Evaluation Of Ecological Security In Gansu Province Based On Improved Intuitionistic Fuzzy Sets

In recent years,the global ecological environment has changed dramatically,natural disasters have occurred frequently,and ecological environment safety has become a hot spot in international ecological research.The Yellow River Basin is an important economic and cultural construction area and an energy development zone in China.Its ecological environment is related to people’s well-being and the future of the nation.Gansu Province is located in the upper reaches of the Yellow River Basin,where the three major plateaus and the construction of ecological barriers meet,and its ecological status is extremely important.Therefore,it is of great significance to quantitatively analyze the regional ecological environment in Gansu Province and explore the ecological security level,which is of great significance to promote the high-quality ecological development of the Yellow River Basin,the construction of the plateau ecological barrier,and even the implementation of the national ecological civilization strategy.This paper firstly improves the intuitionistic fuzzy set theory based on the method of set pair analysis,approximate ideal solution TOPSIS,Euclidean distance,Hamming distance and Hausdorff distance.Then,the evaluation results of different ecological security evaluation methods are compared and analyzed to determine the optimal and improved ecological security evaluation method.Analyzing the trend of changes in its ecological security,the results show that:(1)Combining set pair analysis and improved intuitionistic fuzzy set theory for each closeness measure,this paper evaluates the overall ecological environment security in Gansu Province.The results show that from 2012 to 2019,the ecological security of Gansu Province has gradually improved from a medium level to an ordinary level,and the environmental status has continued to rise.Comparing the comprehensive evaluation results of the ecological safety of the improved intuitionistic fuzzy sets with each closeness degree and the set-pair analysis set pairing potential,it can be concluded that the comprehensive evaluation method of the intuitionistic fuzzy sets based on the set-pair analysis and approaching the ideal solution TOPSIS is better.Scientific,effective and applicable,its accuracy and sensitivity are higher.(2)Based on the optimal improved intuitionistic fuzzy set theory,a comprehensive assessment of the regional ecological status in Gansu Province was carried out.The results show that: the ecological environment in the northern part of Gansu Province has improved significantly from 2012 to 2019,the ecological security of Jiuquan City is stable at a slight level,and the ecological security level of Jiayuguan City has improved from extremely serious to medium;the ecological environment construction in central Gansu Province from 2012 to 2019 In good condition,the ecological security level of Jinchang City and Wuwei City has been improved from medium to normal,Baiyin City’s ecological security has been improved from serious to medium level,Lanzhou City’s ecological security has not changed,and Zhangye City’s ecological security has improved from normal to slightly safe;From 2012 to 2019,the ecological status of the southern region was relatively good.The ecological security level of Tianshui City and Gannan Prefecture increased from normal to mild,and the ecological security status of Linxia Prefecture improved from moderate to slightly safe.The ecological security of Qingyang City deteriorated from a serious level to an extremely serious level,and then gradually improved and stabilized at a moderate level of security.The ecological security of Dingxi City and Longnan City gradually approached a mild level.On this basis,relevant suggestions on the construction of ecological security in Gansu Province are put forward: promote the supply-side structural reform in Gansu Province,adjust the energy consumption structure,improve the efficiency of resource utilization,and promote the development of industries with high ecological and green rates;improve the utilization efficiency of production and domestic waste.With the support of scientific research and development,research and development and promotion of environmental protection and clean new technologies,expand the application field of carbon-free energy;improve the environmental protection system,strengthen supervision and testing,increase the punishment of industrial enterprises for violations,and promote the construction of ecological civilization.