Risk assessment of geological hazards in Dingxi region of Gansu Province

Abstract

It is of great significance to identify the hot spots and driving forces of geological hazard gathering for regional disaster early warning. Dingxi region of Gansu Province is taken as a the study area. Seven factors such as slope, aspect, land use, engineering rock group and so on are selected to analyze the spatial agglomeration characteristics and driving factors of geological hazards by using coupling model of determining coefficient and logical regression and spatial autocorrelation. The results show that the sensitivity of geological hazards in Dingxi region is high in the middle region and low in the north and south region. The spatial relationship between geological hazards and precipitation, aspect and engineering rock group is high accumulation. Geological hazard sensitivity has strong spatial autocorrelation, which is significantly positive correlation in 3 km scale, and decreases with the increase of distance threshold. When the distance threshold is 5 km, the high and low aggregation areas are clustered and distributed in the form of clumps, while the high and low aggregation areas and the low and high aggregation areas are mostly scattered. The research can provide reference for regional geological hazard monitoring and control.

Keywords

• geological hazard
• determination coefficient method
• logical regression model
• spatial autocorrelation analysis