基于格网GIS的地质灾害地形因子危险评估方法

针对地质灾害的复杂性和不确定性,利用格网GIS技术和数学算法对地质灾害的地形危险进行评估研究。以新源县为实验区,创建500m×500m的格网覆盖研究区,选取高程、坡度、岩性、断层等地质地貌条件作为评价因子,运用GIS统计分析、叠置分析等功能将指标格网化和标准化,最后运用熵值法确定权重,进行综合评估。实验结果表明,新源县较高危险和高危险区主要集中在北部、中部及西南部的山区,共包含90.17%的灾害点,表明将格网GIS技术应用到地质灾害危险评估具有一定的实践意义。

Risk assessment of terrain factors for geological disaster based on Grid GIS

According to the complexity and uncertainty of geological disasters ,it evaluates the terrain factors for geological disaster using the Grid GIS technology and mathematical algorithm .Based on Xinyuan County as an experimental area in Xinjiang ,this paper will create 500 × 500 m grid covering the study area regarding elevation ,slope ,lithology ,geological landform condition as evaluation factors ,and then use the functions of GIS such as statistical analysis and overlay analysis to get the grid and standardization data . Finally the entropy method is used to determine the weight so as to make a comprehensive evaluation .The experimental results show that higher and highest risk areas w hich contain 90.17% of the disaster points are mainly concentrated in the northern ,central and south-western mountainous .So the application of GIS technology to the grid geological hazard assessment has practical significance .