信息量模型在山地环境地质灾害危险性评价中的应用——以四川泸定县为例

Application of information quantity model to hazard evaluation of geological disaster in mountainous region environment: a case study of Luding County,Sichuan Province

以地处青藏高原和四川盆地过渡地带的泸定县为研究区域,选取坡度、地形起伏度、工程地质岩组、与断层距离、与水系距离和土地利用/覆被作为地质灾害的影响因子,利用GIS技术和信息量模型计算了研究区的地质灾害危险性,将获得的综合信息量图划分为:极高度、高度、中度、低度和极低度5级危险区。结果表明,地质灾害主要沿河谷地区呈条带状集中分布,并且具有与构造带、地震活动带展布相一致的特点,灾害点的分布与危险度分区具有很好的相关性,运用信息量法进行地质灾害危险性分区具有较好的客观性,能为区内的地质灾害防治提供参考依据。

This paper evaluated the geological disaster hazard of Luding county,a county located in the transition region of Tibet Plateau and Sichuan Basin,based on GIS technology and information quantity model. Evaluation factors included slope,topographic relief degree,distance from the fault and the river system,engineering geological petrofabric and land use / cover types. According to the comprehensive information quantity,the geological disaster hazard can be divided into five levels: very high,high,moderate,low and very low. Results show that the geological hazards of Luding county concentrated mainly along the zonal river valley,which are consistent with the distribution of tectonic belt and seismic active zone. The number of geological hazard sites is positively correlated with risk levels. The study show that information quantity method is objective and can provide valid basis for geological disaster prevention of the research area.