Validation of a Computationally Efficient 2D Inundation Model on Multiple Scales

Validation of a Computationally Efficient 2D Inundation Model on Multiple Scales.
Jamieson, S.and Wright, G. and Lhomme, J. and Gouldby, B.P.
In: FLOODrisk 2012, 20-22 November 2012, Rotterdam. (2012)

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Abstract:RFSM-EDA (Rapid Flood Spreading Method – Explicit Diffusion wave with Acceleration term) is a 2D inundation model that has recently been developed for the purpose of making broad-scale inundation predictions, using a coarse grid-resolution whilst still maintaining a fine topographic representation. It can run the type of rapid, yet accurate, simulations required for region-wide mapping and probabilistic predictions. This is made possible by using an innovative sub-element Impact Zone schematisation and modifying a new approximation to the shallow water equations. RFSM-EDA has previously performed well on the UK Environment Agency’s 2D hydraulic benchmarking tests, with a significant computational speed advantage in most cases. This paper introduces a new approach to calculating the interface fluxes, and investigates the im-pact on simulation runtime and accuracy. The model is again tested on one of the benchmark tests before be-ing applied to a more appropriate large scale site, where it is compared with an industry standard 2D inunda-tion model with an equivalent computational mesh resolution. The new interface flux method is found to substantially improve efficiency without compromising predictive accuracy, and RFSM-EDA is shown to be very computationally efficient and highly accurate for all but the shallowest of depths.
Item Type:Conference or Workshop Item (Paper)
Subjects:Floods > General
ID Code:636
Deposited On:21 Mar 2013 14:16
Last Modified:06 Feb 2018 13:14

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