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A GIS framework for evaluating the implications of urban road network failure due to earthquakes: Bucharest (Romania) case study

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Abstract

Through this paper we propose and test a GIS framework that addresses the issue of seismic risk due to urban road network failure. The approach relies on full GIS integration, on Monte Carlo simulations for generating potentially disrupted network configurations, considering also the damage probability due to direct earthquake implications, and on traffic considerations (both in typical and post-earthquake situations). The damage probability can be obtained using fragility functions for critical structures like bridges and tunnels or by determining empirically the possibility of affected buildings to generate debris leading to road obstruction. Multiple performance indicators such as travel time and distance under various conditions are combined, in order to quantify the risks inflicted by dysfunctionalities in the emergency intervention process. The framework considers at the same time temporal and spatial dimensions, being able to cope with traffic dynamics or reconfigurable network configurations. The ArcGIS Network Analyst Module is used for model integration, and full city scale analysis is performed in order to test the capabilities. Bucharest (capital of Romania) is selected for the case study; this 2 million inhabitant city is one of the most endangered in Europe, due to earthquakes that occur in the Vrancea Area, at intermediate depth, with moment magnitudes > 7, but also due to the vulnerable building stock. Beside this, it is one of Europe’s top cities when it comes to traffic congestion. The results of the study provide initial insights on the deficiencies of the city’s road network and connectivity limitations, showing the high impact of road obstructions and traffic congestion on intervention times, for ambulances and firefighters, in case of an earthquake.

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Acknowledgements

This work was supported by The Executive Unit for Financing the Higher Education and University Researches (UEFISCDI); through the NUCLEU CREATOR Programme, Project Nr. PN-16-35-02-03. We also acknowledge the contribution of the doctoral scholarship from Faculty of Geography, University of Bucharest.

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Authors and Affiliations

  1. National Institute for Earth Physics, 12 Calugareni, Magurele, Ilfov, Romania

    Dragos Toma-Danila

  2. Faculty of Geography, University of Bucharest, 1 Nicolae Balcescu Bd., Sector 1, Bucharest, Romania

    Dragos Toma-Danila

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  1. Dragos Toma-Danila
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Correspondence to Dragos Toma-Danila.

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Toma-Danila, D. A GIS framework for evaluating the implications of urban road network failure due to earthquakes: Bucharest (Romania) case study. Nat Hazards 93 (Suppl 1), 97–111 (2018). https://doi.org/10.1007/s11069-017-3069-y

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