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

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

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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
Depositing User: Unnamed user with email i.services@hrwallingford.com
Date Deposited: 02 Apr 2020 09:49
Last Modified: 02 Apr 2020 09:49
URI: http://eprints.hrwallingford.com/id/eprint/859

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