2019-12-16 GC Agenda - Item 5 - Attachment 1 - Noosa Spit Shoreline Erosion Management Plan-Part 1

 Noosa Spit SEMP Final Report                                                                iii
 Contents




      4.1    Introduction                                                                    62
      4.2    Overview of Generic Options                                                     62
             4.2.1     Rapid Assessment of Options                                           65
             4.2.1.1   Rapid Assessment Results                                              71
      4.3    Multi-Criteria Analysis                                                         72
             4.3.1     Option 1a: sand plug at either end of Dog Beach                       75
             4.3.2     Option 1b: sand plug at southern end of Dog Beach                     79
             4.3.3     Option 2: extension of the existing groyne at Dog Beach               83
             4.3.4     Option 3: extension of submerged breakwater and two new groynes       87
             4.3.5     Option 4: three new groynes                                           91
             4.3.6     Option 5: shore parallel seawall                                      95
             4.3.7     Option 6: do nothing                                                  97
5     Proposed Implementation Pathway                                                        98
      5.1    Introduction                                                                    98
      5.2    Proposed Trigger-based Management Approach                                      99
      5.3    Legislative Framework & Approvals                                              102
6     References                                                                            103
Appendix A           Metocean Data Collection                                               A-1
Appendix B           Bathymetric Survey (Acoustic Imagery 2019)                             B-1
Appendix C           Proposed Conceptual Options (PCG 2019)                                 C-1
Appendix D           Risk Assessment                                                        D-1

List of Figures
Figure 1-1      Noosa Spit SEMP Study Area                                                     2
Figure 2-1      Artificial Closure of River Channel, 2003 (ICM, 2010a)                         4
Figure 2-2      ICM (2010a) Proposed Ultimate Strategy (top); Stage 1 Works Completed in
                2013 (bottom)                                                                14
Figure 2-3      Dog Beach Shoreline, Pre- and Post-Strategy Implementation                   15
Figure 2-4      Shoreline Recession Measurement Locations                                    17
Figure 2-5      Noosa Spit Width (m)                                                         19
Figure 2-6      Dog Beach Recreational Beach Width                                           20
Figure 2-7      Historical Entrance Configuration Scenarios for Further Assessment: East-
                west Aligned Channel (left) and Northeast-Southeast Aligned Channel          22
Figure 3-1      Wave Model Extents & Data Locations                                          24
Figure 3-2      Hydrodynamic Model Extent & Bathymetry                                       27
Figure 3-3      Hydrodynamic Model Mesh Detail at Noosa Spit                                 28


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