source: anuga_work/production/hobart_2006/report/anuga.tex @ 3721

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hobart testing and report making

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1The software tool, ANUGA \cite{ON:modsim}, has been used to estimate
2the inundation extent
3and associated water level at various points in space and time.
4ANUGA has been developed by GA and the Australian National University
5(ANU) to solve the nonlinear shallow water
6wave equation using the finite volume technique\footnote{The finite volume
7technique belongs to the class of computational fluid dynamic (CFD)
8methods which is based on discretizing the study area in
9control ''volumes''. The method ensures that conservation
10of mass and horizontal momentum is satisfied for
11each control volume.
12An advantage of this technique is that the discretization
13can be changed
14according to areas of interest and that wetting and drying
15is treated robustly as part of the numerical scheme.}.
16ANUGA is continually being refined and validated to ensure
17the modelling approximations are as accurate as possible.
18However, model sensitivity to errors in bathymetric data,
19frictional resistance of the seafloor and the size of the tsunamigenic event are not well understood and the topic of ongoing research.
20As such, the current results are preliminary.
22The following information is required to undertake the
23inundation modelling;
26\item onshore and offshore elevation data (topographic and bathymetric data,
27see Section \ref{sec:data}),
28\item initial conditions, such as initial water levels (e.g. determined by tides),
29\item boundary conditions (the tsunami source as described in
30Section \ref{sec:methodology}), and
31\item computational requirements relating to the mesh construction.
34The initial conditions used for this scenario are MSL, HAT and LAT which were
35defined in Section \ref{sec:data}.
36The dynamics of
37tidal effects (that is, the changes in water height over time for
38the entire study area) are not currently modelled.
39Sea floor friction will generally provide resistance to the water flow
40and thus reduce the impact somewhat. However, limited
41research has been carried out to determine
42the friction coefficients, and
43thus it has not been incorporated
44in the scenario. The
45results are therefore likely to be over estimates.
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