遥感技术在图们地区地质灾害危险性评价中的应用

图们市是地质灾害多发地区,这些地质灾害具有密集性、易发性、群发性和重复性的特点,对当地人民生命财产安全构成威胁,更制约着当地社会经济可持续发展。本次研究以2005年SPOT-5影像、2015年GF-2影像为数据源,选取地貌、岩土体类型、地质灾害点密度、地质构造、森林覆盖率、降雨量和人类工程活动7个评价因子,采用网格分析法获取各因子的量化分级图。通过Arc GIS的栅格计算功能,将各因子加权叠加获取危险性指数分布图,再通过surfer重分类生成研究区地质灾害危险性区划图。研究表明,图们市地质灾害危险性程度以轻度和微度为主,重度和中度区主要集中在重要交通干线和居民集中生活区,应加强危险性重度和中度区的地质灾害监测和排查工作。

Based on Remote Sensing Technique in Geological Hazards Risk Assessment in Tumen Area

Tumen City is a geological hazards -prone area, with intensive, susceptibility, mass and repeatability characteristics .The geological hazards not only pose a threat to the safety of the local people ' s life and property , but also restrict the sustainable develop-ment of the local social and economic .Using the SPOT-5 satellite images of 2005 , GF-2 satellite images of 2015 as data sources , the paper selected seven assessment factors -topography , the types of the rock and the soil , the density of the geological hazards , geo-logical fault, forest coverage, rainfall amount and annual engineering activities , apply the method of grid analysis to achieve the each factor quantitative classification diagram .Though the raster calculation function of ArcGIS , we overlay each factor which is weighted by weight value to create the hazard index maps , and finally generate the geological hazard risk zoning map of Tumen Area by the re -classification of surfer 11 .The results show that , the level of Tumen area ' s geological hazard mainly is mild and slight , the serious and moderate area mainly concentrate on the important transportation routes and residents living area .Therefore, the government should strengthen the work of the geological hazards monitoring and investigation on the serious and moderate risk areas .