Risk Assessment of Extreme Precipitation-Geological Hazard Chains in the Yunnan-Guizhou Plateau

Guangzhi Rong and Jiquan Zhang ()
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Guangzhi Rong: Northeast Normal University, School of Environment
Jiquan Zhang: Northeast Normal University, School of Environment

A chapter in Proceedings of the 10th Annual Meeting of Risk Analysis Council of China Association for Disaster Prevention (RAC 2022), 2023, pp 18-25 from Springer

Abstract: Abstract In this study, based on the four elements of natural disaster risk formation theory, indicators were selected from four aspects of extreme precipitation-geological hazard chain, exposure and vulnerability of disaster-bearing bodies, and disaster prevention and mitigation capacity, and a risk assessment index system and assessment model were constructed based on different extreme precipitation recurrence period scenarios. The risk assessment study of extreme precipitation-geological hazard chain was carried out in Shuicheng, Zhongshan and Weining counties in Guizhou Province, and Huize and Xuanwei cities in Yunnan Province. The results show that the high susceptibility areas are mainly concentrated in Shuicheng County, Zhongshan District, northern Xuanwei City and northern Huize County with high terrain, multiple faults and loose rock texture. The spatial distribution of hazard is similar to that of susceptibility, and with the increase of the return period of extreme precipitation, the areas with high-hazard classes increase. The overall exposure and vulnerability level of the study area is low, and the high disaster prevention and mitigation capacity is mainly concentrated in the highways, national highways and urban areas of cities and counties. Most of the areas in the study area are very low and low risk, and the high-risk areas are mainly concentrated in the central and southern parts of Xuanwei City, the northeastern part of Shuicheng County, and Zhongshan District. As the extreme precipitation is higher, the corresponding risk is also higher. The results of this study can provide a scientific basis for local emergency departments to set the corresponding warning levels and their emergency plans and response measures by establishing the risk levels of geological hazards under different rainfall conditions. The implementation of various regional disaster prevention and mitigation efforts will be strengthened to protect the lives and properties of residents.

Keywords: Risk Assessment; Geological Hazard; Extreme Precipitation; Yunnan-Guizhou Plateau (search for similar items in EconPapers)
Date: 2023
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DOI: 10.2991/978-94-6463-194-4_4

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