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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 22 Mar 2019

Research article | 22 Mar 2019

Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Hydrology and Earth System Sciences (HESS).

Scenario-based inundation analysis of metro systems: a case study in Shanghai

Hai-Min Lyu1, Shui-Long Shen1,2, Jun Yang3, and Zhen-Yu Yin4 Hai-Min Lyu et al.
  • 1State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean, and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • 2Department of Civil and Environmental Engineering, College of Engineering, Shantou Univ., Shantou, Guangdong 515063, China
  • 3Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong, China
  • 4Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China

Abstract. Catastrophic urban floods result in severe inundation of underground facilities in recent years. This paper presents an integrated approach in which an algorithm is proposed to integrate the storm water management model (SWMM) into the geographical information system (GIS) to evaluate the inundation risk. The proposed algorithm simulates the flood inundation of overland flow and metro station for each schemed scenario. It involves i) determination of the grid location and spreading coefficient and ii) iterative calculation of the spreading process. Furthermore, to evaluate the potential inundation risks of metro systems, an equation to qualitatively calculate the inundation depth around a metro station is proposed. This equation considered the drainage capacity and characteristics of each metro station. The proposed method is applied to simulate the inundation risks of the metro system in the urban centre of Shanghai under 50-year, 100-year, and 500-year scenarios. Both the inundation extent and depth are derived. The proposed method is validated by verifying from the records of historical floods. The results demonstrate that in case of the 500-year-rainfall scenario, for an inundation depth of over 300 mm, the inundated area is up to 5.16 km2, which is 4.3 % of the studied area and that there are four metro stations inundated to a depth of over 300 mm.

Hai-Min Lyu et al.
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Hai-Min Lyu et al.
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