2021-10-08 SM - Item 1 - Attachment 1 - Draft Coastal Hazards Adaptation Plan

Figure 4 shows an example of the extent of potential coastal erosion during a major oceanic storm
event, for the year 2100, for a portion of Peregian Beach (adjacent to Peregian Beach Park). Due
to the narrow distances between each erosion extent projection, the results for other years and
locations modelled can be explored in details using Council’s interactive mapping website.




                   Figure 4 - Erosion Prone Area during a 100 ARI marine storm event in 2100


In South-East Queensland, significant erosion on sandy beaches is common after high-energy
wave events such as storms, east coast lows and tropical cyclones. Open sandy beaches such as
Castaways Beach are naturally kept in balance as sand is eroded from the beach and taken
offshore by storms, but is then gradually pushed back onto the beach during calmer conditions.
More frequent and severe storm events coupled with sea level rise make shoreline recession along
much of Noosa Shire’s coastline very likely (State of Queensland, 2011). This means that when
larger storm events occur in future, the area of land above the high-water mark susceptible to the
effects of erosion will increase landward compared to today.


What are tidal inundation and storm tides?
As the sea levels rise, low-lying areas will be exposed to more frequent inundation under everyday
conditions and also with storm tides. In addition to a worsening of inundation in locations that

Noosa Council – Coastal Hazards Adaptation Plan                                                Page 14