Changeset 3235

Timestamp:

Jun 26, 2006, 3:39:12 PM (19 years ago)

Author:

sexton

Message:

yet more updates

Location:

production/onslow_2006/report

Files:

• anuga.tex (modified) (1 diff)
• computational_setup.tex (modified) (3 diffs)
• damage.tex (modified) (3 diffs)
• discussion.tex (modified) (1 diff)
• interpretation.tex (modified) (1 diff)
• modelling_methodology.tex (modified) (1 diff)
• summary.tex (modified) (1 diff)

production/onslow_2006/report/anuga.tex

@@ -38 +38 @@
 in the scenario presented in this report. Therefore, the 
 results presented are over estimated to some degree.
+

production/onslow_2006/report/computational_setup.tex

@@ -41 +41 @@
 In addition, the data is not necessarily complete, as can be
 seen in Figure \ref{fig:onslow_area}.
+
 In the deep water modelling such as MOST,
 the minimum model resolution is chosen so that there at
@@ -87 +88 @@
 and continues to propagate the wave in shallow water and onshore. 
 To illustrate the form of the tsunami wave, we show the 
-tsunami wave moving through the point locations
-(Figure \ref{fig:MOSTsolution}(a)). This time history is
-shown as a surface in Figure \ref{fig:MOSTsolution}(b).
+tsunami wave moving through the point locations shown in 
+Figure \ref{fig:MOSTsolution} as a surface showing the wave's
+amplitude as a function of its spatial location and time.
 
 
@@ -98 +99 @@
 \includegraphics[width=0.49\linewidth, height=50mm]{../report_figures/solution_surfaceMOST.png}\\ 
 \end{tabular} 
- \caption{(1) Point locations used to illustrate form of tsunami wave. 
-(2) Time hisorty of tsunami wave)} 
+ \caption{Point locations used to illustrate the form of the tsunami wave and the
+corresponding surface function.} 
  \label{fig:MOSTsolution} 
  \end{figure} 

production/onslow_2006/report/damage.tex

@@ -19 +19 @@
 housing survey}. 
 
-Impact on indigeneous communities are important considerations when determining
-tsunami impact, especially as a number of communities exist in coastal regions.
-These communities are typically not included in national residential databases 
-and would be therefore overlooked in damage model estimates.
-There is one indigeneous community located in this study area as seen
-in Figure
-\ref{fig:points}. The population of the Bindibindi community is 140 
-and is situated close to the coast as seen in Figure \ref{fig:points}.
-At 0m AHD, over 2m of water will inundate parts of the community (Figure 
-\ref{fig:fig:20060515001733gaugeBindiBindiCommunity}) 
-indicating 100\% damage of contents.
 
 To develop building damage and casuality estimates, we briefly describe 
@@ -60 +49 @@
 for the structure, the water depth with respect to 
 sleeping height (1.0 m) and the limited warning noise for people 
-in the first three city blocks (6 house rows) that could potentially 
+in the first three city blocks (six house rows) that could potentially 
 awaken them. The three injury categories corresponded with the 
 categories presented in HAZUS-MH \cite{NIBS:2003} for earthquake 
@@ -112 +101 @@
 \end{table}
 
-discussion on Mary's outputs
 
+Impact on indigeneous communities are important considerations when determining
+tsunami impact, especially as a number of communities exist in coastal regions.
+These communities are typically not included in national residential databases 
+and would be therefore overlooked in damage model estimates.
+There is one indigeneous community located in this study area as seen
+in Figure
+\ref{fig:points}. The population of the Bindibindi community is 140 
+and is situated close to the coast as seen in Figure \ref{fig:points}.
+At 0m AHD, over 2m of water will inundate parts of the community (Figure 
+\ref{fig:20060515001733gaugeBindiBindiCommunity}) 
+indicating 100\% damage of contents.

production/onslow_2006/report/discussion.tex

@@ -2 +2 @@
 As part of the CRA, it was decided to provide results for the
 extremes of the tidal regimes to understand the potential range of impacts 
-from the event. Onslow is termed a Standard Port
-by the Australian Hydrographic Service, with tidal
-predictions based on continuous observation of the tide
-over a period of at least one year, however it is advised that these
-observations extend to three years to note changes in the mean
-sea level. The Australian National Tide Tables 2006 \cite{antt:06}
-describes how
-these predictions are rounded to two decimal places, then
-further rounded to a single decimal place. 
+from the event. The Highest Astronomical Tide (HAT) and Lowest
+Astronomical Tide (LAT) are defined as 1.5m AHD and -1.5m AHD 
+respectively for Onslow, \cite{antt:06}. These values are tidal
+predictions based on continous tidal observations from Standard Ports
+over a period of
+at least one year, with the Australian Hydrographic Service
+recommending this be extended to three years to capture
+changes to the mean sea level. Onslow is listed as
+a Standard Port. These predictions are ultimately rounded on a single
+decimal place.
+
 Figure \ref{fig:contours} shows the contour lines for
-the values for
-Highest Astronomical Tide (HAT; 1.5m AHD), Mean Sea Level (MSL; 0m AHD) 
-and Lowest Astronomical Tide (LAT; -1.5m AHD) for Onslow, \cite{antt:06}.
+the HAT, MSL and LAT for Onslow.
 It is evident from this figure that the extent of the tidal
-inundation is exaggerated. This is due to
-short comings with the digital elevation model which has been 
+inundation is exaggerated which is due to
+short comings with the digital elevation model (DEM). The DEM has been 
 derived from 20m contour lines. {\bf Need some words from hamish here.}
 

production/onslow_2006/report/interpretation.tex

@@ -47 +47 @@
 (Figure \ref{fig:20060515001733gaugeBeadonCreekmouth}), for example. 
 The first wave 
-after the drawdown ranges from approximatly 2m in the 
+after the drawdown ranges from approximately 2m in the 
 west of Beadon Bay (Figure \ref{fig:20060515001733gaugeBeadonBaywest})
 to 1.5m in the east of Beadon Bay 

production/onslow_2006/report/modelling_methodology.tex

@@ -23 +23 @@
 of hundreds of metres, which is sufficient to model long wavelength tsunami waves. 
 Non-linear models by contrast require much finer resolution in order to capture
-the complexity associated the water flow from off to onshore. The data
-resolution is typically of the order of tens of metres.
+the complexity associated with the water flow from off to onshore. By contrast, the data
+resolution required is typically of the order of tens of metres.
 The model ANUGA (\cite{ON:modsim}) is suitable for this type of non-linear
 modelling.

production/onslow_2006/report/summary.tex

@@ -1 +1 @@
 
-Further modelling effort is required in the next financial year to 
-investigate the solution sensitivity to cell resolution, 
-bathymetry and tsunami source uncertainties. 
-Further investigation of the point at which
-ANUGA can use the deep water model output is also required as well
-as incorporating appropriate friction coefficients.s
+This report has described the impact to Onslow from a Mw 9 earthquake
+generated from the Sunda Arc subduction zone occurring at
+Mean Sea Level. 
+There is no knowledge of the return period for this event. 
+As discussed in Section \ref{sec:discussion}, there are issues
+with the underlying data set which may have vertical inaccuracies
+of approximately 1-2m. As a result, these results should be considered
+preliminary. 
+These scenarios will be revisited once the probabilistic models
+are complete so that a suite of tsunami impact assessments can be made.
+It is therefore imperative that suitably accurate onshore data
+be made available to raise confidence in the impact assessments.
+
+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
+\item Investigation of friction coefficients
+\end{itemize}
+
+