Coastal Hazard Assessment · MCU25/0087

                                                          17 The Esplanade, Sunshine Beach                              Report


Table 5-2 Design Storm Events for Short-term Beach Erosion Assessment
 Storm Component                          Storm Event 100-year ARI
 Significant Wave Height                           6.2m
 Storm Tide                                     1.74m AHD
 Sea Level Rise                                      -

An assessment of the short-term erosion associated with the event presented in Table 5-2 was
undertaken for the surveyed beach profiles shown in Figure 2-12. The survey data was
supplemented with a Digital Elevation Model (ELVIS, 2024) for the stable high dune areas.
The profiles for the assessment have been labelled Sections A-A (500m south of the site), B-B (the
site) and C-C (500m north of the site) refer Figure 5-3.
The storm erosion profile has been derived from Vellinga (1983) based on the design wave and water
level presented in Table 5-2. The short-term erosion distance has been measured horizontally from
the current toe of the frontal dune to the base of the predicted erosion scarp. As discussed above in
Section 2.3.1 the current toe of frontal dune is 2.3m AHD which is higher than the design water level
1.74m AHD.
The average of the short-term erosion values for Sections A-A, B-B (the site), and C-C provides a
representative short-term erosion value for this compartment spanning 1km of Sunshine Beach.
Table 5-3 presents the predicted short-term erosion associated with the 100-year ARI design storm
event for the three profiles. This shows an average storm erosion cut of 17m is predicted to occur for
this section of Sunshine Beach. The storm cut profile for the three beach profile sections are shown in
Figure 5-4 (Section A-A), Figure 5-5 (Section B-B) and Figure 5-6 (Section C-C).




                           Figure 5-3 Plant view of the 3 sections – 17 The Esplanade study area.


Table 5-3 Predicted Short-Term Erosion-Sunshine Coast
 Profile                         Short- Term
                                 Erosion (m)
 Section A-A                         23
 Section B-B (the site)              8
 Section C-C                         20
 Average                             17




                                                                              252662-MN-RP-CO-0001B | 10 November 2025 | Page 25