Testing a new two‐dimensional flood modelling system: analytical tests and application to a flood event

Abstract

Detailed testing of a new two‐dimensional hydraulic modelling system is presented. The methodology consists of applying the hydraulic model to a set of theoretical tests, for which analytical solutions are known, and then comparing a model simulation with a real flood event. The water‐at‐rest test, three dam‐break tests and the Seiche test constitute the set of tests with analytic solutions. The flood event is the Boscastle 2004 flood, for which observed water levels are available. The model yields results that compare closely with the analytical solutions in all of the tests, except for the Seiche test. When applied to the real flood event, the simulated maximum levels are close to the observed levels. Comparisons with two similar commercial software packages show similar results between the models.

A flood risk analysis model with topographical inundation and life-loss

“…There have, however, been developments in methods for multivariate extreme value analysis (Heffernan and Tawn, 2004) that can be applied in the context of flood risk to overcome these limitations (Keef et al, 2012;Lamb et al, 2010;Wyncoll and Gouldby, 2013). Additionally, it is now fairly commonplace within deterministic analysis to simulate the dynamic interaction of the river channels with the floodplain (Liang et al, 2007;Lhomme et al, 2010). Although the RFSM EDA model is able to improve the representation of this interaction through incorporation of dynamic losses from the floodplain, a dynamic two-way coupling is desirable.…”

“…shows a water level time-series comparison from the benchmark test 2A, of RFSM EDA with a 2D flood inundation model, that uses a more sophisticated finite-volume solution of the full shallow water equations (Infoworks ICM(Lhomme et al, 2010)). …”

Editorial

“…In engineering practice, use has been made of methods that represent a far greater level of approximation in order to achieve very fast simulations (i.e. HR Wallingford's rapid flood spreading method (Gouldby et al, 2008) and Halcrow's Isis Fast), while a number of consultants have adopted the full shallow water equations (Innovyze (Lhomme et al, 2010) and JBA Consulting (Crossley and Lamb, 2010)). More recently, research has been conducted on using sub-grid scale representations Lane, 2006a, 2006b) to increase accuracy while maintaining feasible computing time.…”

Developing a national programme of flood risk management measures: Moldova

“…The classic and widely-used method for river flood modelling is to use a one-dimensional (1D) representation for the river channels and a twodimensional (2D) representation for the floodplain [5][6][7]. This stems from two reasons:…”