[2950] | 1 | The calculated run-up height and resulting inundation ashore is determined by |
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[3064] | 2 | the input topographic and bathymetric elevation, the forcing terms, the |
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| 3 | initial and boundary conditions, as well as the cell area of the computational |
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| 4 | mesh. |
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| 5 | Ideally, the data should adequately capture all complex features |
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| 6 | of the underlying bathymetry and topography and that mesh |
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[3098] | 7 | is commensurate with the underlying data, as discussed in |
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[3138] | 8 | Section \ref{sec:anuga}. Any limitations |
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[3064] | 9 | in the resolution and accuracy of the data will introduce |
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[3098] | 10 | errors to the inundation maps, in addition to the range of approximations |
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| 11 | made within the model. |
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[2950] | 12 | |
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[3064] | 13 | Data for this study have been sourced from a number of agencies. With |
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[2950] | 14 | respect to the onshore data, the Defence Imagery and Geospatial |
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| 15 | Organisation (DIGO) supplied the DTED (Digital Terrain Elevation |
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| 16 | Data) Level 2 data which has been authorised for Australian Tsunami |
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| 17 | Warning System use only. This data has a resolution of 1 second |
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| 18 | (about 30 metres), produced from 1:50 000 contours, elevations and |
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[3064] | 19 | drainage. In addition, the Department of Land Information (DLI) has provided a |
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| 20 | 20m DEM and orthophotography covering the NW Shelf. However, the 30m |
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[3098] | 21 | DTED Level 2 data is ``bare earth'' whereas the DLI data is distorted by |
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[3078] | 22 | vegetation |
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[3064] | 23 | and buildings so we have chosen to use the DTED as the onshore |
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| 24 | topographic data set. |
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[2950] | 25 | |
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| 26 | With respect to the offshore data, the Department of Planning and |
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[3064] | 27 | Infrastructure (DPI) have provided state digital fairsheet data around |
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[2950] | 28 | Onslow. This data covers only a very small geographic area. (Note, |
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[3064] | 29 | similar data has been provided for Pt Hedland and Broome by DPI.) |
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| 30 | The Australian Hydrographic Office (AHO) has supplied extensive |
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| 31 | fairsheet data which has also been utilised. |
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[2950] | 32 | |
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| 33 | In summary, |
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| 34 | |
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| 35 | \begin{center} |
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| 36 | \begin{tabular}{|l|l|}\hline |
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| 37 | Data & Detail \\ \hline |
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| 38 | DIGO DTED Level 2 & Onshore, 1 second $\approx$ 30m \\ \hline |
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| 39 | DLI & Onshore, 20m DEM and orthophotography \\ \hline |
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| 40 | DPI & Offshore, fairsheet data around Onslow \\ \hline |
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[3064] | 41 | AHO & Offshore, fairsheet data for North West Shelf region \\ \hline |
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[2950] | 42 | \end{tabular} |
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| 43 | \end{center} |
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| 44 | |
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| 45 | The coastline has been generated from the DIGO DTED Level 2 and modified |
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[3064] | 46 | using the aerial photography and two detailed surveys provided |
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[2950] | 47 | by WA Department of Planning and Infrastructure. |
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| 48 | |
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| 49 | The extent of the |
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| 50 | data used for the tsunami impact modelling can be seen in the |
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[3079] | 51 | Figure \ref{fig:onslowdataarea}. The study area covers approximately 100km |
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| 52 | of coastline |
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[3024] | 53 | and extends offshore to the 100m contour line and inshore to approximately 10m |
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| 54 | elevation. |
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[2950] | 55 | |
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| 56 | \begin{figure}[hbt] |
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| 57 | |
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[3079] | 58 | \centerline{ \includegraphics[width=100mm, height=75mm] |
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| 59 | {../report_figures/onslow_data_extent.png}} |
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[2950] | 60 | |
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[3079] | 61 | \caption{Data extent for Onslow scenario. Offshore data shown in blue |
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| 62 | and onshore data in green.} |
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| 63 | \label{fig:onslowdataarea} |
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[2950] | 64 | \end{figure} |
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| 65 | |
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| 66 | |
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[3078] | 67 | Section \ref{sec:metadata} provides more details and metadata for data used for |
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[2950] | 68 | this study. |
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| 69 | |
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