source: production/onslow_2006/report/interpretation.tex @ 2983

The following subsections detail the time series at select locations
for high, low and zero tide conditions. These locations have
been chosen to assist in describing the features of the tsunami wave
and the resultant impact ashore. It is evident from \ref{fig:ic_high}
that the DEM ...

\begin{figure}[hbt]

  %\centerline{ \includegraphics[width=100mm, height=75mm]{../report_figures/.png}}

  \caption{Initial condition for mean sea level.}
  \label{fig:ic_zero}
\end{figure}

\begin{figure}[hbt]

  %\centerline{ \includegraphics[width=100mm, height=75mm]{../report_figures/.png}}

  \caption{Initial condition for lowest astronomical tide.}
  \label{fig:ic_low}
\end{figure}

\begin{figure}[hbt]

  %\centerline{ \includegraphics[width=100mm, height=75mm]{../report_figures/.png}}

  \caption{Initial condition for highest astronomical tide.}
  \label{fig:ic_high}
\end{figure}


What are the features of the tsunami wave?
direction? multiple waves? amplitude offshore?

It is evident for each simulation that the sand dunes west of Onslow
are very effective in halting the tsunami wave. The height of these
sand dunes are approximately 10m which is more than enough to halt
the largest of the tsunami waves which occurs for the
high tide simulation. There is inundation between the sand dunes at high 
tide, however, this water penetrated from the north east (via
Onslow town cetnre) rather than seaward.
The same feature is evident for the sand dunes east of Onslow which
rise to 15m in height. Currently, ANUGA can not model changes 
to the bathymetry or topography due to effects of the water flow. 
Therefore, we do not know whether these sand dunes would withstand the
transmitted energy of the tsunami wave. 

The wave penetrates the river east of Onslow with increasingly
greater inundation as the tide changes from LAT to HAT.

As expected, there is greater inundation at high tide. The major road
into Onslow, the Onslow Mount Stuart Rd, remains free of inundation for
all tidal scenarios. Beadon Creek Rd which services the wharf in the
river becomes increasingly inundated as the tide rises. Only the
entry to the wharf on Beadon Creek Rd is sufficiently inundated at LAT
to stop traffic. At HAT however, essentially the entire road 
would be impassable.

There is significant inundation of at
least 2m on the foreshore of Onslow for zero and high tide.
The inundation extent increases as the tide rises, pushing the edges
of the majority of the road infrastructure in the Onslow town centre.