remote sensing Article Flood Risk Assessment of Subway Systems in Metropolitan Areas under Land Subsidence Scenario: A Case Study of Beijing Guangpeng Wang 1,2,3 , Yong Liu 1,2,3, Ziying Hu 1,2,3, Guoming Zhang 1,2,3, Jifu Liu 1,2,3, Yanli Lyu 1,2,3, Yu Gu 1,2,3, Xichen Huang 1,2,3, Qingyan Zhang 1,2,3 and Lianyou Liu 1,2,3,* 1 Key Laboratory of Environmental Change and Natural Disaster, Ministry of Education, Beijing Normal University, Beijing 100875, China;
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[email protected] (Q.Z.) 2 Engineering Research Center of Desertification and Blown-sand Control, Ministry of Education, Beijing Normal University, Beijing 100875, China 3 Faculty of Geographical Science, Academy of Disaster Reduction and Emergency Management, Beijing Normal University, Beijing 100875, China * Correspondence:
[email protected]; Tel.: +86-10-58802600 Abstract: Flooding is one of the most destructive natural events that severely damage the ground and inundate underground infrastructure. Subway systems in metropolitan areas are susceptible to flooding, which may be exacerbated when land subsidence occurs. However, previous studies have focused on flood risk evaluation on regional/watershed-scales and land subsidence monitoring in plains, instead of on subway flood risk evaluation and how land subsidence aggravates the flood risk in subway systems.