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以地质灾害调查数据为基础,基于大量的野外考察、多源遥感影像解译,获取了899处次生地质灾害点。选取地形、地质、地震、气象水文和人类活动等5类共9项指标,利用GIS技术对地质灾害和各因子的空间分布规律进行了统计分析,并基于K-prototypes聚类分析和最大似然分类法对灾区次生灾害的危险性进行分区和评价。结果表明:灾区地质灾害因类型而异,呈间断性集中分布;灾害危险性以中、高和极高危险为主,分别占总面积的35.10%、21.67%和24.38%,而极低和低危险区共占18.85%;灾害点的空间分布与灾害的危险性等级具有良好的正相关性,直接验证了危险性分区的结果。
Based on the survey data of geological disasters, based on a large number of field investigations and multi-source remote sensing image interpretation, 899 secondary geological disaster points were obtained. Nine indexes of 5 kinds including topography, geology, earthquake, meteorology, hydrology and human activities were selected, and the spatial distribution regularity of geological disasters and various factors were analyzed by using GIS technology. Based on K-prototypes clustering analysis and maximum likelihood Taxonomy zoning and evaluation of the risk of secondary disasters in disaster areas. The results show that the geological disasters in disaster-stricken areas are intermittent and concentrated distributed according to their types. The hazard of disasters is mainly medium, high and extremely high, accounting for 35.10%, 21.67% and 24.38% of the total area respectively, while the extremely low and low 18.85% of them are in danger zone. The spatial distribution of disaster points has a positive correlation with the hazard level of disaster, which directly verifies the result of dangerous zoning.