Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Nat. Hazards Earth Syst. Sci., 17, 205-224, 2017
http://www.nat-hazards-earth-syst-sci.net/17/205/2017/
doi:10.5194/nhess-17-205-2017
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
16 Feb 2017
Development of high-resolution multi-scale modelling system for simulation of coastal-fluvial urban flooding
Joanne Comer, Agnieszka Indiana Olbert, Stephen Nash, and Michael Hartnett Civil Engineering, College of Engineering and Informatics, Ryan Institute, National University of Ireland, Galway, University Road, Galway, Ireland
Abstract. Urban developments in coastal zones are often exposed to natural hazards such as flooding. In this research, a state-of-the-art, multi-scale nested flood (MSN_Flood) model is applied to simulate complex coastal-fluvial urban flooding due to combined effects of tides, surges and river discharges. Cork city on Ireland's southwest coast is a study case. The flood modelling system comprises a cascade of four dynamically linked models that resolve the hydrodynamics of Cork Harbour and/or its sub-region at four scales: 90, 30, 6 and 2 m.

Results demonstrate that the internalization of the nested boundary through the use of ghost cells combined with a tailored adaptive interpolation technique creates a highly dynamic moving boundary that permits flooding and drying of the nested boundary. This novel feature of MSN_Flood provides a high degree of choice regarding the location of the boundaries to the nested domain and therefore flexibility in model application. The nested MSN_Flood model through dynamic downscaling facilitates significant improvements in accuracy of model output without incurring the computational expense of high spatial resolution over the entire model domain. The urban flood model provides full characteristics of water levels and flow regimes necessary for flood hazard identification and flood risk assessment.


Citation: Comer, J., Olbert, A. I., Nash, S., and Hartnett, M.: Development of high-resolution multi-scale modelling system for simulation of coastal-fluvial urban flooding, Nat. Hazards Earth Syst. Sci., 17, 205-224, doi:10.5194/nhess-17-205-2017, 2017.
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Short summary
A state-of-the-art nested flood model (MSN_Flood) is applied to simulate complex coastal-fluvial urban flooding in order to critically examine the model’s capability to forecast evolution of urban inundation. The model demonstrates high accuracy of results without incurring the computational expense of high spatial resolution over the entire model domain. MSN_Flood provides full characteristics of water levels and flow regimes necessary for flood hazard identification and flood risk assessment.
A state-of-the-art nested flood model (MSN_Flood) is applied to simulate complex coastal-fluvial...
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