Coastal Hazard Assessment · MCU25/0087

SandMap – Report of Survey for Sunshine Beach Profiles




Contents
       Introduction ...................................................................................................................4
       Beach Description ........................................................................................................5
       Personnel ......................................................................................................................6
       Horizontal positioning ..................................................................................................7
                 Horizontal datum............................................................................................................ 7
                 Mapping system ............................................................................................................. 7
                 RTK post processing ..................................................................................................... 8
                 Required precision ........................................................................................................ 8
                 Rejection criteria for position data .............................................................................. 8
       Horizontal control .........................................................................................................8
       Vertical datums .............................................................................................................8
                 Marine datum.................................................................................................................. 8
       Connection to vertical control .....................................................................................8
       7.1       Method used to reduce depths to datum ................................................................................. 9
       Depth measurement .....................................................................................................9
                 Survey vessel ................................................................................................................. 9
                 Single beam echo sounder system (SBES) .............................................................. 10
                 Limiting sea conditions affecting survey quality ..................................................... 10
                 Method used to determine least depths .................................................................... 10
       Seabed coverage ........................................................................................................11
                 Method to ensure seabed coverage criteria is met .................................................. 11
                 Echo sounder pulse repetition rate ........................................................................... 11
                 Beam widths along and across track ........................................................................ 11
                 Survey vessel speed over ground ............................................................................. 11
                 Rejection criteria for line running .............................................................................. 11
       Calibration and quality assurance ............................................................................11
                 Static calibration method ............................................................................................ 11
                 Dynamic calibration ..................................................................................................... 12
                 Bar check ...................................................................................................................... 12
                 Water column sound velocity profile calibrations ................................................... 12
       Sounding reduction and data presentation .............................................................12
                 Methods to reduce raw data to sounding datum...................................................... 12
                 Principle and method used in sounding selection................................................... 12
                 Principle and process for rounding of soundings ................................................... 13



Rev. no.     Doc No.                                         Version Date          Doc Approver
  1          P0100-20251020                                  20/10/2025            Rod Tansley                                Page 2 of 20

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