关键词: SPCA, I')">Moran's I, 地质灾害, 敏感性, 闽三角城市群

Abstract:

Ecological safety is the fundamental guarantee for the sustainable development of regional society and economy. However, geological hazards will pose serious threats to the ecological safety of the area. It has great significance to analyze the sensitivity of geological hazards in Urban Agglomeration of Fujian Delta Region. In this paper, eight indicators are selected including slope, elevation, soil types, NDVI, lithology, average annual precipitation, the distance from the main road and the geological hazards points in 5km grids, for comprehensively assessing the sensitivity of geological hazards in urban agglomeration of Fujian Delta Region based on SPCA, global Morans'I and local Morans'I. The results show that the urban agglomeration of Fujian Delta Region is moderately sensitive in the overall, and the areas of different sensitivities decrease in the order of moderately sensitive>highly sensitive>light sensitive>extremely sensitive>insensitive, accounting for 26.96%, 25.67%, 23.89%, 11.75% and 11.72% of the regain, respectively. The sensitivity of geological hazards from southeast coast to northwest inland shows a gradual transition from insensitivity to extreme sensitivity with obvious zonal characteristics. There is significant spatial heterogeneity in sensitivity of geological hazards between different counties (cities and districts) and their internal areas. The sensitivity of geological hazards has significant spatial autocorrelation, which is a significant positive correlation, showing significant spatial clustering characteristics with the high-high clustering in Dehua, Yongchun, Anxi and Nanjing, low-low clustering in Huian, Licheng, Jinjiang, Shishi. The sensitivity synthesis index of geological hazards between different land use types is in the order of forestland > grassland > unused land > farmland > wetland > construction land. The forestland and grassland are overall moderately sensitive, while wetland, farmland, construction land and unused land are light sensitive in the overall. The average annual precipitation, slope, distance from the main road, number of 5 km grid geological hazards points, lithology and soil types are the main driving factors of geological hazards in the study area.

Key words: SPCA, I')">Moran's I, geological hazard, sensitivity, urban agglomeration of Fujian Delta Region