, Baoji City, Shaanxi Province as the research area. Domain. Based on ArcGIS software, fuzzy comprehensive evaluation method and improved statistical analysis method are used to evaluate geological hazard risk. The main results are as follows: 1) Comprehensive analysis of geological conditions in the area. The evaluation index system and its classification standard are determined. The correlation statistical analysis of the main control factors of various geological hazards in the study area is also made. (2) based on the traditional statistical analysis method, an improved method of geological hazard risk regionalization is put forward. The traditional and improved statistical analysis method is used to evaluate the risk of geological hazards in this area. (3) based on GIS-based, fuzzy evaluation method is adopted. By using matlab software and the principle of maximum membership degree, the dangerous membership grade of each grid unit is calculated. The results of risk regionalization of geological hazards in the study area. 4) the evaluation results of the three evaluation methods are tested qualitatively and quantitatively. According to the results of hazard zoning, the superposition map of the actual geological hazard points and the AUC curve, the evaluation results of these three methods are compared and analyzed, and the results show that. The result of risk regionalization based on improved statistical analysis method is more accurate. (5) based on the results of risk assessment, combined with the geographical and geological characteristics of Pingtou block. The dangerous degree of geological hazard in this area is divided into four grades: high risk, middle risk, low risk and no danger, and the result of comprehensive regionalization of geological hazard risk in Pingtou Town is obtained.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P694

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