Study on the Spatio-temporal Distribution Law of Geological Hazards and the Disaster-inducing Environment in the Northeastern Guizhou
Northeast Guizhou is a region with a complex geological environment,with a wide distribution range and a large number of geological Hazards,making it a high-risk area for geological hazards in Guizhou Province.In order to conduct in depth research on the Spatio-temporal distribution characteristics of geological hazards and the laws of geological environment,Yanhe county in northeastern Guizhou was selected as the research area.Through regional survey of disaster-inducing environment and combined with geological hazards data from previous years,the overall distribution characteristics of geological hazards in the research area were elaborated in detail.The geological conditions of geological hazards were summarized,and the control effects of various disaster-inducing factors on the development of geological hazards such as landslide and collapse were analyzed in depth.The results indicate that the occurrence of geological disasters in the study area is significantly affected by the average monthly rainfall.The spatial distribution is greatly influenced by the lithological characteristics of the strata.The main geological conditions for geological hazards in the area are terrain,lithology,slope structure,etc.,with rainfall and human engineering activities as external inducing factors.The main slippery stratum in the area are the Xiushan Formation of Middle Silurian,the Longmaxi Formation of Lower Silurian,and the Dawan Formation of Lower Ordovician.The easily collapsing strata are mainly composed of the Dawan Formation of Lower Ordovician,the Leijiatun Formation of Lower Silurian,and the Maokou Formation of Middle Permian.The slope structures of different types of hazards have significant differences. Landslides mainly develop on concave and broken line slopes, while collapses mostly develop on convex slopes. There is a certain correlation between the occurrence of geological hazards and the surface water system in study area. The number of geological hazards occurring within 200m along the Wujiang River Basin in the area accounts for 9.74％ of the total.
geological hazardsdisaster-inducing conditionlandslideYanhe county
NETL
NSTL
万方数据
