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

Noosa Spit SEMP Final Report                                                                                 19
Noosa Spit Shoreline Erosion




                                          Figure 2-5     Noosa Spit Width (m)


        To provide context for the implications of this recession, in the March 2019 image the vegetated spit
        width at Point 2 is 128 m and of this, approximately 50 m is typically terrestrial (i.e. above highest
        astronomical tide), while the remaining 78 m is mangrove and salt-marsh species routinely inundated
        by higher tides or river flows. Recession of 20 m in this location would nearly halve the terrestrial spit
        width, and further increase vulnerability to breakthrough under storm tide or flood conditions.

        Shoreline movements observed at Point 4 are associated with localised changes due to
        implementation of the Stage 1 shoreline strategy works.

2.4.1.2 Available Recreational Beach Width
        The available recreational beach (i.e. above the high-water mark) on the northern side of The Spit
        was at its widest following nourishment associated with the construction of the training wall (western
        end) and submerged breakwater (eastern end) in 2013. At all other times, the available beach at high
        tide has varied from around 10 m wide to no beach at all.

        Figure 2-6 shows the variability of the width at Dog Beach between the vegetation line and the
        indicative high-water mark at each monitoring line. These approximate distances are reported
        perpendicular to the beach. Points with  symbols indicate that the access to the available beach
        was also affected by fallen trees.

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