Changeset 7529 for anuga_work/publications/boxing_day_validation_2008/data.tex

Timestamp:

Sep 23, 2009, 4:31:28 PM (16 years ago)

Author:

ole

Message:

Another stab at the bathymetry section

File:

• anuga_work/publications/boxing_day_validation_2008/data.tex (modified) (2 diffs)

anuga_work/publications/boxing_day_validation_2008/data.tex

@@ -76 +76 @@
 
 \subsubsection{Bathymetry Data}\label{sec:bathymetry data}
-The bathymetry data used in this study was derived from the following 
+The bathymetry data used in this study were derived from the following 
 sources:
 \begin{itemize}
@@ -88 +88 @@
   coastline constrained using SRTM data (\url{http://srtm.csi.cgiar.org}) 
   as well as Thai Navy charts no.\ 45 and no.\ 362; and  
-\item Thai Navy chart no.\ 358 providing water depths in Patong Bay. 
+\item Thai Navy chart no.\ 358 providing depth soundings inside Patong Bay. 
 \end{itemize}
 
-These data sets were combined via gridding, interpolation and resampling to produce
-four nested grids which are relatively coarse in the deeper water and
-progressively finer as the distance to shore Patong Beach decreases as
-shown in Figure~\ref{fig:nested_grids}. This progression was chosen
-to match model resolution requirements according to the principle that
-shallow water flows are more sensitive to variations in elevation data
-than deep water flows. Consequently, the elevation data in shallow
-waters and on-shore need to be resolved better than elevation data
-further off-shore.
-  
-The coarsest bathymetry was obtained by interpolating the DBDB2 grid
-to a 27~second arc grid. A subsection of this region was then replaced
-by nine second data which was generated by sub-sampling the three
-second of arc grid from NOAA. It is an artificially generated data set
-which is a subset of the original data.  A subset of the nine second
-grid was replaced by the three second data. Finally, a one arc second
-grid approximating the bathymetry in Patong Bay and the immediately
-adjacent regions was created by digitising Thai Navy bathymetry chart,
-no.\ 358. The digitised points and contour lines from this chart are
-shown in Figure~\ref{fig:patong_bathymetry}. The gridding was
-performed using \textsc{Intrepid}, a commercial geophysical processing
-package developed by Intrepid Geophysics\footnote{
-See
-\url{http://www.intrepid-geophysics.com/ig/manuals/english/gridding.pdf}
-for details on the Intrepid gridding scheme.}.
-Any points that deviated from the general trend near the boundary were
-deleted through a quality control process.
-The sub-sampling of larger grids was performed by using \textsc{resample},
-a Generic Mapping Tools (\textsc{GMT}) program \cite{wessel98}.
+These data sets were used to produce four nested grids as 
+shown in Figure~\ref{fig:nested_grids}. 
+The nested approach was chosen to match model resolution requirements
+according to the principle that shallow water flows are more sensitive
+to variations in elevation data than deep water flows. Consequently,
+the elevation data in shallow waters and on-shore need to be resolved
+better than elevation data further off-shore. 
+The four nested grids were derived as follows:
+\begin{itemize} 
+  \item \textbf{27~arc second grid} obtained by interpolating the two
+    minute DBDB2 grid. This is the coarsest grid used in the
+    simulations.
+  \item \textbf{9~arc second grid} generated by sub-sampling
+    the three second arc grid from NOAA.
+  \item \textbf{3~arc second grid} formed as a subset of the three second grid
+    from NOAA.
+  \item \textbf{1~arc second grid} created by digitising Thai Navy
+    bathymetry chart no.\ 358 followed by a gridding procedure as
+    described below. This grid is the smallest and 
+    covers the Bay area and immediately adjacent regions. 
+    The digitised points and contour lines
+    from this chart are shown in Figure~\ref{fig:patong_bathymetry}.
+\end{itemize} 
+    
+The gridding process for the finest grid was performed
+using \textsc{Intrepid}, a commercial geophysical processing
+package developed by Intrepid Geophysics\footnote{See
+  \url{http://www.intrepid-geophysics.com/ig/manuals/english/gridding.pdf}
+  for details on the Intrepid gridding scheme.}. Any points that
+deviated from the general trend near the boundary were deleted
+through a quality control process.  The sub-sampling of larger
+grids was performed by using \textsc{resample}, a Generic Mapping
+Tools (\textsc{GMT}) program \cite{wessel98}.