摘要
我国东南地区植被发育,地质灾害发育规模小,以浅层的残坡积层滑坡为主,采用传统遥感解译方法识别此类地质灾害存在困难。为提高东南地区地质灾害野外调查的工作效率和正确性,提出了隐性滑坡遥感解译技术方法,其解译的直接目标不是地质灾害体本身,而是隐性滑坡,即地质灾害易发的边坡或斜坡。其技术路线包括:遥感解译GIS工作环境创建、易发程度初步分析、建立解译规则、确定解译点位和解译区段及划定重点调查区等内容。该方法在淳安县1:50000农村山区地质灾害详细调查工作中进行了实际应用,采用0.5m和1.0m分辨率的航片和5m×5m分辨率的DEM数据,基于ArcG IS平台创建了解译环境,共确定解译点位3025个和解译区段969个,划定重点调查区面积约914.18km2。经过野外实地调查,共确定地质灾害隐患和不稳定斜坡283处,其中位于解译区段内的隐患或者不稳定斜坡共计199处,占总数的70.3%;位于重点调查区内的隐患或者不稳定斜坡共计264处,占总数的93.3%。ROC计算结果表明隐性滑坡遥感解译的正确率为92.9%。野外调查及验证结果说明,隐性滑坡遥感解译技术方法能够合理地划定解译区段和重点调查区范围,从而有效地指导野外调查工作,该成果可为我国东南沿海地区如浙江省等地区的大比例尺地质灾害详细调查提供参考。
The traditional remote sensing interpretation technique is hard to recognize the geohazard directly in southeast China where the shallow geohazards are dominated.It is because of low level of vegetation and geohazard development regularity.A method of implicit geohazard remote sensing interpretation was proposed to support the geohazard detailed survey with the purpose of improving its efficiency and accuracy.The proposed method aimed to interpret the slopes where the geohzard is prone to occurrence （named as implicit geohazard）,instead of the geohazard directly.It included the steps of establishing GIS-based working environment,preliminary susceptibility analysis,construction of interoperation rules,determination of interoperation points,zones and important survey regions,and field survey and result verification.The proposed method was applied into a real-world study case of geohazard detailed survey in Chun＇ an county with the scale of 1：50000.The working environment of remote sensing interpretation was established based on ArcGIS.By using the remote sensing images of 0.5m and 1.0m resolution and DEM data with the scale of 1：10000,totally 3025 points and 969 zones were determined.The area of the important survey region was 914.18 km2.The results from the field survey showed that the numbers of geohazard and unstable slope within the interpretation zones and important survey regions were 199 （i.e.70.3%） and 264 （i.e.93.3%）,respectively,out of totally 283 points.The success rate of remote sensing interpretation is 92.9%.This study revealed that the proposed implicit geohazard remote sensing interpretation method could rigorously delineate the interpretation zones and important survey regions and thus could guide the detailed survey effectively.It also shed some lights on applying the proposed method into large-scale geohazard detailed survey in southeast China （e.g.Zhejiang province）.
出处
《地质论评》
CAS
CSCD
北大核心
2014年第6期1370-1380,共11页
Geological Review
基金
国土资源部公益性行业科研专项"突发地质灾害应急响应支撑关键技术研究(编号201211055)"
浙江省国土资源厅"淳安县农村山区地质灾害调查评价"和"浙江省乡镇突发地质灾害风险评价"项目的成果
关键词
地质灾害
隐性滑坡
遥感解译
东南地区
详细调查
GIS
geohazard
implicit landslide
remote sensing interpretation
southeast China
detailed survey
GIS
