摘要
广东省地质灾害主要以崩塌、滑坡等斜坡类地质灾害为主,规模多为小型,多发生在粤北、珠三角地区。受地形坡度的控制明显,坡度为60~70°的地段最易发生崩塌,坡度为30~50°时最易发生滑坡。斜坡类地质灾害的发生与降雨、人类活动最为密切。因人为活动直接或间接引发的地质灾害占比超过86%,其中削坡开挖是引发地质灾害最多的人类活动,占比90%以上。约92%的地质灾害发生在4—9月,其中6月暴发频率最高。当日降雨量大于150 mm时,崩塌、滑坡、泥石流发生的概率显著上升。
The geological disasters in Guangdong Province are mainly slope geological disasters such as collapses and landslides.Most of them are small in scale and occur in northern Guangdong and the Pearl River Delta region.They are obviously controlled by the factor of the terrain slope.The section with a slope between 60°and 70°is most prone to collapse,and the section with a slope between 30°and 50°is most prone to landslides.The occurrence of slope geological hazards is closely related to rainfalls and human activities.Geological disasters directly or indirectly caused by human activities account for more than 86%,among which slope cutting and excavation cause the most geological disasters,accounting for more than 90%.About 92%of geological disasters occur from April to September,with the highest outbreak frequency in June.When the daily rainfall is greater than 150 mm,the probability of collapse,landslide,and debris flow increases significantly.
作者
刘春艳
LIU Chunyan(The Third Geological Brigade of Guangdong Geological Bureau,Shaoguan 512026,Guangdong,China)
出处
《城市地质》
2023年第4期15-23,共9页
Urban Geology
基金
广东省县(市、区)地质灾害详细调查集成报告(1∶50000)(0835-210ZZ22805561)。
关键词
广东省
地质灾害
发育特征
影响因素
降雨
Guangdong Province
geological hazards
developmental features
influencing factors
rainfall
