Flood risk assessment in metro systems of mega-cities using a GIS-based modeling approach

Metro system is a vital component of mass transportation infrastructure, providing crucial social and economic service in urban area. Flood events may cause functional disruptions tometro systems; therefore, a better understanding of their vulnerability would enhance their resilience. A comparative study of flood risk inmetro systems is presented using the analytic hierarchy process (AHP) and the interval AHP (I-AHP) methods. The flood risk in the Guangzhou metro system is evaluated according to recorded data. Evaluated results are validated using the flood event occurred in Guangzhou onMay 10, 2016 (hereinafter called May 10th event), which inundated several metro stations. The flood risk is assessed within a range of 500 m around the metro line. The results show that >50% ofmetro lines are highly exposed to flood risk, indicating that the Guangzhou metro systemis vulnerable to flood events. Comparisons between results fromAHP and I-AHP showthat the latter yields a wider range of high flooding risk than the former. (C) 2018 Elsevier B.V. All rights reserved.