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

                      SandMap – Report of Survey for Sunshine Beach Profiles



                                 Seabed coverage
                                        Method to ensure seabed coverage criteria is met
                                 Survey lines were run along pre-determined profiles and met up with land based survey work.
                                 Cross lines were run across the survey as a check.

                                        Echo sounder pulse repetition rate
                                 Ping rate was 20 pings per second at 20m range.

                                        Beam widths along and across track
                                 Beamwidth for the CEE ECHO system was 9° in diameter.

                                        Survey vessel speed over ground
                                 SOG was generally 6 knots on average to maintain good data density and to ensure safe
                                 operation close to the beach.

                                        Rejection criteria for line running
                                 Distance from profile line was set at 2m. Any deviation from this maximum limit was run
                                 again.

                                 Calibration and quality assurance
                                 Equipment was mounted to a fixed bracket and a pole and as such offsets were measured and
                                 incorporated within the software prior to the commencement of this survey. This
                                 arrangement has been used for many surveys in the past.
                                 All results for the checks detailed below can be found in Appendix C: Calibration Checks.

                                        Static calibration method
                                 The Altus NR3 RTK GNSS unit was used to capture the beach profiles out to as deep as possible
                                 at low tide to provide overlap with the single beam acquired data. This overlap effectively
                                 established a small reference surface at each profile for comparison.
                                 Results were very good overall, especially noting the potential for sand movement in the surf
                                 zone area. There was approximately 4 hours between the RTK GNS


                                 S pole shots in the surf and the SBES acquired data due to having to wait for tides.
                                 Results detailed at Appendix C: Calibration Checks.




                      Rev. no.    Doc No.                                        Version Date          Doc Approver
                        1         P0100-20251020                                 20/10/2025            Rod Tansley                        Page 11 of 20

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