Main types and spatial distribution of geohazards in Baoji City, Shaanxi Province

Baoji City is one of the areas in China that suffer from geo-hazards. To evaluate the spatial distribution of landslide disasters，the authors analyzed the main types of geo-hazards and their distribution characteristics on the basis of detailed investigation and comprehensive research on geo-hazards in Baoji City. The study was focused on the regional spatial distribution of different types of geological hazards. The results show that landslides, collapses, debris flows and unstable slopes are main types of geological hazards in Baoji City. There are 887 landslides accounting for 7.75% of the total geological hazards. Landslides are mainly distributed in Weihe River valley, northeast hilly area, and southern and western intermountain basins where there are frequent human engineering activities and engineering cutting slopes. There are 328 collapses, accounting for 21.23%. The number of unstable slope reaches 234, accounting for 15.15%. Collapses and unstable slopes are distributed in the loess plateau edge slope belt surrounding Weihe River basin, steep slopes in northeast typical loess hilly area and engineering slopes along road transportation lines. There are 96 debris flows, which possess the least proportion of all the geo-hazards, accounting for 6.21%. The disaster reduction and prevention in Baoji City should be focused on the shallow landsides and collapses nowadays, especially small-scale loess collapse and rock collapses behind resident buildings and small slopes along mountain highways.