Spatiotemporal variations of geological disaster risk and obstacle factor diagnosis: A case study of the western Sichuan region
YANG Hengjun1(), YANG Xin1,2(), ZHOU Xiong3
1. College of Geography and Planning, Chengdu University of Technology, Chengdu 610059, China 2. Key Laboratory of Earth Exploration and Information Techniques, Ministry of Education, Chengdu 610059, China 3. Institute of Multipurpose Utilization of Mineral Resources, Chinese Academy of Geological Science, Chengdu 610041, China
Geological disasters, influenced by natural and human factors, directly threaten the safety of people’s lives and property. Exploring the spatiotemporal variations and development mechanisms of geological disaster risk can enhance disaster prevention and mitigation. This study examined 31 factors such as topography, rainfall, and social economy from the perspectives of nature and humanity. Based on the four-factor risk theory, this study investigated the variations of geological disaster risk in the western Sichuan region using methods like the analytic hierarchy process, principal component analysis, information value model, entropy weight method, and hot/cold spot analysis. Employing the obstacle degree model, this study explored the degrees of influence of various factors on geological disaster risk in the western Sichuan region. The results indicate that from 2007 to 2022, the geological disaster risk in the western Sichuan region was generally characterized by higher levels in the west and lower levels in the east. Kangding and Maerkang were the concentrated distribution areas of perennial cold spots. The area of extremely low and low risk levels increased by 8 871.1 km2 and 12 478.6 km2 respectively at growth rates of 1.056%/a and 1.485%/a respectively. The area of high and extremely high risk levels decreased by 10 127.8 km2 and 9 880.1 km2 respectively at growth rates of -0.02484 km2/a. The degrees of influence of various factors on risk levels exhibited temporal heterogeneity. The dominant obstacle factors (obstacle degree: above 5 %) were concentrated in risk and disaster prevention and mitigation indicators. Factors including rainfall, topography, and medical resources contributed significantly to geological disaster risk.
杨衡钧, 杨鑫, 周雄. 川西地质灾害风险时空变化及障碍因子诊断[J]. 自然资源遥感, 2025, 37(4): 140-151.
YANG Hengjun, YANG Xin, ZHOU Xiong. Spatiotemporal variations of geological disaster risk and obstacle factor diagnosis: A case study of the western Sichuan region. Remote Sensing for Natural Resources, 2025, 37(4): 140-151.
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