Interdependency Impact Assessment Of Critical Infrastructure Systems In Typhoon Disasters

With the rapid development of social economy,industrial production activities are increasing gradually,seeking for and destroying natural resources behaviors on people become increasingly fierce.However,these behaviors break the balance between human and nature,thus leading to frequent occurrence of extreme disasters such as typhoon,earthquake,and acid rain.Liaoning,located in coastal area,is the province with the most typhoon disasters in northeast China.The large-scale power failure,traffic congestion and other emergencies caused by typhoon have seriously affected normal operation of critical infrastructure systems and brought about huge economic losses in Liaoning Province.Because there is interdependency between critical infrastructure systems,the infrastructure system vulnerable to disasters is impaired when the typhoon occurs,resulting in successive failure among interdependent infrastructures,critical infrastructure systems damage degree and losses caused by the disaster will be further expanded.Therefore,in order to strengthen the typhoon prevention capability,we should focus on the interdependency between critical infrastructure systems.Due to increased quantity and complex composition of critical infrastructure systems,the interdependency between infrastructure systems is increasingly close.Failure of a single infrastructure system will affect not only own function,but also the interdependent infrastructure.The study of a single infrastructure system can t fully reflect characteristics of the whole critical infrastructure system.Therefore,the study of the interdependency between multiple infrastructure systems can compensate for the limitations of the study of a single infrastructure system.In addition,most of the study are to analyze the interdependency formed by internal functional connections between infrastructure components,which involved inherent features and information transfer mode.Many parameters and functions require a large amount of data to calibrate,related data are difficult to obtain.The results are lack of quantification of economic losses.On the contrary,from the economic perspective,the interdependency can be formed based on economic data of input-output table and economic structure between critical infrastructure systems.In order to reduce disaster losses,the input-output method can quantify economic losses,and identify the highly interdependent infrastructure systems for priority protection.Therefore,based on the input-output method,this paper studies the interdependency between critical infrastructure systems,providing theoretical basis for strengthening the typhoon disaster prevention ability.To sum up,in order to meet the different demands of reality and research,this paper takes input-output table as data source and the input-output method as research method under the background of typhoon disasters.Based on the interdependency assessment model of critical infrastructure systems under disaster conditions,taking Liaoning Province as an example,the interdependency matrix of critical infrastructure systems is firstly established.Then,the initial failure degree of critical infrastructure system caused by typhoon is taken as data input,and the interdependency matrix is used for data processing to output the final failure degree of critical infrastructure systems,and interdependency impacts are evaluated and suggestions are proposed.The specific research process of this paper is as follows.The first chapter introduces research background,significance,and status at home and abroad,to put forward the demands of reality and research,then draw out the research problem of interdependency assessment of critical infrastructure systems under typhoon disasters.The second chapter introduces the concepts related to critical infrastructure and the input-output method,to provide theoretical support for the follow-up research.In the third chapter,the interdependency assessment model of critical infrastructure systems under disaster conditions is divided into two parts:firstly,the interdependency matrix of critical infrastructure systems is established;then the interdependency matrix is used to process the data of failure degree of critical infrastructure systems under disaster conditions,and the interdependency impacts are evaluated.The fourth chapter takes Liaoning Province as an example to establish the interdependency matrix by determining critical infrastructure system and input-output relationship.The fifth chapter takes typhoon as an example,the initial failure degree of critical infrastructure systems as input variable,through the interdependency matrix for data processing,to output final failure degree of critical infrastructure systems,then evaluates interdependency impacts and put forward suggestions.The sixth chapter summarizes research conclusions and puts forward prospects of future research.The research conclusions of this paper are as follows.Firstly,the failure of electricity infrastructure system has a great interdependency impact on electricity and transportation infrastructure systems.Before typhoon disasters,transportation and electricity infrastructure systems should be given priority protection.Secondly,in recent years,the whole ability of critical infrastructure systems to resist typhoon disasters and the urban infrastructure management level have been greatly improved in Liaoning province.The ability of water supply and electricity infrastructure systems to resist typhoons is gradually enhanced;communication and transportation infrastructure systems are becoming less resilient to disasters.Thirdly,in the future,Liaoning province may not need to significantly adjust its management policies for water supply and electricity infrastructure systems.Instead,it should adjust for communication and transportation infrastructure systems,and focus on strengthening guarantee of the functions of communication and transportation infrastructure systems under typhoon disasters.This paper can make scholars in the field of critical infrastructure focus on economic method research and macro perspective in theoretically.The research results can not only make the highly interdependent infrastructure systems for priority protection,to reduce economic losses of infrastructure systems,but also increase the connection between different infrastructure sectors to improve the efficiency of collaboration.It is hoped that this paper can provide research ideas and directions for infrastructure-related fields.