基于确定性系数分析方法的秭归县滑坡易发性评价

Evaluation of landslide susceptibility in Zigui County based on certainty factor method

滑坡易发性研究对地质灾害的防治工作具有重要意义。以三峡库区秭归县为研究区域,选取坡度、高程、岩性、土地利用、距水系距离等滑坡因子,采用确定性系数方法分析了滑坡关于各影响因子的易发程度。在此基础上进行了滑坡易发性评价与制图,根据自然间距分类方法将评价结果分为极低、低、中、高和极高5个等级,它们依次占研究区域面积的8.80%,18.89%,25.62%,25.07%和21.62%。评价结果表明,极高和高易发区主要分布于长江干流与支流两岸,与实际分布情况吻合,研究结果对防灾减灾工作具有实用意义。

Landslide susceptibility research is of great significance to geological disasters prevention and treatment.Taking Zigui County as a study area,and considering landslide factors including slope,elevation,lithology,land use and distance from drainage,the impact factors of landslide susceptibility was analyzed using the certainty factor analysis method. Landslide susceptibility assessment and mapping were done thereafter. The natural breaks approach was used to divide the landslide susceptibility into five categories: extremely low,low,middle,high,extremely high,accounting for 8. 80%,18. 89%,25. 62%,25. 07% and 21. 62% of the study area respectively.Results reveal that,the extremely high and high susceptibility areas are mainly located at both banks of the Yangtze River and its tributaries,which is consistent with the actual distribution. Therefore,the study is of practical value in the disaster prevention and mitigation work.