1. An Original Model of Infrastructure System Resilience
Jingjing Kong
Slobodan P. Simonovic
June 2, 2016

2. Contents Introduction Infrastructure Network Formalization
Infrastructure System Resilience
Simulation Framework

3. 886 disasters in Canada from 1950

4. Infrastructure system response
Cascading failures throughout the whole infrastructure system at regional and national scales.
Effective protection and recovery strategies are hard to make.
Infrastructure system resilience is often overestimated.
Most researches use system robustness or system recovery rapidity of individual infrastructure system as resilience quantification metrics.
Figure. Interdependence of different infrastructure (Rinaldi et al., 2001)

5. Infrastructure System Model
Network of networks /multilayer network
Nodes of the infrastructure networks have three coordinates
Edges
Intra-network links
Inter-networks links
Information
network
Power grid ,
Water supply
network
Street network

6. Basic Infrastructure Dependence Patterns
Node – Node dependence ( )
State of node is dependent on the state of node
Node – Edge dependence ( )
State of node is dependent on the state of edge
Node/Edge – Path dependence ( / )
State of node or edge is dependent on State of path
Node/Edge – cluster dependence ( / )
State of cluster is dependent on State of node or edge
Geographic Dependence ( )
State of all infrastructure elements located at the same location A are
affected by a disturbance simultaneously

7. Infrastructure Interdependence Formalization
Interdependence of two individual networks
Four dependence: First order impacts
Combination of first order impacts
Interdependence of three or more individual networks
Diverse combinations of two individual networks dependences
Higher-order impacts: Chain and cycle reactions

8. Infrastructure System Dynamics Mechanism
Figure. Adaptive capacity of an infrastructure after a disturbance
Buffer time
Malfunction time
Repair time
Figure. Dynamic process of an infrastructure after a disturbance

9. Definition of infrastructure system resilience
Based on the definition by Bruneau et al (2003) , Simonovic et al (2013), Presidential Policy Directive 21 and other sources focusing on engineering resilience of networked infrastructures.
Infrastructure system resilience is the systems’ ability to resist (prevent and withstand) possible hazards, absorb the initial damage from hazard, and recover to normal operation levels.
Reactive absorptive capacity AND Proactive restorative capacity
Robustness, Redundancy, Resourcefulness, Rapidity

10. Infrastructure system performance
Resourcefulness: the capacity to identify problems, establish priorities, and mobilize resources when conditions exist that threaten to disrupt some elements, or a system.
Robustness: the ability of a systems to withstand a given level of stress without suffering degradation or loss of function.
Rapidity : the capacity to meet priorities and achieve goals in a timely manner in order to contain losses and avoid future disruption.
Typical Performance Process of Infrastructure System

11. Infrastructure system resilience
Typical Performance Process of Infrastructure System

12. Simulation Framework Multilayer Infrastructure Network Model
Infrastructure System
Dynamic Mechanism
interdependence
TB, TR, TM
Restorative
Strategy
Single Layer Infrastructure System Performance
Disaster Scenario
(removal of network elements )
Multilayer Infrastructure System Resilience

13. Thank you! Jingjing Kong kjingjin@uwo.ca RESILIENT INFRASTRUCTURE
June 1–4, 2016
Thank you!
Jingjing Kong