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Infrastructure Resilience Conference 2018

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A Topological Characterization of the Performances of the Road Infrastructure Network Under Flooding Events

As the backbone of cities, infrastructures provide flows of resources and goods. Hazards can affect the basic functioning of the system causing losses in the performances of the infrastructures. Understanding the performances of the system during a natural hazard helps to improve the design of the infrastructure for a better resistance of the system as a whole. Here we investigate how flooding affects the topology of an infrastructure road network. The purpose of this paper is: 1) to characterise network properties for three flooding scenarios, 2) to analyse how spatial network properties (e.g. betweenness centrality) change due to different magnitude of the three flooding scenarios. We develop our analysis on the Zurich’s road network in 2012 and we model the scenarios using flooding risk maps. Based on the analysis we can 1) evaluate the losses of the system in terms of edges of the network, and 2) identify the topological changes of the system between the normal condition of the system and the three flooding scenarios, which is decisive for possible network improvements. The results can be used to identify which locations are important in terms of efficiency in the communication during flooding events. Future works could include traffic data in the analysis.

Ylenia Casali
Future Resilient Systems - Singapore ETH Centre
Singapore

Hans Heinimann
Future Resilient Systems Singapore-ETH Centre
Singapore

 

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