2134/36566
Yun Xing
Yun
Xing
Qiuhua Liang
Qiuhua
Liang
Gang Wang
Gang
Wang
Xiaodong Ming
Xiaodong
Ming
Xilin Xia
Xilin
Xia
City-scale hydrodynamic modelling of urban flash floods: the issues of scale and resolution
Loughborough University
2019
Urban flood modelling
Hydrodynamic model
High-resolution simulation
GPU
Intense rainfall
Typhoon
Built Environment and Design not elsewhere classified
Atmospheric Sciences
2019-01-14 11:37:24
Journal contribution
https://repository.lboro.ac.uk/articles/journal_contribution/City-scale_hydrodynamic_modelling_of_urban_flash_floods_the_issues_of_scale_and_resolution/9451187
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.