Analysis on the Development Characteristics and Geological Conditions of Debris Flow in Duilong Deqing District,Xizang

Xizang is one of the provinces and regions with the most serious geological disasters in China. The impact of geological disasters on economic and social development is becoming increasingly significant. To study the development characteristics and geological conditions of typical disaster debris flows in the Deqing District of Duilong, this article is based on the results of a 1: 50000 geological hazard risk investigation and evaluation. Based on a systematic summary of the development characteristics and spatiotemporal distribution patterns of debris flow disasters in the research area, ArcGIS spatial analysis method is used to explore the relationship between debris flow disasters and factors such as topography, geological structure, engineering geological rock formations, water system density, and vegetation coverage. The research results show that there are a total of 117 debris flow disaster points developed in the area, the scale of disasters is mainly small-scale disasters, mainly occurring in July and August, which characterized by concentrated distribution along fault structures, rivers, and deep river valleys. There is a varying degree of correlation between topography, geological structure, engineering geological rock formations, water system density, and debris flow. The smaller the watershed area, the greater the longitudinal slope of the channel, and the higher the density of faults and water systems within the watershed, which is more conducive to the formation of debris flow disasters; And the easily slippery strata provide favorable source conditions for the development of debris flows. The formation of debris flow disasters is closely related to the above-mentioned disaster prone factors, and is the result of the coupling effect of multiple factors, which can provide a reference basis for the prevention and control of debris flow disasters in the study area.