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A GIS-based analysis of constraints on pedestrian tsunami evacuation routes: Cascais case study (Portugal)

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Abstract

Tsunami hazard in coastal areas susceptible to flooding, although reduced (in terms of probability of occurrence), may pose a high risk. Therefore, in these areas, a detailed evacuation planning of the affected population is required as a risk mitigation measure. The knowledge and enforcement of evacuation routes may reduce the population vulnerability, making it more resilient and reducing risk. This paper presents a GIS approach for modelling evacuation routes based on the optimal path search problem, of the graph theory, which is implemented on ArcCasper tool. The methodology proposed considers the elements involved in the evacuation process, the worst credible tsunami inundation scenario (hazard extent and travel time), the number of people that needs to be evacuated in different time scenarios, the safe areas or destination points of the evacuation routes, the roads network characteristics and finally the time available to evacuate. The knowledge of those elements allows predicting some possible outcomes of the evacuation, such as the arrival time of the evacuees to a shelter and the identification of congestion hot spots resulting from the application of a flocking model which simulates the path to be used by evacuees avoiding obstacles. The municipality of Cascais was used to test the methodology proposed in this study. Cascais is one of the largest urban centres located about 25 km west of Lisbon, Portugal, with a high density of infrastructure along the coastline whereby most of the population and economic activities are exposed to a tsunami. The results, presented in the form of maps, allow identifying the optimal evacuation routes as well as the unfeasible routes. This crucial information could be used to the evacuation optimization regarding the location of meeting points and vertical shelters as well as to improve the accessibility of the areas to be evacuated.

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Adapted from Shahabi (2015)

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. From Baptista and Omira (2014)

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Acknowledgements

This work was developed within the framework of INSPIRED and Baywatch projects, developed by the European Centre on Urban Risks (CERU) and financed by the European and Mediterranean Major Hazards Agreement (EUR-OPA) (Grant No. UID/GEO/50019/2013), Council of Europe.

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Authors and Affiliations

  1. CERU – European Centre on Urban Risks, Avenida Elias Garcia, n.º7, 2º, 1000-146, Lisbon, Portugal

    André Trindade & Paula Teves-Costa

  2. Instituto Dom Luiz, Faculdade de Ciências, Universidade de Lisboa, 1749-016, Lisbon, Portugal

    Paula Teves-Costa & Cristina Catita

Authors
  1. André Trindade
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  2. Paula Teves-Costa
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  3. Cristina Catita
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Correspondence to André Trindade.

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Trindade, A., Teves-Costa, P. & Catita, C. A GIS-based analysis of constraints on pedestrian tsunami evacuation routes: Cascais case study (Portugal). Nat Hazards 93 (Suppl 1), 169–185 (2018). https://doi.org/10.1007/s11069-017-3152-4

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  • DOI: https://doi.org/10.1007/s11069-017-3152-4

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