2020/10/05 by Janice Lynn Ayog, Ayog, Janice Lynn, Georges Kesserwani +7
Earth and Planetary Sciences · Environmental Science · #Computational Physics (physics.comp-ph) #FOS: Physical sciences #Flood Risk Assessment and Management #Hydrology and Watershed Management Studies #Tropical and Extratropical Cyclones Research
paper · pdf · doi:10.48550/arxiv.2010.02003
openalex publication_date 2020/10/05 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
Finite volume (FV) numerical solvers of the two-dimensional shallow water\nequations are core to industry-standard flood models. The second-order\nDiscontinuous Galerkin (DG2) alternative, although a viable way forward to\nimprove current FV-based flood models, is yet under-studied and rarely used to\nsupport flood modelling applications. This paper systematically explores and\ncompares the predictive properties of a robust DG2 flood model to those of\nprominent FV-based industrial flood models. To identify the simplest and most\nefficient DG2 configuration suitable for flood inundation modelling, two\nvariants - with and without local slope limiting - are considered. The\nnumerical conservation properties of the DG2 variants are compared to those of\na first-order FV (FV1) and a second-order FV (FV2) counterparts. The DG2\nvariants are then tested over five realistic flooding scenarios, recommended by\nthe UK Environment Agency to validate 2D flood model capabilities, while\ncomparing their performance against that of four FV-based commercial models\n(i.e. TUFLOW-FV1, TUFLOW-FV2, TUFLOW-HPC and Infoworks ICM). Results reveal\nthat the DG2 variant without local limiting (DG2-NL) is capable to simulate\nshockless flood flows featured in a wide range of flood modelling applications.\nThe DG2-NL shows closer predictions to commercial model outputs at\ntwice-coarser spatial resolution, and can run twice faster to produce more\ninformative hydrograph with small-scale transients over long-range simulations,\neven when the sampling is far away from the flooding source.\n