Multidimensional Coupling Evaluation Of Urban Spatial Vulnerability In The Three Gorges Reservoir Region

The special geographical location and climate change lead to the fragile natural environment and frequent geological disasters in the Three Gorges Reservoir area,which threaten the urban space security.With the continuous development of urbanization,the size of the population is close to the urban space bearing limit,a large amount of resource consumption,and the contradiction between human and land is prominent.Extensive economic development has resulted in a significant gap between urban and rural areas,and the imbalance between the supply of material facilities and population demand has restricted the high-quality prosperity and development of the economy and society.Due to the multi-dimensional coupling characteristics of the complex urban space giant system,the increasingly prominent contradictions and conflicts make the urban space vulnerability in the Three Gorges Reservoir area more complex and comprehensive.How to reduce the vulnerability to promote the coupled and coordinated development of complex giant system in the reservoir area and ensure the security of urban space is an important issue to be solved urgently.First based on this study to human settlement environment science theory and the complex system theory,combing urban space accommodate limits and characteristics of the bearing capacity and combined with vulnerability "pressure-state-response",the mechanism,to carry to "force" the connotation and extension to build the "bearing pressure-bearing support-bearing potential" the fragility of the conceptual framework.Secondly,the characteristics of coupling vulnerability of urban space complex giant system in Hubei section of the Three Gorges Reservoir Region were qualitatively analyzed,based on which an evaluation index system was established and the vulnerability levels in 2010,2015 and 2020 were quantitatively calculated.Then the coupling coordination degree model is used to evaluate the development level and evolution trend of the coupling coordination between natural resources,physical space and economic society.Finally,the main controlling factors of urban space vulnerability in Hubei section of the Three Gorges Reservoir area are calculated by the grey correlation degree method.The results show that: 1.The vulnerability level in Hubei section presents a trend of gradual decline in three time nodes.2.Although the coupling degree between the "natural resource-material space-economic society" system is as high as 0.9546,and the degree of interaction is very strong,the coupling coordination level is only 0.2244,which is in the "moderately unbalanced development type".3.There is a significant positive correlation between vulnerability and bearing pressure,with the Pearson correlation coefficient reaching0.613* and a significant negative correlation between vulnerability and "carrying potential",with the Pearson correlation coefficient reaching-0.537*.4.Factors such as "area proportion of areas with high sensitivity to geological disasters","industrial SO2 emissions","commonly used arable land area" and "effective irrigation area" are the main control factors leading to vulnerability.Strategies and methods to reduce urban spatial vulnerability are proposed based on the main control factors,which can effectively improve the coupling coordination of complex giant system and guarantee urban spatial security.