Changeset 2991

May 27, 2006, 7:23:19 PM (18 years ago)


2 edited


  • production/onslow_2006/

    r2983 r2991  
    173173# Generate latex output for gauges
    174 s = '\\begin{center} \n \\begin{tabular}{|l|l|l|}\hline \n \\bf{Gauge Name} & \\bf{Easting} & \\bf{Northing} \\\\ \hline \n'
    175 fid.write(s)
    177 gauges, locations = get_gauges_from_file(project.gauge_filename)
     174s = '\\begin{center} \n \\begin{tabular}{|l|l|l|}\hline \n \\bf{Gauge
     175Name} & \\bf{Easting} & \\bf{Northing} \\\\ \hline \n' fid.write(s)
     176#s = '\\begin{center} \n \\begin{tabular}{|l|l|l|l|}\hline \n \\bf{Gauge
     177#Name} & \\bf Easting} & \\bf Northing} & \\bf Elevation \\\\ \hline \n
     179gauges, locations =
    179182for name, gauges in zip(locations, gauges):
    180183    east = gauges[0]
    181184    north = gauges[1]
    182     s = '%s & %.2f & %.2f \\\\ \hline \n' %(name.replace('_',' '), east, north)
     185    #elev = gauges[2]
     186    s = '%s & %.2f & %.2f \\\\ \hline \n' %(name.replace('_',' '), east,
     188    #s = '%s & %.2f & %.2f & %.2f \\\\ \hline \n %(name.replace('_',' '),
     189east, north, elev)
    183190    fid.write(s)
  • production/onslow_2006/report/interpretation.tex

    r2983 r2991  
    11The following subsections detail the time series at select locations
    2 for high, low and zero tide conditions. These locations have
    3 been chosen to assist in describing the features of the tsunami wave
    4 and the resultant impact ashore. It is evident from \ref{fig:ic_high}
    5 that the DEM ...
     2for Highest Astronomical Tide (HAT), Lowest Astronomical Tide (LAT) and
     3Mean Sea Level (MSL) conditions. These locations
     4have been chosen to assist in describing the features of the tsunami wave
     5and the resultant impact ashore. Here, we assume that MSL coincides with
     6AHD zero. This is a standard assumption and confirmed with the WA DLI (check
     7where Ric is from). The graph ranges for both stage and
     8velocity are made consistent for each of comparison. In addition, velocities
     9under 0.001 m/s are not shown. As a useful benchmark, the following table
     10describes typical values of velocity and corresponding examples.
     14Velocity (m/s) & Example \\ \hline
     151 & \\ \hline
     162 & \\ \hline
     175 & \\ \hline
     1810 & \\ \hline
     22It is evident from \ref{fig:ic_high}
     23that much of Onslow would be inundated at Highest Astronomical Tide (HAT)
     24(1.5m above MSL).
     25HAT is the projected tide on a 19 year cycle, and Mean High Water Springs
     26(MHWS) is the tide which is projected to occur on a yearly cycle. The
     27Australian National Tidal Tables 2006 determines MHWS for Onslow to be 1m
     28(adjusted to AHD) which also places regions within the study area under
     29water before a tsunami wave reaches the shore. Using HAT or even
     30MHWS in this way has significant infrastructure inundated which does not
     31seem reasonable. Therefore, we show results for MSL only and
     32provide a
     33qualitative discussion on the changes to the inundation at HAT and LAT. 
     35Hamish - does the Onslow coastline coincide with teh yellow bit on the
     36Onslow map? If so, does that place AHD 0 at MHWS? Regardless, this
     37doesn't help what would happen at Pt Hedland.
     39Nick/DB - In comparing ANUGA to MOST etc, what's DB using? If looking OK,
     40that probably means that we're saying AHD 0 = MSL.
     42ANUGA question - why would say Bindi Bindi which has an elevation of
     43around .8m start with 1.5m stage? Dam overflow gauge elevation around
     442.4m and IC = 2.45m ... Light Tower gauge elevation around 1.m and IC
     45around 1.45m ... Could we add 1.5m to the boundary condition instead and
     46propagate the water from there?
     48The Australian Hydrographic Office fair sheet for Onslow describes the
     49chart datum to be LAT with MSL and HAT being 1.5 and 3 respectively. This
     50then places HAT and LAT at 1.5 AHD and -1.5 AHD respectively. Other
     51detail on the chart describes the blah de blah mark to be MHWS.
     53Depending on what the following figures look like, we may need to use the
     54other data rather than the DTED.
     80Examining the offshore gauges, the drawdown prior to the tsunami wave
     81arriving at the shore can be seen to occur around 14000 secs (convert to
     82mins) (x hours) after the tsunami wave penetrates the boundary (Nick - is
     83this right?).
     84Prior to the drawdown, maximum amplitudes are approximately 50cm at
     85West of Groyne and the mouth of Beadon Creek, for example. The first wave
     86after the drawdown ranges from approximatly 2m in the
     87west of Beadon Bay to 1.5m in the east of Beadon Bay. The velocity
     88sharply increases at drawdown with further increases as the
     89wave grows in amplitude.
     90There is an increased amplitude of approximately 3m found in
     91east of Beadon Bay for the secondary wave, as opposed to the first wave.
     92This feature is also evident at the West of Groyne location.
     93This may be due to the geography of the bay, including the groyne west of
     94the creek mouth opening, the local bathymetry
     95and the direction of the tsunami wave.
    32 What are the features of the tsunami wave?
    33 direction? multiple waves? amplitude offshore?
     97The maximum velocity found for the offshore gauges occurs at the West of
     98Groyne location with velocities halved at the Beadon Bay west location.
     99The Beadon Bay west velocity is greater that the gauge in the east of Beadon
     100Bay. There is similar differences in amplitude (from drawdown to maximum
     101amplitude), however, the west gauge is in deeper water than the east
     102gauge which may indicate the increased velocity found in the east of the
    35 It is evident for each simulation that the sand dunes west of Onslow
    36 are very effective in halting the tsunami wave. The height of these
     105Subsequent drawdowns are seen as the multitude of waves which make up the
     106event propagate towards the shore.
     109At some gauge locations, these
     110subsequent waves cause significantly increased inundation than that of
     111the first wave. This is particularly seen at the Beadon Creek Docks,
     112West of Groyne and Beadon Creek locations.
     115It is evident for each simulation that the sand dunes west of
     116Onslow are very effective in halting the tsunami wave. The height of these
    37117sand dunes are approximately 10m which is more than enough to halt
    38118the largest of the tsunami waves which occurs for the
    59139There is significant inundation of at
    60 least 2m on the foreshore of Onslow for zero and high tide.
     140least 2m on the foreshore of Onslow for MSL and HAT.
    61141The inundation extent increases as the tide rises, pushing the edges
    62142of the majority of the road infrastructure in the Onslow town centre.
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