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Abstract
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 to metro systems; therefore, a better understanding of their vulnerability
would enhance their resilience. A comparative study of flood risk in metro 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
on May 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% of metro lines are highly exposed to flood risk, indicating
that the Guangzhou metro system is vulnerable to flood events. Comparisons between
results from AHP and I-AHP show that the latter yields a wider range of high flooding
risk than the former.