MCU25 0087 - Reference Document - Coastal Hazard Assessment (As Published)

                      SandMap – Report of Survey for Sunshine Beach Profiles



                                        Dynamic calibration
                                 Pre and post survey system checks were undertaken at predetermined marks. As the same
                                 GNSS system was being used for survey control checks, these checks were able to prove the
                                 accuracy of the navigation data input.

                                        Bar check
                                 A bar check was carried out on this project. This was carried out in the Noosa River however,
                                 with likely different sound velocity to the ocean area of the survey site. As the bar check is
                                 generally used to adjust SVP values within the SBES to correct the depth/time relationship, in
                                 this case the sound velocity values would be significantly different on site and it was thought
                                 better to conduct SVP dips at the site and adjust values within the SBES controller from those
                                 real time results. This was carried out and the check results against the land based survey
                                 prove the adequacy of this method.

                                        Water column sound velocity profile calibrations
                                 Sound Velocity Profile dips were taken using a SWiFTSVP instrument at the start of the survey
                                 and incorporated into the CEE ECHO SBES prior to the commencement of survey.




                                 Figure 6: Valeport SWiFT SVP

                                 Sounding reduction and data presentation
                                        Methods to reduce raw data to sounding datum
                                 BeamworX software was used to reduce soundings from ellipsoid height to datum by use of
                                 AUSGeoid2020 during acquisition.

                                        Principle and method used in sounding selection
                                 Soundings were mean values. Plans were created for this project from the thinned data.




                      Rev. no.    Doc No.                                        Version Date          Doc Approver
                        1         P0100-20251020                                 20/10/2025            Rod Tansley                        Page 12 of 20

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Document Set ID: 24631530
Version: 1, Version Date: 24/03/2026