ANUGA-A New Free Open Source Hydrodynamic Model

摘要

In December 2006, the Australian National University and Geoscience Australia released their 2D hydrodynamic model ANUGA to the free and open source software world. While initially developed to simulate coastal inundation by a tsunami or storm surge, ANUGA is a fully generalised hydrodynamic model with potential as a tool for simulation of any flow that is predominantly 2D in nature. Given this flexibility, the Authors of this paper became interested in and have trialled the model as a conventional hydrodynamic 2D flood model on both a complex urban system and a simpler rural system. This paper presents their findings in terms of the complexity in constructing and running these two trial models and comments on ANUGA's applicability to flood modelling generally. The urban model included a dam break scenario with floodwater passing through a residential area. The ability to construct a model with elements varying in size to suit the features being modelled permitted flow behaviour to be simulated realistically and at a level of local detail that structured grid models cannot practically reproduce ANUGA is mostly coded in Python, a very powerful but easy to learn (free and open source) object oriented language. As such, extensions or amendments to the model are very easy to develop and implement. The authors have recently added the ability to model distributed rainfall and infiltration and are currently exploring options for accommodating underground networks and structures such as bridges and culverts. The paper concludes that ANUGA is a model worthy of serious consideration whenever a problem arises involving simulation of flooding in streams, estuaries or as a result of coastal inundation.