![]() The study area is represented by a mesh of triangular cells that can vary in size in order to capture detail where it is required. The fluid dynamics in ANUGA are based on a Finite volume method for solving the Shallow Water Wave Equation. ANUGA ran this model with full volumetric mass balance preserved at all times and no instabilities anywhere in the model. An example of this is the 1928 St Francis Dam Break in California that resulted in extreme flow velocities and complex waves in a tortuous valley. ANUGA is stable even in extreme flow with high Froude numbers. Development continues to create an arbitrary shape culvert solver and linking to a 1D piped network model such as SWMM. ANUGA can model culverts and bridges with code from the open source Watershed Bounded Network Model (WBNM), having a pipe, box and trapezoid routine. This is particularly useful for applying RADAR rainfall. Alternatively a rainfall grid can be applied. A time series can be applied to a polygon, or a series of polygons. This allows rainfall to be placed directly over the topography described in the computational domain. In 2007 after approaches from Local Government Engineers, a rainfall routine was added. The first public open source release of ANUGA took place in December 2006. Although the initial aim of ANUGA was a capability to model inundation from storm surge events, the focus was redirected to tsunami inundation in the wake of the 2004 Indian Ocean earthquake and tsunami. Based on research conducted at the Australian National University in the nineties, the development of ANUGA was commenced at Geoscience Australia in 2004. Geoscience Australia and the Australian National University have developed a freely available hydrodynamic inundation modelling tool called ANUGA to help simulate the impact of these hazards. Modelling the effects on the built environment of natural hazards such as riverine flooding, storm surges and tsunami is critical for understanding their economic and social impact on our urban communities. 1.8 ANUGA development ideas for the future.1.6 ANUGA software development methodology. ![]()
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