The temporal and spatial evolution of natural disasters in China

This article takes 31 provincial administrative units in China as the research object, selects a number of disaster index, and uses AHP method to weight the absolute index and relative index of disasters in China during 2010–2016, respectively, so that the intensity of disasters and the regional The degree of influence was quantified; spatial spatio-temporal evolution characteristics of natural disasters in China were analyzed using spatial interpolation analysis, time series analysis, and gravity model; Spearman correlation analysis was used to analyze waste water, waste gas, solid waste, and urban gardens. In terms of afforestation and other aspects, a number of social factors are selected to analyze the correlation between these social factors and the changes in disaster conditions. The research shows that in the study period, the southwestern region of China is the region with the highest intensity of disasters, and the northwest and southwest regions are the regions with the deepest degree of disaster impact; the degree of disasters has spatial clustering in time series, in which the disaster situation presents Rise-Down-Rise. The center of China’s absolute index of disasters is mainly located at the junction of Hubei, Shaanxi, and Sichuan. The relative index spatial center is located in the southeast of Shaanxi Province and the northern part of Chongqing. In the social elements, chemical oxygen demand emissions, sulfur dioxide emissions, industrial solid waste discards and disposal of domestic waste and park green space. The area and urban afforestation coverage are generally related to the disaster index. Among them, the greater the discharge of waste water, waste air and solid waste, the greater the intensity of the disaster; the larger the green area of the city, the greater the amount of solid waste disposal, and the lower the impact of the disaster on the development of the area.