粤北山区某县地质灾害分布规律与影响因素探析

Analysis of the distribution law and influencing factors of geological disasters in a county in the mountainous area of northern Guangdong

地质灾害详查是开展群防群策、保证人民群众生命财产安全的重要工作,研究地质灾害规律对地质灾害综合防治分区具有重要意义。以粤北山区某县为例,利用地理统计学方法,采用ARCGIS软件的空间分析功能,进行了研究区地质灾害分布规律和影响因素探讨。结果表明:(1)研究区Moran I指数为0.949,地质灾害发生时间与降雨时间相吻合,且在空间分布上趋于集中和明显的地域性;(2)研究区已发地质灾害以中小型土质滑坡、崩塌为主,当地居民大规模削坡建房、削坡修路是主要人为动力因素。降雨是地质灾害的重要诱因,人为工程活动对地质灾害的影响同样不可忽视。

The detailed investigation of geological disasters is an important work to carry out mass prevention and collective strategy and ensure the safety of people's lives and property,and the study of the law of geological disasters is of great significance to the comprehensive prevention and control of geological disasters.Taking a county in the mountainous area of northern Guangdong as an example,the distribution law and influencing factors of geological disasters in the study area were discussed by using geostatistical methods and the spatial analysis function of ArcGIS software.The results indicated that:①The Moran I index in the study area was 0.949,the occurrence time of geological disasters coincided with the rainfall time,and the spatial distribution tended to be concentrated and obvious in terms of regionality;②The geological disasters in the study area were mainly small and medium-sized soil landslides and collapses,and the large-scale slope construction and road construction by local residents were the main human driving factors.Rainfall is an important cause of geological disasters,and the influence of human engineering activities on geological disasters cannot be ignored.