RS与GIS支持下的汶川县城周边地质灾害危险性评价

地质灾害危险性评价是防灾减灾工作的重要依据。本文以汶川县城周边64 km2为例,应用遥感信息提取技术与GIS空间分析方法,根据IKONOS遥感图像和地形图及野外调查资料,提取了崩塌和滑坡易发性评价因子,采用信息量法确定了因子分值,计算了崩塌和滑坡易发性,并分别提出崩塌和滑坡的危险性计算方法,形成了汶川地区崩塌和滑坡危险性分区图。研究结果表明:新的崩塌和滑坡危险性评价方法能够反映区内地质灾害危险程度,该方法可行,结果合理,这为中、大比例尺区域范围内地质灾害危险性研究提供了有益的思路。

The assessment of geohazard danger in Wenchuan County based on RS and GIS

The assessment of geohazard danger constitutes an important basis for the work of disaster prevention and mitigation.In this paper,the author collected the remote sensing images of IKONOS,topographic maps and field survey data,and extracted the evaluation factors of rock fall and landslide based on remote sensing information extraction technology and GIS Spatial Analysis.Then the factor scores were determined by information method and calculated susceptibility of rock fall and landslide.At last,the new danger calculation method of rock fall and landslide was put forward,and the rock fall hazard zonation map and landslide hazard zonation map were drawn.The results show that the new rock fall and landslide risk assessment method can reflect the risk degree of geological disasters in the study area.The method is feasible and the results are reasonable.This achievement has provided a useful idea for large-scale regional geological hazard study.