| The continuous increase in infrastructure construction leads to the rapid development of urban subways.The subway lines and operating mileage have increased year by year,and many cities have begun to extend subway operating lines.In this context,the urban subway is more and more closely related to the transportation of residents’ transportation.However,due to the joint influence of risk coupling from passengers,staff,operation equipment,internal and external environment,operation management and other factors during the operation of urban subway,many potential complex environmental risks will pose a great threat to the health of users,resulting in the gradual emergence of the vulnerability of subway microenvironment health.At present,scholars’ research on urban subway mostly focuses on sustainable construction and safety management.Some scholars begin to pay attention to subway microenvironment,but only focus on a certain dimension,such as air quality and noise,and mostly ignore exploring the root causes of subway microenvironment health risk exposure,lacking systematic research on the driving factors of subway microenvironment health vulnerability and their interaction.Therefore,this paper comprehensively and systematically explores the coupling mechanism of driving factors of urban subway microenvironment health vulnerability.Firstly,based on literature research,the driving factors of microenvironment health vulnerability during urban subway operation were preliminarily identified from the four dimensions of personnel,equipment,environment and management.And the preliminarily identified driving factors were further screened,sorted and summarized by using expert interviews and field research,so as to determine the list of driving factors of microenvironment health vulnerability of subway.Then the meaning of each driving factor was described,and the coupling process of homogeneous and heterogeneous factors of each driving factor was clarified combined with the causal loop diagram of system dynamics.Secondly,after comparing the advantages and disadvantages of each risk coupling degree calculation model,the coupling degree model based on cloud theory was determined to use to measure the coupling degree of driving factors of subway microenvironment health vulnerability according to the characteristics of the research object in this paper.Therefore,the coupling degree model of driving factors of microenvironment health vulnerability during subway operation was established.Then after obtaining data through expert investigation,the coupling effect of personnel,equipment,environment and management under different coupling modes was calculated.Meanwhile,the coupling law of driving factors of subway microenvironment health vulnerability was revealed,that is,the urban subway microenvironment health risk increases with the increase of the number of driving factors of environmental health vulnerability involved in the coupling in the subway microenvironment system.Finally,based on the qualitative analysis of the coupling relationship between the driving factors of subway microenvironment health vulnerability and the measurement of the coupling effect,the coupling risk system dynamic model of driving factors of urban subway microenvironment health vulnerability during operation was constructed.The development trend of the coupling risk level of subway microenvironment health system was revealed through simulation after determining the variables and their equations.And the influence of each driving factor on the development trend of the coupling risk level of subway microenvironment health system was dynamically observed by adjusting the coupling coefficient of each driving factor.Thus,the key factors affecting the health vulnerability of subway microenvironment in different stages of subway operation were determined,and then targeted countermeasures and suggestions were put forward to reduce the health vulnerability of urban subway microenvironment during subway operation.Findings of this research clarify the driving factors of subway microenvironment health vulnerability,qualitatively analyze the coupling relationship between the driving factors,quantitatively calculate the coupling effect between the driving factors,and realize the prediction of the change trend of coupling risk of driving factors during subway operation.It is helpful for relevant management departments of subway operation to take diversified and targeted measures from the source at different stages of subway operation to reduce the health vulnerability of microenvironment during urban subway operation,which is of great theoretical and practical value to for ensuring the sustainable and healthy operation management of microenvironment during subway operation and promoting the healthy and sustainable construction and development of urban subway projects in China. |
