2019-09-10 Services & Organisation Committee Agenda

SERVICES & ORGANISATION COMMITTEE MEETING AGENDA                                 10 SEPTEMBER 2019


Table 1: Noosa Spit Shoreline Erosion Management Plan Program

Phase   Description                                                        Status        Expected
                                                                                         Finish
1       Review existing reports and historical imagery; prepare a          Complete           20 Apr
        discussion paper. This will include a review of previous reports
        and historical aerial imagery, with key findings presented in a
        concise discussion paper.
2       Develop a calibrated coastal processes model. A coastal            Complete           14 Jun
        processes model will be developed and calibrated using data
        obtained from a targeted campaign and existing datasets. The
        Model extent will include lower Noosa River estuary and open
        coast areas.
3       Bathymetric survey of Noosa river.                                 Complete            7 Jun
4       Conceptual/numerical modelling of scenarios. The calibrated        Complete            9 Aug
        modelling tools will be used to investigate conceptual (and
        plausible) river entrance configurations and the relationship
        with erosion potential at the Noosa Spit and other points of
        interest within the Noosa River.
5       Develop coastal erosion management strategy. This includes         In Progress        6 Sep
        the development of coastal management strategies aimed at
        reducing the erosive pressure at the Noosa Spit and Doggie
        Beach while maintaining the social and recreational values
        associated with the area and not causing undesirable impacts
        at other locations.
6       Stakeholder engagement workshop in Noosa.                          Upcoming          20 Sep
7       Pre-lodgement style engagement with State regulators               In Progress        27 Sep
        potentially seeking long-term approval for strategy.
8       Final SEMP reporting, including review and consultation            Upcoming           25 Oct
        period.

3.   Modelling Results

The results of the investigation provided the following:
   The geotextile training wall at the western end of the Spit beach has undoubtedly been
     successful in alleviating erosion pressures towards the western end of the beach.
   Recent erosion in the middle of Noosa Spit was worse under the current configuration than
     under any of the other configurations.
   Configurations where there is a well-developed central channel, such as observed in 2010
     or immediately after a large flood event allow greater conveyance of water, with higher high
     tides and lower low tides in the river when compared with the existing condition.
   A Noosa Spit breakthrough would result in high tides being higher along Noosa Sound, in
     the order of 10-15cm during peak spring tides. Further modelling is being undertaken to
     quantify the effect of this change during storm tide events.

4.   Next Steps

The next phase of this project is to develop a coastal management strategy for the Noosa Spit
region that reduces erosion at Noosa Spit, does not adversely impact other regions and aligns
with Noosa values. A long list of potential options was developed by the Noosa Spit project
control group and was refined to a short list of options in consultation with BMT and members of
the Queensland Government’s Department of Environment and Science.




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