A Study On Geological Hazard Risk Zoning And Village Resilience In Southeast Tibet

The southeast Tibetan region is located on the Qinghai-Tibet Plateau in China,with frequent geological tectonic activities,huge differences in altitude,complex topography and climate change,geological hazards are one of the main natural disasters in the region,with wide distribution,high frequency and large losses.Improving the resilience is an effective way to reduce the losses of geological hazards.At present,less attention has been paid to the research on the resilience of villages,which is conducive to reducing the serious losses caused by geological hazards after the occurrence of major engineering projects in the high mountain valley area of southeast Tibet.On the basis of the survey of geological hazards and their disaster-bearing bodies in southeast Tibet,this paper constructs an index system for the evaluation of geological hazard and vulnerability of disaster-bearing bodies,evaluates and classifies the comprehensive risk of geological hazards in southeast Tibet,and constructs two categories of village resilience evaluation index systems,namely,livelihood capital and disaster prevention and mitigation capacity,from the resilience theory.The study also investigates and evaluates village resilience in different geological hazard risk areas in southeast Tibet,revealing the differences in village resilience in different geological hazard risk areas,with a view to providing targeted social coping strategies for geological hazard risk in southeast Tibet.The findings of this study are as follows.(1)There are 2236 geological hazards in Southeast Tibet,with landslides,cave-ins and debris flows accounting for 90.35% of the total number of geological hazards.The comprehensive assessment found that the risk of geological hazards in Southeast Tibet is high,with 61.8% of the total area being of medium risk or above,and the probability of geological hazards is high.The indicators that have a greater impact on the degree of risk are river density,lithology,hazard density and fault density.The vulnerability of geological hazards is low,with 54.5% of the total area under medium vulnerability.The indicators that have a greater impact on vulnerability are forest land and road traffic density.The distribution of villages in south-eastern Tibet is more consistent with the distribution of geological hazards of high risk,as the distribution of villages in areas with medium or higher geological risk accounts for 74.2% of the total villages.Based on the natural conditions,based on the aggregation degree of each level of geological hazard risk,the area of southeast Tibet was divided into four geological hazard risk zones.(2)The results of the village resilience survey show that there is a positive relationship between villages and geological hazard risk in southeast Tibet,and the higher the risk of geological hazards,the higher the resilience of villages.Large livestock is an important factor affecting livelihood capital in southeast Tibet,and the ability to prevent and mitigate disasters is closely related to the local experience of geological hazards,and improving villages in southeast Tibet mainly lies in improving the livelihood capital of residents in the region.(3)Low-risk geological hazard areas,where geological hazards are less distributed,should be monitored mainly by small-scale geological hazard sites,and the disaster-bearing bodies are mainly transportation lines,which should increase the disaster prevention and mitigation capacity of the roads themselves and establish a good partnership with the transportation sector.In the medium-risk area,there are many geological hazards,and a comprehensive prevention and control system should be established for the defence of geological hazards.The disaster-bearing bodies are mainly concentrated in towns and cities.Geological disaster drills for crowded places should be increased in built-up areas of towns and cities,and geological disaster factors should be fully considered in the town planning process.In the high-risk areas of geological hazards,large group landslides,landslides,mudslides and other geological hazards are widely developed and large in scale,and comprehensive basic investigation work that requires a system needs to be carried out to improve the level of technological prevention and control of geological hazards.Disaster-bearing bodies are concentrated in river valley areas,and three-dimensional protection capacity needs to be improved.