City-scale hydrodynamic modelling of urban flash floods: the issues of scale and resolution

Yun Xing, Qiuhua Liang (), Gang Wang, Xiaodong Ming and Xilin Xia
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Yun Xing: Coastal and Offshore Engineering, Hohai University
Qiuhua Liang: Coastal and Offshore Engineering, Hohai University
Gang Wang: Coastal and Offshore Engineering, Hohai University
Xiaodong Ming: Newcastle University
Xilin Xia: Loughborough University

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2019, vol. 96, issue 1, No 22, 473-496

Abstract: Abstract Hydrodynamic models have been widely used in urban flood modelling. Due to the prohibitive computational cost, most of urban flood simulations have been currently carried out at low spatial resolution or in small localised domains, leading to unreliable predictions. With the recent advance in high-performance computing technologies, GPU-accelerated hydrodynamic models are now capable of performing high-resolution simulations at a city scale. This paper presents a multi-GPU hydrodynamic model applied to reproduce a flood event in a 267.4 km2 urbanised domain in Fuzhou, Fujian Province, China. At 2 m resolution, the simulation is completed in nearly real time, demonstrating the efficiency and robustness of the model for high-resolution flood modelling. The model is used to further investigate the effects of varying spatial resolution and using localised domains on the simulation results. It is recommended that urban flood simulations should be performed at resolutions higher than 5 m and localised simulations may introduce unacceptable numerical errors.

Keywords: Urban flood modelling; Hydrodynamic model; High-resolution simulation; GPU; Intense rainfall; Typhoon (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (5)

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DOI: 10.1007/s11069-018-3553-z

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