Abstract
Detailed full hydrodynamic 1D-2D dual drainage models are a well-established approach to simulate urban pluvial floods. However, despite modelling advances and increasing computational power, this approach remains unsuitable for many real time applications. We propose and test two computationally efficient surrogate models. The first approach links a detailed 1D sewer model to a GIS-based overland flood network. For the second approach, we developed a conceptual sewer and flood model using data-driven and physically based structures, and coupled the model to pre-simulated flood maps. The city of Ghent (Belgium) is used as a test case. Both surrogate models can provide comparable results to the original model in terms of peak surface flood volumes and maximum flood extent and depth maps, with a significant reduction in computing time.
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Acknowledgments
The authors would like to thank the Spanish Regional Government of Galicia (Postdoctoral grant ED481B 2014/156), Agentschap Innoveren en Ondernemen (Vlaio) for funding, Innovyze for the InfoWorks ICM license, and the water company Farys for the original 1D sewer model of the area. The research is conducted within the project PLURISK for the Belgian Science Policy Office.
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Bermúdez, M., Ntegeka, V., Wolfs, V. et al. Development and Comparison of Two Fast Surrogate Models for Urban Pluvial Flood Simulations. Water Resour Manage 32, 2801–2815 (2018). https://doi.org/10.1007/s11269-018-1959-8
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DOI: https://doi.org/10.1007/s11269-018-1959-8