31a1b08f-9c5a-44cd-bcb7-5b02c3340c3e urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-10-16T11:22:32 creation ISO 19115 2016 Open source flood simulation with a 2D discontinuous-elevation hydrodynamic model 31a1b08f-9c5a-44cd-bcb7-5b02c3340c3e A new finite volume algorithm to solve the two dimensional shallow water equations on an unstructured triangular mesh has been implemented in the open source ANUGA software, jointly developed by the Australian National University and Geoscience Australia. The algorithm allows for 'discontinuous-elevation', or 'jumps' in the bed profile between neighbouring cells. This has a number of benefits compared with previously implemented 'continuous-elevation' approaches. Firstly it can preserve stationary states at wet-dry fronts, while also permitting simulation of very shallow frictionally dominated flow down slopes as occurs in direct-rainfall flood models. Additionally the use of discontinuous-elevation enables the sharp resolution of rapid changes in the topography associated with e.g. narrow rectangular drainage channels, or buildings, without the computational expense of a very fine mesh. The approach also supports a simple and computationally efficient treatment of river walls. A number of benchmark tests are presented illustrating these features of the algorithm, along with its application to urban flood hazard simulation and comparison with field data. External Publication Natural Hazards Published_External Link to Publication documentDigital Link to Publication PDF Unnamed resource documentDigital HTML