Author(s): Krupka M.; Pender G.; Wallis S.; Sayers Pb; Mulet-Marti J.
Linked Author(s):
Keywords: Flood modelling; Raster; DEM; Storage cell
Abstract: Government flooding policy across Europe, and elsewhere, has switched from flood defence to flood risk management. This move to risk based analysis requires adopting a systems approach to the management of flood assets. Such an approach requires the evaluation of the consequences of all possible asset failures, e. g. breaching, overtopping or surcharging. For a typical flood system this necessitates the simulation of thousands of inundation permutations. As a consequence speed of simulation is a significant factor in the practical implementation of this approach. The paper reports progress on the on-going development of a rapid flood inundation prediction model designed to satisfy this requirement. The model makes use of high resolution remotely sensed digital elevation models. These are analysed to create a system of flood cells. The results of this precalculation are then used by the rapid inundation algorithm to compute water exchanges between flood cells and the maximum water level and depth over each pixel. The application of the method is demonstrated through the simulation of inundation on an urban floodplain. Ability to accurately predict the maximum inundation extent while maintaining a very short model run-time has been tested.
Year: 2007