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Yorkeys Knob Boat Ramp Facility – Investigation Report Yorkeys Knob Boat Ramp Facility – Investigation Report Reference: R.B23406.002.03.Yorkeys.docx Date: May 2019 Confidential Document Control Sheet Document: R.B23406.002.03.Yorkeys.docx BMT Eastern Australia Pty Ltd Level 8, 200 Creek Street Title: Yorkeys Knob Boat Ramp Facility – Brisbane Qld 4000 Investigation Report Australia PO Box 203, Spring Hill 4004 Project Manager: Matthew Barnes Tel: +61 7 3831 6744 Author: Matthew Barnes, Jeremy Visser Fax: + 61 7 3832 3627 Client: Department of Transport and Main Roads ABN 54 010 830 421 Client Contact: Chris Voisey www.bmt.org Client Reference: cn9383-YK Synopsis: Results of environmental and engineering investigations for TMR's proposed Yorkeys Knob boat ramp facility REVISION/CHECKING HISTORY Revision Number Date Checked by Issued by 0 – Existing Environment 15th February MPB JDV 2019 1 – First Draft 15th March 2019 JDV MPB 2 – Final Draft 17th April 2019 JDV MPB 3 - Final 13th May 2019 JDV MPB DISTRIBUTION Destination Revision 0 1 2 3 4 5 6 7 8 9 10 TMR PDF PDF PDF PDF BMT File PDF PDF PDF PDF BMT Library PDF PDF PDF PDF Copyright and non-disclosure notice The contents and layout of this report are subject to copyright owned by BMT Eastern Australia Pty Ltd (BMT EA) save to the extent that copyright has been legally assigned by us to another party or is used by BMT EA under licence. To the extent that we own the copyright in this report, it may not be copied or used without our prior written agreement for any purpose other than the purpose indicated in this report. The methodology (if any) contained in this report is provided to you in confidence and must not be disclosed or copied to third parties without the prior written agreement of BMT EA. Disclosure of that information may constitute an actionable breach of confidence or may otherwise prejudice our commercial interests. Any third party who obtains access to this report by any means will, in any event, be subject to the Third Party Disclaimer set out below. Third Party Disclaimer Any disclosure of this report to a third party is subject to this disclaimer. The report was prepared by BMT EA at the instruction of, and for use by, our client named on this Document Control Sheet. It does not in any way constitute advice to any third party who is able to access it by any means. BMT EA excludes to the fullest extent lawfully permitted all liability whatsoever for any loss or damage howsoever arising from reliance on the contents of this report. G:\Admin\B23406.g.mpb.TMR_Yorkeys&Newell\R.B23406.002.03.Yorkeys.docx Yorkeys Knob Boat Ramp Facility – Investigation Report i Contents Contents 1 Introduction 1 1.1 Purpose 1 1.2 Background 1 2 Technical Studies 4 2.1 Field Investigations 4 2.1.1 Physical Processes 4 2.1.2 Marine Sediment 4 2.1.3 Ecology 5 2.1.3.1 Marine Ecology 5 2.1.3.2 Terrestrial Ecology 5 2.2 Numerical Modelling 6 3 Existing Environment 7 3.1 Coastal Processes 7 3.1.1 Historical Coastal Setting 7 3.1.2 Coastal Dependent Development 7 3.1.2.1 Half Moon Bay Marina 7 3.1.2.2 Bluewater Harbour 9 3.1.2.3 Dredge Areas and Material 9 3.1.2.4 Recently Observed Shoreline Recession at Trinity Park Beach 10 3.2 Metocean Conditions 14 3.2.1 Water Level Statistics 14 3.2.1.1 Tropical Cyclone Water Levels 14 3.2.1.2 Non-Tropical Cyclone Water Levels 14 3.2.1.3 Blending the TC and non-TC Water Level Statistics 16 3.2.2 Wave Statistics 17 3.2.2.1 Tropical Cyclone Waves 18 3.2.2.2 Wave Hindcast 19 3.3 Fluvial Conditions 24 3.4 Environmental Values 26 3.5 Marine Sediment 32 3.6 Regulatory Context 36 4 Concept Layout Assessment 41 4.1 Initial Concept Layout 41 G:\Admin\B23406.g.mpb.TMR_Yorkeys&Newell\R.B23406.002.03.Yorkeys.docx Yorkeys Knob Boat Ramp Facility – Investigation Report ii Contents 4.2 Assessment Approach 41 4.3 Operational Performance Assessments 41 4.3.1 Coastal, 1-yr ARI conditions 41 4.3.2 Fluvial, 2-yr ARI conditions 46 4.4 Design Condition Assessments 47 4.4.1 Coastal, 50-yr ARI conditions 47 4.4.2 Fluvial, 100-yr ARI conditions 50 4.5 Siltation Assessments 52 4.6 Environmental Impacts 55 4.6.1 Marine Impacts 55 4.6.1.1 Construction 55 4.6.1.2 Operation 55 4.6.2 Terrestrial Impacts 59 4.6.2.1 Construction 59 4.6.2.2 Any threatened flora species identified within the project footprint will need to be translocated (where possible), subject to relevant approvals. Operation 60 5 Conclusions and