Modelling Community Evacuation Vulnerability Using GIS

We present a method for systematically identifying neighbourhoods that may face transportation di Yculties during an evacuation. A classi® cation of this nature o Vers a unique approach to assessing community vulnerability in regions subject to fast-moving hazards of uncertain spatial impact (e.g., urban ® restorms and toxic spills on highways). The approach is founded on an integer programming (IP) model called the critical cluster model (CCM). An heuristic algorithm is described which is capable of producing e Ycient, high-quality solu- tions to this model in a GIS context. The paper concludes with an application of the method to Santa Barbara, California.

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