source: anuga_work/production/hobart_2006/report/summary.tex @ 3855

This report has described the impact on Onslow from a tsunami
generated by a Mw 9 earthquake on the Sunda Arc subduction zone 
occurring at Highest Astronomical Tide, Lowest Astronomical Tide
and Mean Sea Level. 
As yet, there is no knowledge of the return period for this event. The
modelling methodology, assumptions and data sources for the Onslow 
scenario have also been described. 

As shown in Section \ref{sec:data}, it is imperative
that the best available data is used to increase confidence
in the inundation maps. 
Given that the Highest Astronomical Tide contour
line is further from the coast for the DTED data than the DLI data, we
expect the inundation to extend further and thus be greater than
that seen in Figure \ref{fig:MSL_max_inundation}. 
The impact modelling
will result in significantly inflated structural and contents loss figures as well as
numbers of people affected.
These results strongly point to the need for the best 
available data so that more accurate predictions regarding the 
inundation can be made.
An onshore grid resolution of the order
of tens of metres is required, however, it is more important that the data
are accurate (or at least well known).

These scenarios will be revisited once the probabilistic models
are complete so that a suite of tsunami impact assessments can be made.
Future activities to support the impact studies on the North West Shelf
include:

\begin{itemize}
\item Sourcing of data sets,
\item Investigation of solution sensitivity to cell resolution,
bathymetry and tsunami source uncertainties,
\item Location of boundary for simulation study area, and
\item Investigation of friction coefficients.
\end{itemize}