Vulnerability Analyses of Interdependent Technical Infrastructures
In this chapter, the modelling framework presented in Chap. 5 will be used to perform vulnerability analyses from three perspectives: global vulnerability, critical components, and geographical vulnerability. Two case studies of two real-world interdepen
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Vulnerability Analyses of Interdependent Technical Infrastructures Jonas Johansson and Henrik Hassel
Abstract In this chapter, the modelling framework presented in Chap. 5 will be used to perform vulnerability analyses from three perspectives: global vulnerability, critical components, and geographical vulnerability. Two case studies of two realworld interdependent infrastructure systems are performed; one focusing on an electric distribution system coupled with a water distribution system, and one focusing on a railway system which is composed of seven interdependent systems.
6.1 Introduction The present chapter utilizes the modelling framework for interdependent critical infrastructures, Sects. 5.3–5.4, in the context of vulnerability analysis, as presented in Sect. 5.5. The goal is to exemplify, through case studies, both the modelling of actual infrastructures and the type of results that can be obtained from vulnerability analyses. Assumptions and simplifications needed for the modelling as well as how to carry out vulnerability analyses in a more practical sense are addressed. The two case studies are both from a Swedish context and the types of infrastructures addressed are as follows:
J. Johansson (&) Department of Industrial Engineering and Automation, Lund University, Lund, Sweden e-mail: [email protected] J. Johansson H. Hassel Lund University Centre for Risk Assessment and Management (LUCRAM), Lund, Sweden e-mail: [email protected] H. Hassel Department of Fire Safety Engineering and Systems Safety, Lund University, Lund, Sweden
P. Hokstad et al. (eds.), Risk and Interdependencies in Critical Infrastructures, Springer Series in Reliability Engineering, DOI: 10.1007/978-1-4471-4661-2_6, Springer-Verlag London 2012
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J. Johansson and H. Hassel
1 Interdependent electric distribution system (EDS) and water distribution system (WDS). 2 Railway system consisting of seven interdependent systems. The modelling of the infrastructures followed the outlined framework given in Sects. 5.3 and 5.4. In each of the case studies, specific information of simplifications, assumptions and how the infrastructures were represented, in terms of structural and functional models, are given. The models of the systems were represented in numerical matrix forms (structural model) and algorithms (functional model). The simulation cycle structure given in Fig. 5.3 was implemented in computer executable code. The system representation and implementation were carried out using MATLAB. The first case study is presented in Sect. 6.2, and the second case study is presented in Sect. 6.3. In Sect. 6.4, some general conclusions from the case studies are presented, focusing on the effects of interdependencies between critical infrastructures.
6.2 Case Study 1: Electric Distribution System and Water Distribution System This case study presents the results from a vulnerability analysis of an electric power distribution system (EDS) and a water distribution system (WDS), which is dependent on the EDS, located
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