Recommendations 63 6 References 64 Appendix A Marine Studies A-1 Appendix B Terrestrial Ecology B-1 Appendix C Numerical Modelling C-1 Appendix D Database Search Results D-1 List of Figures Figure 1-1 Initial concept layout for proposed Yorkeys Knob boat ramp facility 2 Figure 3-1 Half Moon Bay Existing Development & Key Locations 8 Figure 3-2 Half Moon Bay Dredge Areas and Spoil Ground (from EcoSustainAbility, 2018 Figure 3) 12 Figure 3-3 Shoreline Fluctuations Post Bluewater Harbour Entrance Channel (BMT 2018) 13 Figure 3-4 Observed Residual Tide at Cairns Tidal Station (1984 to 2017) 15 Figure 3-5 Tide-phase imposed water level variability for Cairns: simulated non-cyclonic water level statistics (dark blue); measured and ranked annual maxima (red); 360 re-sampled 32-year periods of tide and residuals (light blue/grey) 16 Figure 3-6 Blended TC and Non-TC tide plus surge extreme water levels for Yorkeys Knob 17 Figure 3-7 Ocean Swell with 9s Peak Period at Clifton Beach (BPA, 1984) 18 Figure 3-8 Half Moon Bay Wave Parameter Timeseries: 11-year Hindcast 20 G:\Admin\B23406.g.mpb.TMR_Yorkeys&Newell\R.B23406.002.03.Yorkeys.docx Yorkeys Knob Boat Ramp Facility – Investigation Report iii Contents Figure 3-9 11-year Hindcast Wave Rose: Cairns Waverider Buoy Location (left) and Half Moon Bay (right) 21 Figure 3-10 Significant Wave Height and Wave Peak Period Scatter Plot 22 Figure 3-11 11-year Hindcast Extreme Value Analysis Significant Wave Height Return Period Plots: non-TC Data (left) and All Data (right) 23 Figure 3-12 2-yr ARI Regional Peak Flood Levels 25 Figure 3-13 50-yr ARI Regional Peak Flood Levels 25 Figure 3-14 100-yr ARI Regional Peak Flood Level 26 Figure 3-15 Vegetation Mapping of the Yorkeys Knob Study Area 28 Figure 3-16 Side-scan Sonar Mosaic of Yorkeys Knob Study Area 29 Figure 3-17 Seagrass Cover and Density in the Yorkeys Knob Study Area 30 Figure 3-18 Macroalgae Cover and Density in the Yorkeys Knob Study Area 31 Figure 3-19 Mapped Habitat (Terrestrial) for Yorkeys Knob Study Area 35 Figure 3-20 Mapped Habitat (Wetlands) for Yorkeys Knob Study Area 37 Figure 3-21 GBR and FHA regulatory areas in Yorkeys Knob study area 38 Figure 4-1 Directional Analysis of 1-yr ARI Significant Wave Height in the Proposed Facility 43 Figure 4-2 1-yr ARI Peak Flood Current: Base Case (left), Developed Case (middle), Impacts (right) 44 Figure 4-3 1-yr ARI Peak Ebb Current: Base Case (left), Developed Case (middle), Impacts (right) 44 Figure 4-4 1-yr ARI Peak Water Level: Base Case (left), Developed Case (middle), Impacts (right) 45 Figure 4-5 1-yr ARI Significant Wave Height: Base Case (left), Developed Case (middle), Impacts (right) 45 Figure 4-6 Developed Case 2-yr ARI Peak Regional Flood Levels 46 Figure 4-7 50-yr ARI Peak Flood Current: Base Case (left), Developed Case (middle), Impacts (right) 48 Figure 4-8 50-yr ARI Peak Ebb Current: Base Case (left), Developed Case (middle), Impacts (right) 48 Figure 4-9 50-yr ARI Peak Water Level: Base Case (left), Developed Case (middle), Impacts (right) 49 Figure 4-10 50-yr ARI Significant Wave Height: Base Case (left), Developed Case (middle), Impacts (right) 49 Figure 4-11 Developed Case 100-yr ARI Peak Regional Flood Levels (top) and Impact Relative to the Base Case (bottom) 51 Figure 4-12 Siltation Assessment Period Wind Rose (left) and Annual Average Wind Rose (right) 52 Figure 4-13 Siltation: Base Case (top), Developed Case (middle) and Impact (bottom) 54 G:\Admin\B23406.g.mpb.TMR_Yorkeys&Newell\R.B23406.002.03.Yorkeys.docx Yorkeys Knob Boat Ramp Facility – Investigation Report iv Contents Figure 4-14 Benthic Habitats within Works Footprint 56 Figure 4-15 Mapped Habitat (Wetlands) within Works Footprint 57 Figure 4-16 GBR and FHA Regulatory Areas within Works Footprint 58 Figure 4-17 Terrestrial Habitats in Works Footprint 61 Figure 4-18 Mapped Habitats (Terrestrial) within Works Footprint 62 Figure A-1 Locations of deployed instruments and bathymetric extent A-2 Figure A-2 Locations of seagrass rake transects A-4 Figure A-3 SAP Sampling Locations A-7 Figure A-4 Bathymetry of Half Moon Creek and boat ramp area A-12 Figure A-5 Side-scan sonar mosaic of the boat ramp area A-14 Figure A-6 Seagrass cover and density in the boat ramp area A-15 Figure A-7 Macroalgal cover and density in the boat ramp area A-16 Figure A-8 Examples of marine benthos: macroalgae resembling Hypnea sp. (A); bryozoans (B); sponge (C); sea urchin (D).
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