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

Hai-Min Lyu; Wen-Juan Sun; Shui-Long Shen; Arul Arulrajah

doi:10.1016/j.scitotenv.2018.01.138

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

Sci Total Environ. 2018 Jun 1:626:1012-1025. doi: 10.1016/j.scitotenv.2018.01.138. Epub 2018 Feb 19.

Authors

Hai-Min Lyu¹, Wen-Juan Sun², Shui-Long Shen³, Arul Arulrajah⁴

Affiliations

¹ State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean, and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE), Shanghai Jiao Tong University, Shanghai 200240, China. Electronic address: lvhaimin@sjtu.edu.cn.
² Department of Civil and Environmental Engineering, Lehigh University, Bethlehem, PA 18015, USA.
³ State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean, and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE), Shanghai Jiao Tong University, Shanghai 200240, China. Electronic address: slshen@sjtu.edu.cn.
⁴ Department of Civil and Construction Engineering, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia. Electronic address: aarulrajah@swin.edu.au.

PMID: 29898510
DOI: 10.1016/j.scitotenv.2018.01.138

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.

Keywords: Flood risk assessment; GIS; I-AHP; Metro system.