Zoning of landslide geological disaster-prone environment and its formation mechanism in Xizang

Wei Luning; Guo Yonggang

doi:10.3969/j.issn.1004-3403.2024.09.005

Abstract：Xizang is vast with frequent disasters,so it is crucial to rationally zone the environment for geological di-sasters.Considering the topography,engineering geology,stratigraphic lithology,meteorology and climate of Xi-zang,this paper proposed the disaster-bearing zoning for the whole Xizang area,and selected the typical landslide geological disasters in the disaster-bearing zoning to carry out special research on the influencing factors and mecha-nisms.The results are as follows:(1)The disaster-bearing environment of landslide geological disasters in Xizang is divided into seven sub-zones,namely Altun Mountain,Kunlun Mountains,Gangdis Mountains,Tanggula Mountains,Qilian Mountains,Himalayan Mountains and Hengduan Mountains;(2)In terms of spatial distribution,the landslide geological disasters are developed along the Himalayan and Hengduan Mountains;while in terms of temporal distri-bution,the occurrence of the disasters is closely related to the glacial lake melt and precipitation;(3)The three re-gions,namely Kunlun Mountains,Himalayan Mountains and Hengduan Mountains are the most landslide and mud-slide prone areas;Gangdis Mountains and Tanggula Mountains are the most avalanche and landslide prone areas;the environmental conditions for geological hazards including geological formation,precipitation,and stratum lithology are closely related to the formation of these disasters.The research resultspromote the summarising of the environ-mental zoning,disaster distribution and disaster-bearing mechanism in Xizang,and can further solve the key prob-lems of geological disaster prevention and control,such as"where is the disaster"and"how the disaster develops".