To initiate the modelling, the computational mesh is constructed to
cover the available data. The resolution is chosen to balance
computational time and desired resolution in areas of interest,
particularly in the interface between the on and offshore. he
following figure illustrates the data extent for the 
scenario and where further mesh refinement has been made. The choice
of the refinement is based around the important inter-tidal zones and
other important features such as islands and rivers.
The resultant computational mesh is then seen in \ref{fig.mesh_onslow}.


\begin{figure}[hbt]

  \centerline{ \includegraphics[width=75mm, height=75mm]{pt_hedland_data_poly.png}}

  \caption{Study area for Pt Hedland scenario}
  \label{fig:pt_hedland_area}
\end{figure}


\begin{figure}[hbt]

  %\centerline{ \includegraphics[width=75mm, height=75mm]{}}

  \caption{Computational mesh for Pt Hedland study area}
  \label{fig:mesh_pthedland}
\end{figure}
