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

Noosa Spit SEMP Final Report                                                                             18
Noosa Spit Shoreline Erosion




                                     Table 2-2     Noosa Spit Width Measurements

                                                                Width (m)
                                                                                                Narrowest
              Year           Point 1             Point 2
                                                                 Point 3          Point 4          part
                            (western             (central
                                                              (central east)   (eastern end)    (between
                              end)                west)
                                                                                               points 3 & 4)
              1982             128                 118                 66          163              57
              1986             170                 129                 68          174              67
              1990             161                 177             219             191              89
              1994             252                 166             210             187              81
              1996             245                 162             208             186              83
              2004             194                 163             212             211              87
              2010              96                 140             189             141              72
              2011              82                 133             185             140              62
              2013              58                 138             182             113              60
              2014              59                 134             178             122              64
              2015              61                 139             181             134              61
              2016              63                 136             176             120              65
              2017              48                 136             181             129              62
              2017              47                 129             181             114              65
              2018              52                 129             178             117              63
              2019              48                 128             178             114              64



        The Spit width measurements indicate that recession is most evident towards the western end.
        Localised narrowing observed at Point 1 is largely attributed to end scour from the training wall and
        rock wall on the southern side of The Spit. Recession appears to occur sporadically and is most likely
        associated with the occurrence of strong river currents during spring tide periods.

        Of more concern is the recession observed at Point 2. Figure 2-5 shows the spit width at each
        measuring location since Stage 1 of the shoreline strategy was implemented, along with the
        associated trend line (dotted) for each location. The measurements confirm that while the southern
        channel was not dominant (i.e. prior to 2017), the shoreline was relatively stable. However, since the
        southern channel became dominant, recession at this location has recommenced. If the southern
        channel remains the dominant channel over the next ten years, recession at Point 2 in the order of
        20 m could be expected.




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