| 1 | The software tool, ANUGA \cite{ON:modsim}, has been used to estimate |
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| 2 | the inundation extent |
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| 3 | and associated water level at various points in space and time. |
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| 4 | ANUGA has been developed by GA and the Australian National University |
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| 5 | (ANU) to solve the nonlinear shallow water |
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| 6 | wave equation using the finite volume technique\footnote{The finite volume |
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| 7 | technique belongs to the class of computational fluid dynamic (CFD) |
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| 8 | methods which is based on discretizing the study area in |
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| 9 | control ''volumes''. The method satisfices conservation |
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| 10 | of mass, momentum and energy and is exactly satisfied for |
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| 11 | each control volume. |
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| 12 | An advantage of this technique is that the discretization |
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| 13 | can be changed |
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| 14 | according to areas of interest and that wetting and drying |
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| 15 | is treated robustly as part of the numerical scheme.}. |
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| 16 | ANUGA is continually being developed and validated to ensure |
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| 17 | the modelling approximations reflect new theory or |
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| 18 | available experimental data sets. |
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| 19 | As such, the current results are preliminary. |
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| 20 | |
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| 21 | The following information is required to undertake the |
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| 22 | inundation modelling; |
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| 23 | |
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| 24 | \begin{itemize} |
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| 25 | \item onshore and offshore elevation data (topographic and bathymetric data, |
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| 26 | see Section \ref{sec:data}), |
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| 27 | \item initial conditions, such as initial water levels (e.g. determined by tides), |
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| 28 | \item boundary conditions (the tsunami source as described in |
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| 29 | Section \ref{sec:tsunamiscenario}), and |
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| 30 | \item computational requirements relating to the mesh construction. |
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| 31 | \end{itemize} |
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| 32 | |
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| 33 | The initial conditions used for this scenario are MSL, HAT and LAT which |
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| 34 | are defined in Section \ref{sec:data}. |
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| 35 | The dynamics of |
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| 36 | tidal effects (that is, the changes in water height over time for |
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| 37 | the entire study area) are not currently modelled. |
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| 38 | Sea floor friction will generally provide resistance to the water flow |
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| 39 | and thus reduce the impact somewhat. However, limited |
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| 40 | research has been carried out to determine |
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| 41 | the friction coefficients, and |
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| 42 | thus it has not been incorporated |
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| 43 | in the scenario. The |
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| 44 | results are therefore likely to be over estimations. |
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| 45 | |
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