基于GIS的信息量模型的白沙河流域滑坡危险性评价

摘要

The hazard of landslide of Baishahe basin in Dujiangyan was assessed,and five evaluation factors:land use type,lithology,elevation,slope and aspect were determined.The problem of the quantitative of qualitative factors in the evaluation process was solved through combining the information value model with GIS technology.Finally,the map of study area was divided into 20.0％ high-hazard area,31.0％ medium-hazard area,26.4％ low-hazard area and 22.6％ lower-hazard area with natural breakpoint method.They are in line with the actual results,which indicate that GIS and information value model are both scientific and feasible to landslide hazard evaluation.%以白沙河流域为例进行了滑坡地质灾害危险性评价.选取土地利用类型、岩性、高程、坡度和坡向5个评价因子,建立了基于GIS的信息量模型,解决了存在于评价过程中定性因素定量化处理不够客观的问题.用自然断点法将结果划分成20.0％的高危险区、31.0％的中危险区、26.4％的低危险区以及22.6％的极低危险区.经过验证得到实际滑坡危险性程度与评价结果基本相符,表明将GIS与信息量模型用于滑坡灾害危险性评价是可行的.