Study On Characteristics Of Geological Hazards And Its Control Measures Based On GIS In Dachuan

This paper studied the statistical characteristics of geological disaster hidden danger in 2017 on DaChuan,DaZhou,and combining terrain factors such as elevation,slope,slope direction and the region of prone to geological disasters in 2017,analyzed the characteristics of the geological danger of the geological disasters in the region based on ArcGIS,the causes of geological disasters had been analyzed,the prevention and control measures had been proposed as well.The result showed that:(1)The geological hazards are serious,and the distribution density is relatively concentrated,including landslide,collapse,debris flow,ground subsidence and unstable slopes.Landslide-based geological disasters,accounting for the total number of geological hazards in the region 86.03%.The geological hazards are divided into small,medium,large and extraordinarily large.Mainly the small ones,accounting for the total number of geological hazards in the region 90.68%.(2)The geological hazards in the spatial distribution of the northwest and the southeast showed a relatively concentrated.In different altitudes,the geological hazards are mainly distributed in the area of 300m-500 m.The landslide and collapse are mainly distributed in the area of 300m-500 m.The ground subsidence are mainly distributed in the area of 400m-600 m.The hidden dangers of small-scale geological disasters are mainly distributed in the area of 300m-500 m,and the medium-sized are mainly distributed in the area of 400m-600 m.In different slopes,the geological hazards are mainly distributed in the area of 5 °-10 °,10 °-15 °and 15 °-25 °.The landslide and collapse are mainly distributed in the area of 5 °-10 °,10 °-15 °and 15 °-25 °.The ground subsidence are mainly distributed at the area of 5 °-10 °,10 °-15 °.The hidden dangers of small-scale geological hazards are mainly distributed in the area of 5 °-10 °,10 °-15 ° and 15°-25 °,the medium-sized are mainly distributed in the area of 10 °-15 °,the large-scale are mainly distributed In the area of 5 °-10 °,10 °-15 °.There are no significant differences in the distribution of hidden dangers of geological disasters on different slopes.In different region of easy-happening to geological disasters,the geological hazards are mainlydistributed in the high easy-happening area(A)and the easy-happening area(B).The landslide and collapse are mainly distributed in the high easy-happening area and the easy-happening area.The ground subsidence are mainly distributed in the high easy-happening area.The hidden dangers of small-scale geological disasters are mainly distributed in the high easy-happening area and the easy-happening area.The medium-sized and the large-scale are mainly distributed in the high easy-happening area.(3)The characteristics of geological disasters in the study area are related to the topography,lithology,geological structure and natural human.The prevention and control measures was put forward,which is great significance to the prevention and control of geological disasters in this area.