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Rio Tinto AlcanEnvironmental Impact StatementSouth of <strong>Embley</strong> ProjectLEGENDStorm tide gaugeDERM wave buoyBeacon 886600008650000Beacon 2Acoustic Doppler Current Profiler864Q0008630000-6620000 =86100008600000WeipaE85900002 858000008570000-8560000-SoE Port site8550000854000085300008520000 j85100008500000480000II.I,....II.,,,,,,500000 520000 540000 560000 580000 600000EastingBalhymetryAbove-4-I-1 -8 - 4Al -12- -a- 18 - -12I= -20 1824 -2028 -24- 32 - -28-36 32- -35I= -44 - -40- 48 --44- 52 --48MI -56 -52Below -58Undefined ValueFigure 6-3Inner Model Flexible Mesh Bathymetry and Model Boundaries withObservational Data Locations.The Outer (Gulf) model has two open boundaries (refer Figure 6-2):the western boundary, which extends from Cape Wessel to the south-western tip ofDolak Island; andthe eastern boundary, which extends from Shelbourne Bay to Bramble Cay.Global tide model predictions, incorporating the major tidal constituents, were obtained at theouter model open boundary extents and are presented in Figure 6-4. The timing andmagnitude of the tidal water level over the length of each open boundary was expected toshow variation. This was represented in the model by applying a linear variation in predictedtide level between:Cape Wessel and Dolak Island for the western boundary; andShelbourne Bay and Bramble Cay for the eastern boundary.Section 6 Marine Page 6-4
Rio Tinto AlcanEnvironmental Impact StatementSouth of <strong>Embley</strong> Project2.0Cape Wessel trnjDolak Island [m]Shethoume Bay [m]Bramble Cay [m]1.0E0.0Co7C0 -1.0IA,p -2.0,r)-3.0-4.000:00 00:00 00:00 00:00 00:00 00:00 00:002007-05-22 05-24 05-26 05-28 05-30 05-01 06-03Figure 6-4Global Tide Model Prediction at Outer Model Open Boundary ExtentsAcoustic Doppler Current Profiler (ADCP) instrument deployment at the proposed port site(location indicated in Figure 6-3) provided measurements of current speed, current direction,and water level useful for hydrodynamic model verification. Additional water level data for theWeipa region collected by the Queensland Department of Environment and ResourceManagement (DERM, formerly the Queensland Environmental Protection Agency, EPA) wasprovided by Maritime Safety Queensland (MSQ). The data included both the Weipa storm tidegauge predictions and observations (MayJune 2007) and a time-series (JulyAugust 2003) ofobservational data from "Beacon 2", located toward the western extent of the existing Weipashipping channel (refer Figure 6-3).Three model simulations were performed, with each simulation covering a differentobservational data period. Outer model verification plots of MSQ observed/predicted versussimulated water levels are presented in Figure 6-5 and Figure 6-6. Model verification at theWeipa storm tide gauge (MayJune 2007) and at Beacon 2 (JulyAugust 2003) was generallygood in terms of the magnitude and timing of flood and ebb tide peaks, noting some overpredictionof peak water levels during neap tides. Small discrepancies between the observedand predicted water levels may be attributed to meteorological effects (e.g. atmosphericpressure or local wind effects) which are not typically included in the simulations during modeldevelopment and/or the Outer model boundary conditions not incorporating the minor tidalconstituents.Section 6 Marine Page 6-5
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