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.