Coastal Hazard Assessment · MCU25/0087

                                             17 The Esplanade, Sunshine Beach                              Report




Figure 5-1 ETA 602 location in relation to 17 The Esplanade, Sunshine Beach and Noosa Headland

5.2.2    Short-term Erosion (C)
The Department of Environment and Heritage Protection (2013) recommends the calculation of short-
term erosion based on a 100-year ARI storm event using the method developed by Vellinga (1983).
The equation developed by (Vellinga, 1983) is as follows:
                        .                         .
 7.6              7.6          𝑤     .
     𝑦 = 0.47                            𝑥 + 18       − 2.00
 𝐻                𝐻         0.0268
Where:
𝐻     = Deep water significant wave height (metres)
𝑤 = Fall velocity of sand (metres/second)
𝑥 = The distance from the dune foot (metres)
𝑦 = Depth below storm surge (metres)
The relationship between sediment grain size and fall velocity has been derived from laboratory tests
and is given by the following equation (Vellinga, 1983):
      1
log     = 0.476(log     𝐷) + 2.18 log    𝐷 + 3.19
      𝑤
Where:
𝑤 = Fall velocity of sand (metres/second) in still water of 10oC
𝐷 = The grain size of the sand (metres)




                                                                 252662-MN-RP-CO-0001B | 10 November 2025 | Page 23